Reference book not to be taken from the library. · 2017. 11. 30. · CRPL-F16S PART B . FOR...

CRPL-F16S PART B FOR OFFICIAL USE

ional Bureau of Standards Library, N.ff. Blag

JUN 1 7 195$

Reference book not to be taken from the library.

PART B

SOLAR - GEOPHYSICAL DATA

ISSUED MAY 1958

U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS

CENTRAL RADIO PROPAGATION LABORATORY BOULDER, COLORADO

CRPL-F165

PART B

NATIONAL BUREAU OF STANDARDS Issued CENTRAL RADIO PROPAGATION LABORATORY 3lMay 1958

BOULDER, COLORADO

SOLAR-GEOPHYSICAL DATA

CONTENTS

INTRODUCTION

Description of Tables and Graphs

I DAILY SOLAR INDICES

(a) Relative Sunspot Numbers and 2800 He Solar Flux (b) Graph of Sunspot Cycle

II SOLAR CENTERS OF ACTIVITY

(a) Calcium Plage and Sunspot Regions (b,c) Coronal Line Emission Indices (Addenda to previously

published monthly reports. April data will appear in next issue.)

III SOLAR FLARES

(a-jl Uptical Observations (k) Flare Patrol Observations (l,m) Subflares (n,o) Ionospheric Effects

IV SOLAR RADIO WAVES

(a,b) 2800 Me — Outstanding Occurrences (Ottawa) (c) 200 Me — Daily Data (Cornell) April 1958 (d) 200 Me — Outstanding Occurrences (Cornell) April 1958 (e) 167 Me — Daily Data (Boulder) March 1958 (f,g) 167 Me — Outstanding Occurrences (Boulder) March 1958 (h) 470 Me — Daily Data (Boulder) March 1958 (i) 470 Me — Outstanding Occurrences (Boulder) March 1958

V GEOMAGNETIC ACTIVITY INDICES

(a) C, Kp, Ap, and Selected Quiet and Disturbed Days (b) Charts of Kp by Solar Rotations

VI RADIO PROPAGATION QUALITY INDICES

North Atlantic: (a) CRPL Quality Figures and Forecasts (b) Graphs Comparing Forecast and Observed Quality (c,d) Graphs of Useful Frequency Ranges North Pacific: (e) CRPL Quality Figures and Forecasts (f) Graphs Comparing Forecast and Observed Quality

VII ALERT PERIODS AND SPECIAL WORLD INTERVALS

(a) IGY world Warning Agency Decisions for Alerts and SWI

I1YTR0DUCT ION

The descriptive text is published quarterly or whenever context of the report is changed. The last issue in which the text appeared was CRPL-F164 Part B issued April 195B.

DAILY SOLAR INDICES

Apr. 1958

Zurich Provisional Relative Sunspot

Numbers

RZ

Daily Values Solar Flux at 2800 Me, Ottawa, Canada

Flux

1 290 331 2 292 326 3 245 302 4 245 295 5 244 290

6 212 289 7 246 283 8 246 272 9 204 250

10 197 244

11 159 216 12 140 196

13 127 179 14 96 177

15 99 188

16 108 197

17 147 207 18 168 213

19 191 221 20 192 226

21 218 229 22 212 237 ; 23 201 235 24 181 244 25 206 248

26 182 245 27 190 247 28 198 258 29 207 255 30 208 265

Mean: 195.0 245.5

Mar. 1958

American Relative Sunspot Numbers

rA'

1 120 2 114

3 159 4 186

5 214

6 212

7 145 8 182

9 173 10 171

11 162 12 163

13 166 14 200

15 166

16 169

17 171 18 151

19 168 20 144

21 160 22 166 23 191 24 208 25 189

26 233 27 243 28 237 29 287 30 278 31 268

Mean: 187.0

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CMP Area

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01.7 N26 4492 4443 400 2 £ — £ 3 01.8 NO 6 4487 New 700 3 b / l 1 360 6 b f- £ 02.4 S14 4480 New* 5500 3 £ - £ 1 1160 10 £—^£ 02.9 N25 4481 4443 1700 3 £ — £ 3 390 1 £ — £ 04.6 N32 4484 4444 9000 3 £ — £ 2 860 14 £ \ £

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08.1 S24 4494 4458 1000 2 £ £ 2 (230) (5) £ A d 08.9 S12 4496 4458 800 2 £ r £ 2 50 2 b — d 09.8 N17 4493 * * 8500 3 £ — £ 2 1270 8 £ A £ 11.5 N44 4495 4464 3000 3 £s— £ 2 (90) (2) £— d 12.8 S16 4497 New 1500 2.5 £-J- £ 1 50 4 bV~£

13.5 N45 4503 New 700 1.5 b — d 1 13.9 N12 4498 4456 4800 3.5 £ V £ 2 20 2 £ ma a 14 5 SO 8 4500 4472 800 1.5 £ \ d 2 15.8 S05 4501 New 500 1.5 £ — £ 1 60 4 £ — d 15.9 S15 4504 4459 400 1.5 £ —£ 4 90 4 b —d

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INTERVALS OF NO FLARE PATROL OBSERVATIONS APRIL 1958

11 Ik

HOUR-UT

I 2 3 4 5 6 7 8 9 10 I I 12 13 14 15 16 17 18

Stations included:

19 20 21 22 23 24

COMMERCE - STANDARDS - BOULDER

acapri (Swedish)

cetri

eenwich Royal Observatory,

Herstmonceux

Hawa i i

Huancayo

Kodaikana1

McMath-Hulbert

Mitaka

Nizamiah

Ottawa

Royal Observatory,

Edinburgh

Sacramento Peak

Uccle

U. S. Naval Research Laboratory

Zurich

III1

SUBFLARES NOTED AS FOLLOWS* DATE - UN

MARCH 1958

ATHENS 01 0720 S15 E 78 ATHENS

ATHENS 01 0729 S13 W51 ♦NIZAMIAH

WENDEL 01 1021 E S12 W49 USNRL

WENDEL 01 1225 E Sll W49 USNRL

WENDEL 01 1228 E S16 E 86 USNRL

CAPRI S 01 1240 E S12 W 52 USNRL

★WENDEL 01 1344 E S16 E 76 SAC PEAK

USNRL 01 1426 S23 WO 5 USNRL

HAWAII 01 2236 S17 W 56 SAC PEAK

SAC PEAK

USNRL 02 1326 S21 E 70 SAC PEAK

CLIMAX 02 1959 S28 E 70 SAC PEAK

CLIMAX

USNRL 03 1414 S22 E 55 SAC PEAK

USNRL 03 1506 S24 W32 HAWAII

CLIMAX 03 1605 S18 E46 HAWAII

CLIMAX 03 1630 S17 E50 HAWAII

USNRL 03 1632 S17 E 52 CLIMAX

USNRL 03 1659 S25 W32 * SAC PEAK

* USNRL 03 1810 S 22 E 69 * SAC PEAK

USNRL 03 1823 N33 W39 CLIMAX

USNRL 03 1842 S18 E43 HAWAII

USNRL 03 1905 N34 W39

USNRL 03 1923 S12 W28 ONDREJOV

USNRL 03 1942 S22 W36 WENDEL HAWAII 03 2100 S14 E52 * WENDEL

USNRL

USNRL 04 1300 S24 W44 USNRL

*CAPRI S 04 1320 E S26 W44 *USNRL

USNRL 04 1409 N35 W 50 SAC PEAK

WENDEL 04 1452 E N20 E52 OTTAWA

USNRL 04 1520 N35 E20 SAC PEAK

WENDEL 04 1527 E N20 E52 OTTAWA

USNRL 04 1536 N15 E 90 SAC PEAK

USNRL 04 1552 S18 E26 SAC PEAK

USNRL 04 1553 N25 E 20 SAC PEAK

WENDEL 04 1605 E SlO W4O HAWAII

WENDEL 04 1605 E S18 E35 SAC PEAK

USNRL 04 1605 S09 W43 HAWAII

USNRL 04 1606 S21 E35

*CLIMAX 04 1715 S14 E42 ATHENS

USNRL 04 1745 N33 W52 * SAC PEAK

SAC PEAK AROSA 05 0858 S18 E29 SAC PEAK

♦CAPRI S 05 1004 E S21 E28 SAC PEAK

ONDREJOV 05 1137 E S13 W49 OTTAWA

WENDEL 05 1227 E S18 E30 USNRL

*CAPRI S 05 1315 E S17 E 2 7 SAC PEAK

USNRL 05 1458 E S19 E26 CLIMAX

CLIMAX 05 1526 S13 E30 OTTAWA

OTTAWA 05 1529 S13 E29 USNRL

SAC PEAR 05 1610 E S13 W50 CLIMAX

OTTAWA 05 1614 S17 E31 SAC PEAK

* SAC PEAK 05 1625 S13 E29 SAC PEAK

SAC PEAK 05 1640 S12 W 5 1 CLIMAX

*ottawa 05 1640 E S20 E25 USNRL

*ottawa 05 1647 E N28 W65 SAC PEAK

SAC PEAK 05 1712 S13 E33 CLIMAX

*CLIMAX 05 1720 S15 E29 USNRL

SAC PEAK 05 1735 S21 E26 USNRL

CLIMAX 05 1739 S25 E60 CLIMAX

OTTAWA 05 1740 E S15 E24 *HAWAII

USNRL 05 1741 E S17 E23 * USNRL

SAC PEAK 05 1742 N28 W 64 USNRL

CLIMAX 05 1753 SO 8 W57 HAWAII

SAC PEAK 05 1817 N25 E04 USNRL

SAC PEAK 05 1830 S25 E25 HAWAII

SAC PEAK 05 1837 S16 E25 USNRL

*SAC PEAK 05 1902 E S06 W 57 USNRL

UCCLE 06 1023 E SlO W65 ATHENS

* CLIMAX 06 1537 S20 E12 ATHENS

USNRL 06 1658 E S12 W67 ATHENS

CL IMAX 06 1755 S21 Ell ATHENS

CLIMAX 06 1808 S22 Ell UCCLE

USNRL 06 1816 E S22 Ell UCCLE

USNRL 06 1834 E N25 WO 8 USNRL CLIMAX 06 1842 S18 E12 USNRL

USNRL 06 1843 E SI 7 E10 USNRL

USNRL 06 1921 N25 WO 2 USNRL

USNRL 06 2047 E S18 E08

USNRL 06 2059 N32 W90 ATHENS

USNRL 06 2104 E S16 E09 UCCLE USNRL

USNRL 07 1239 E N32 W04 USNRL

USNRL 07 1242 SlO W 78 USNRL *ottawa 07 1329 S18 EOO USNRL

USNRL 07 1415 N26 W21 USNRL

USNRL 07 1447 N31 W06 USNRL

USNRL 07 1628 N32 WO 8 USNRL OTTAWA 07 1628 N32 WO 8 USNRL


USNRL 07 1633 S20 WO 2 USNRL


USNRL 07 1712 N32 wio USNRL

USNRL 07 1735 S14 W 8 1 USNRL

USNRL 07 1740 N31 wio

OTTAWA 07 1756 S16 W80 NIZAMIAH

USNRL 07 1757 S14 W82 OTTAWA

USNRL 07 1854 N24 W22 SAC PEAK

*USNRL 07 1942 'SIS W82 HAWAII

USNRL 07 2010 N24 W26

USNRL 07 2022 N25 W22 ONDREJOV

*USNRL 07 2032 S13 W82 ONDREJOV

L TIME - COORDINATES

0738 S18 W18 UCCLE 15 0806 N12 W25 1050 S22 W14 UCCLE 15 0813 N12 W28 1233 E S16 W12 ★WENDEL 15 0835 E N12 W25 1340 N31 W13 UCCLE 15 1215 N37 E 58

1425 S12 W90 UCCLE 15 1219 N33 E63

1449 E S22 W 14 UCCLE 15 1234 N12 W25

1615 N10 E55 *USNRL 15 1343 N12 W27 1617 N09 E 55 USNRL 15 1408 Nil W29

1702 N34 W19 USNRL 15 1516 N12 W28 1740 N26 W34 SAC PEAK 15 1537 N22 W90

1757 N27 W33 SAC PEAK 15 1540 N12 WO 6 1800 N10 E 56 ★USNRL 15 1541 N12 W30

1810 E Nil E54 USNRL 15 1557 N22 W90

1855 S14 W90 SAC PEAK 15 1607 N38 E53 2114 N36 W18 UCCLE 15 1609 N13 W33

2138 E N12 E 52 SAC PEAK 15 1717 N13 W29

2200 N36 W18 SAC PEAK 15 1805 N13 W30

2200 N34 W19 SAC PEAK 15 1807 N 22 W90

2200 N08 E 51 SAC PEAK 15 1907 NlO E 38

2247 N09 E 5 2 SAC PEAK 15 1915 N13 W30

2248 N34 W19 SAC PEAK 15 1935 N13 W30

2248 N36 W18 SAC PEAK 15 2012 N13 W30

SAC PEAK 15 2110 N13 W30

1154 N10 E41 HAWAII 15 2112 N12 W31

1200 E NlO E41 SAC PEAK 15 2112 SO 6 E88 1220 E N10 E45 SAC PEAK 15 2150 N12 W 31 1230 N35 W28 HAWAII 15 2152 E NlO W 32 1316 N35 W25 SAC PEAK 15 2210 N13 W31 1455 E S17 W35 HAWAII 15 2212 N12 W 31

1455 N21 W57 SAC PEAK 15 2255 N42 E35 1516 Nil E 39

1717 S14 W27 UCCLE 16 0825 N15 E20

1718 S15 W26 UCCLE 16 1110 NO 8 E30

1805 N32 W36 USNRL 16 1305 Nil W45 1857 NlO E38 USNRL 16 1310 N12 E 24 1940 S15 W 32 USNRL 16 1346 N12 E24

2004 N15 E40 * USNRL 16 1350 N13 E25 2102 S19 W39 * WENDEL 16 1358 E N12 E 24

2352 N19 E23 USNRL 16 1402 E Nil E 24

USNRL 16 1409 N16 W42 0715 N15 E46 USNRL 16 1517 E N15 E25 1421 E N35 W40 USNRL 16 1543 E N14 W42

1452 S22 W 32 USNRL 16 1602 N09 W53

1522 N34 W45 USNRL 16 1603 N14 E25 1540 N34 W45 USNRL 16 1624 N14 E25

1540 N32 W42

1619 N17 E 18 UCCLE 17 0852 E N40 E54 1632 N35 W45 * USNRL 17 1216 N36 E35 1634 N34 W44 USNRL 17 1315 N22 E 70

1635 N32 W43 CAPRI S 17 1317 E N25 E71

1723 N17 E 38 UCCLE 17 1515 E N13 Ell

1727 *15 E38 UCCLE 17 1515 E N15 E09

1727 U N17 E 37 UCCLE 17 1515 E NlO E15

1730 N32 W44 UCCLE 17 1539 N14 E87

1734 N36 W43 USNRL 17 1807 N22 E66 1735 N34 W42 USNRL 17 1958 N12 W 84

1742 N25 W 25

1743 N23 W24 WENDEL 18 0909 E N22 E 63

1745 N25 W25 UCCLE 18 1118 N14 W01

1825 N13 E 39 WENDEL 18 1300 E N22 E52

1825 N14 E39 SAC PEAK 18 1857 N27 W70

1956 N36 W50 SAC PEAK 18 2205 NlO W90

1956 N35 W44 SAC PEAK 18 2312 N27 W79

2023 S12 W48 SAC PEAK 18 2325 NlO W90

2032 N18 E33

2034 N15 E35 R 0 HERST 19 1115 E N12 W 13

2038 N20 EO 8 SAC PEAK 19 1512 N21 E55

2038 N17 E12 SAC PEAK 19 1545 N22 E41

2057 S17 W52 SAC PEAK 19 1647 N23 E 36

SAC PEAK 19 2238 U N46 W 88 0702 E N30 W55

0725 N09 E15 ♦ATHENS 20 •0700 E N27 E58

0740 N16 E33 ONDREJOV 20 0 759 E N21 E28

0804 N34 W50 ONDREJOV 20 0830 E N22 E32

0833 E N14 E29 UCCLE 20 1108 N20 W35

0839 S20 W58 MEUDON 20 1136 N25 E25

1345 Nil E23 MEUDON 20 1143 NO 8 E45

1349 NlO E15 SAC PEAK 20 1405 N13 W32

1411 N23 W 36 SAC PEAK 20 1700 N48 W90

2100 E N24 W37 SAC PEAK 20 1700 N22 E26

SAC PEAK 20 2040 N16 W34

0831 E N18 E 70

1007 Sll W70 ATHENS 21 0717 N24 E17

1441 N14 E14 UCCLE 21 0856 N19 E17

1451 N12 E90 UCCLE 21 1041 E N22 E18

1512 N24 W49 * MEUDON 21 1411 N22 E15

1542 S20 W70 * SAC PEAK 21 1411 E N22 E13

1552 N14 E14 SAC PEAK 21 1522 N21 E15

1611 E N14 E13 CAPRI S 21 1527 E N23 E14

1637 N14 E12 UCCLE 21 1553 N23 E20

1637 S21 W59 SAC PEAK 21 1612 S16 E90

1701 N12 E90 SAC PEAK 21 1721 E S14 E90

1703 N12 E90 SAC PEAK 21 1802 N21 E12 1830 N12 Ell SAC PEAK 21 1830 U S15 E90

1831 N14 E12, * USNRL 21 1920 E N22 E 13

2029 N15 Ell SAC PEAK 21 2317 U N19 W 55

SAC PEAK 21 2347 E S12 E 90

0 344 NlO EO 7

1310 N15 WO 2 NIZAMIAH 22 0541 N17 E61

1620 N14 WO 5 MEUDON 22 1057 N08 E64

2022 N14 WO 2 MEUDON 22 1057 S05 E 71

♦CAPRI S 22 1129 E N23 EO 6 0719 E S 13 W30 USNRL 22 1335 E S24 E 90

1237 E N23 W70 USNRL 22 1351 N18 W63

COMMERCE - STANOAROS - 80ULDER

lIVERSAI

08

08

08

08

08 08 08

08

08

08

08 08

08

08

08

08

08

08

08

08

08

08

09

09 09

09

09

09

09

09

09

09

09

09

09

09

09

09

10 10 10

10 10 10 10 10 10 10

10 10

10

10

10

10

10 10

10

10 10

10

10

10

10 10 10 10 10

11 11 11 11 11 11 11 11 11 11

12 12 12 12 12 12 12 12 12 12 12 12 12 12 12

13

13

13

13

14 14

*Rated as flare of importance > 1 by other observatories (See CRPL-F 164 Part .

Illm

SUBFLARES NOTED AS FOLLOWS#

USNRL 22 1624 N25 E22 ★SAC PEAK

★USNRL

UCCLE 23 0908 S20 E 87 SAC PEAK

WENDEL 23 1101 E sn E70 USNRL

USNRL 23 1228 N22 W 13 USNRL

SAC PEAK 23 1355 D S12 E90 USNRL

SAC PEAK 23 1457 N25 W04 USNRL

USNRL 23 1458 N26 WO 6 SAC PEAK

USNRL 23 1501 N24 E05 OTTAWA

USNRL 23 1513 N26 WO 6 SAC PEAK

SAC PEAK 23 1655 N15 E41 OTTAWA

SAC PEAK 23 1715 N23 E04 SAC PEAK

HAWAII 23 1830 N25 E01 SAC PEAK

SAC PEAK 23 1951 E S22 E90 SAC PEAK



SAC PEAK 23 2335 N25 W23 AROSA

*ATHENS 24 0645 N20 W24 AROSA

ATHENS 24 0650 E N37 W53 WENDEL

UCCLE 24 0830 N08 W&9 MEUDON

WENDEL 24 0851 E N19 W29 WENDEL

*WENDEL 24 0918 E S17 E64 UCCLE

WENDEL 24 1013 E N19 W26 UCCLE

WENDEL 24 1130 E N25 wii WENDEL

USNRL 24 1210 E N20 W30 *MEUDON

* USNRL 24 1235 N20 W29 *WENDEL

* UCCL E 24 1310 N20 W30 UCCLE

UCCLE 24 1406 S22 E 79 UCCLE

WENDEL 24 1433 E N19 W26 WENDEL

UCCLE 24 1436 N20 W30 *ottawa

HAWAII 24 2302 N19 E23 *R 0 HERST

OTTAWA

NIZAMIAH 25 0257 E N20 W35 ★USNRL

WENDEL 25 0744 E N21 W31 ★USNRL

WENDEL 25 0919 E N25 WO 5 SAC PEAK

ONDREJOV 25 0944 S24 E60 ★SAC PEAK

UCCLE 25 1043 E N27 W 31 ★USNRL

UCCLE 25 1044 N29 WO 6 ★SAC PEAK

UCCLE 25 1044 N25 W12 ONDRE JOV

UCCLE 25 1058 S09 E50 SAC PEAK

*WENDEL 25 1124 E S23 E61 ★SAC PEAK

WENDEL 25 1249 E S22 E63 ★SAC PEAK


UCCLE 25 1333 E S15 E 51 SAC PEAK


SAC PEAK 25 1932 E S18 E46 USNRL

SAC PEAK 25 2335 S22 E61 SAC PEAK

SAC PEAK

OTTAWA 26 1415 SO 6 E09 USNRL

OTTAWA 26 1421 N18 W 54 SAC PEAK

OTTAWA 26 1535 SO 8 £07 SAC PEAK

SAC PEAK 26 2305 SO 7 EQ2 USNRL

HAWAII 26 2308 SO 8 E03 SAC PEAK

SAC PEAK

AROSA 27 0820 N22 W67 SAC PEAK

ZURICH 27 0820 E N23 W54 SAC PEAK

ZURICH' 27 0820 E N22 W62 SAC PEAK


WENDEL 27 0834 E N24 W55 SAC PEAK

UCCLE 27 0835 N23 W68

UCCLE 27 0835 N25 W60 WENDEL

UCCLE 27 0906 S25 E45 * UCCLE

*UCCLE 27 0908 S28 E36 WENDEL

UCCLE 27 0944 E S16 E 36 WENDEL

UCCLE 27 1029 E N25 W46 WENDEL UCCLE 27 1106 S16 E25 WENDEL UCCLE 27 1106 S20 E33 ZURICH

UCCLE 27 1110 S16 E83 UCCLE OTTAWA 27 1249 S24 W41 ZURICH

WENDEL 27 1316 E S24 E40 ZURICH

OTTAWA 27 1319 S23 E39 WENDEL OTTAWA 27 1322 S16 E34 ★ WENDEL

WENDEL 27 1324 E S14 E19 WENDEL

SAC PEAK 27 1402 S19 E80 WENDEL

SAC PEAK 27 1402 N25 W76 OTTAWA

SAC PEAK 27 1410 S 16 E23 SAC PEAK OTTAWA 27 1410 S15 E22 SAC PEAK

ONDREJOV 27 1411 S18 E22 WENDEL ★OTTAWA 27 1414 N23 W67 OTTAWA

★OTTAWA 27 1505 S24 E37 OTTAWA

★SAC PEAK 27 1505 S24 E39 * SAC PEAK

★SAC PEAK 27 1505 S30 E 29 * WENDEL ★OTTAWA 27 1506 S27 E30 * WENDEL

SAC PEAK 27 1632 N24 W75 ★ SAC PEAK

SAC PtAK 27 1700 N24 W62 WENDEL

★SAC PEAK 27 1700 S25 E 38 SAC PEAK

SAC PEAK 27 1705 S28 E 25 OTTAWA

SAC PEAK 27 1747 N25 W42 OTTAWA OTTAWA 27 2008 SO 6 woi WENDEL SAC PEAK 27 2027 N25 W79 SAC PEAK SAC PEAK 27 2302 S25 E34 * SAC PEAK

SAC PEAK 27 2407 N35 E 90 UCCLE OTTAWA


ATHENS 28 0727 N23 W62 WENDEL

*WENDEL 28 0843 E S23 E 24 OTTAWA

WENDEL 28 0843 E S24 E 31 OTTAWA

WENDEL 28 0848 E N24 W38 SAC PEAK

UCCLE 28 0952 E S16 E17 SAC PEAK

WENDEL 28 0955 E S14 E14 SAC PEAK

*USNRL 28 1305 N36 E 90 OTTAWA

USNRL 28 1317 N27 W 89 OTTAWA

UCCLE 28 1406 E S16 E 75 SAC PEAK

UNIVERSAL TIME - COORDINATES

1958

1427 N22 W88 SAC PEAK 30 1770 S24 WOl 1429 N22 W90 SAC PEAK 30 1727 N35 E64 1450 N22 W89 SAC PEAK 30 1805 SO 7 W18 1452 N21 W90 SAC PEAK 30 1827 N37 E63 1512 N28 W90 SAC PEAK 30 1857 N16 W54 1604 N20 W90 SAC PEAK 30 1907 N35 E60 1645 N27 W90 * SAC PEAK 30 2032 SO 7 W19 1947 N28 W90 SAC PEAK 30 2100 SO 7 W19

2024 N24 W60 * SAC PEAK 30 2155 N36 E60

2028 E N26 W60

2124 S24 E13 CAPRI S 31 0800 E S14 W30

2150 E SO 8 E02 * CAPRI S 31 0859 S20 E28 2217 SO 7 W17 ★NIZAMIAH 31 1025 E sio W27 2222 N28 W62 UCCLE 31 1112 E S19 E 2 8

2247 N24 W90 UCCLE 31 1112 E SO 8 W26

2327 SO 7 EO 6 UCCLE 31 1112 E N37 E52

UCCLE 31 1144 N22 E66

0657 N23 W 90 UCCLE 31 f208 N23 W 66

0657 S15 woi UCCLE 31 1213 SO 8 W 64

0659 E N23 W48 UCCLE 31 1213 S22 W90 0738 N23 W63 OTTAWA 31 1215 E SOS W57 0803 E N26 W63 OTTAWA 31 1220 SO 7 W29 0906 E N27 W70 OTTAWA 31 1221 S15 W29 0906 E S18 WO 2 UCCLE 31 1224 S15 W32 0959 E SO 8 WO 3 UCCLE 31 1237 NO 7 E18 1031 S06 EO 5 OTTAWA 31 1243 S14 W38 1044 E N26 E66 UCCLE 31 1244 S14 W4O 1114 S22 W35 UCCLE 31 1248 S15 E25 1131 SOS WO 8 UCCLE 31 1255 SO 8 W40 1218 E S22 E09 UCCLE 31 1255 E SO 5 W32 1223 E S22 E15 OTTAWA 31 1255 SO 7 W29 1226 E S23 E16 UCCLE 31 1326 N20 W45 1314 SO 8 WO 8 UCCLE 31 1333 N34 E54 1341 N36 E 80 UCCLE 31 1341 SO 6 W63 1353 S17 E 90 UCCLE 31 1349 S13 W39 1401 E N35 E 80 OTTAWA 31 1349 S14 W37

1405 S15 E57 OTTAWA 31 1357 S14 W31 1407 S14 E60 SAC PEAK 31 1410 E S20 E25 1432 S17 W06 SAC PEAK 31 1410 S13 W34 1441 E S10 WO 3 UCCLE 31 1416 S19 E26 1447 SO 8 W12 ★SAC PEAK 31 1442 SO 6 W65 1447 N27 W70 UCCLE 31 1444 SO 9 W31 1505 S08 W12 SAC PEAK 31 1445 SO 8 W 31 1507 N19 W90 SAC PEAK 31 1447 N38 E 50 1545 N20 W90 UCCLE 31 1448 N38 E50 1545 S18 E 85 SAC PEAK 31 1517 SO 9 W69 1548 N20 W90 ♦SAC PEAK 31 1522 S12 W41 1622 N22 E90 ★OTTAWA 31 1523 E S12 W65 1630 N21 W 90 UCCLE 31 1523 SO 9 W70 1631 N20 W90 OTTAWA 31 1528 E S14 W39 1642 N20 W90 OTTAWA 31 1533 Sll W4O 1652 S18 E 80 UCCLE 31 1534 SIO W42 1655 E S16 E 79 UCCLE 31 1534 SO 9 W70

1710 N32 E90 UCCLE 31 1551 N05 E15 1750 SO 5 W33 UCCLE 31 1555 S15 E20

1820 N35 E 89 UCCLE 31 1601 S18 W 3 1

2002 N33 E 89 SAC PEAK 31 1645 S13 W41

2135 S24 EOO SAC PEAK 31 1727 S12 W34 2320 N24 W88 SAC PEAK 31 1740 N36 E54

2340 SO 7 Wll SAC PEAK 31 1750 S12 W42 SAC PEAK 31 1757 N20 E56

0806 E N34 E 69 SAC PEAK 31 1802 SO 6 W58

0822 S15 W 15 SAC PEAK 31 1322 S12 W43

0902 E N33 E64 SAC PEAK 31 1900 SO 5 W62

0932 E S22 W05 SAC PEAK 31 1910 S12 W43

0940 E N23 W65 SAC PEAK 31 2002 SO 8 W35

0953 E S07 W12 0954 S06 W09 COMMERCE — STANDARDS - BOULDER

1000 S22 WO5

1032 S14 W14

1036 SO8 W14

1044 E N33 E63

1115 E S24 E04

1129 E N33 E63

1205 E N34 E66

1332 SO5 W15

1402 N35 E66 1402 S15 W16

1406 E N33 E62 1410 S14 W16

1411 N36 E61

1422 SO7 W17

1423 E SO8 W16

1454 E S20 W07 1455 S19 WO7

1456 E N33 E62

1457 N35 E61

1501 S19 W07

1504 N37 E62

1514 E S20 WO7

1532 N34 E62 1537 N34 E60

1539 N24 E88

1545 *36 E59

1557 S08 W18

1559 E S08 W16

1605 E SO6 W42

1605 E SO9 W17

1615 N36 E60

1645 S14 W21

1650 N35 E60

1654 E N37 E62

1654 E S13 W19

1715 N26 W90

DATE -

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11 In

IONOSPHERIC EFFECTS OF SOLAR FLARES

(SHORT-WAVE RADIO FADEOUTS)

MARCH 1958

Start End Type Wide Impor- Observation Stations Known

Mar. UT UI Spread tance Flare, UT

1958 Index CRPL-F 164B

1 0120 0154 Slow S-SWF 3 1+ AN, OK ★

1 0340 0515 Slow S-SWF 5 3 AD, KO, OK, SY, TO, CW+

1 0913 0925 S-SWF 4 2+ JU, KO, NE, CW**, CW*** 0911 1 0929 0959 S-SWF 4 2 JU, KO, NE, CW** 0925 1 1649 1725 S-SWF 5 2+ BE, HU, MC, NE, PR, WS ★

3 1010 1145 S-SWF 5 3+ MA, NE, PU, SW, TO, CW$** 1008E 6 0737 0758 S-SWF 4 2 KO, NE, PU

7 1047 1130 S-SWF 3 2 NE, CW** 1030 8 1326 1355 S-SWF 5 2 BE, HU, MC, NE, PR, WS

8 1620 1635 Slow S-SWF 3 1- BE, MC, PR

8 1723 1740 S-SWF 5 2+ BE, CR, HU, MC, PR, WS 1720 8 1805 1825 S-SWF 5 1+ BE, CR, HU, MC, PR, WS

8 1900 1925 Slow S-SWF 4 1+ BE, CR, MC, PR, WS

8 2102 2130 Slow S-SWF 4 2 AN, BE, HU, MC, PR, WS

9 0128 0156 S-SWF 3 1+ AD, OK

9 0211 0306 G- SWF 3 1+ AD, OK 0210E 9 1141 1159 Slow S-SWF 3 2 NE, PU 1145E 9 1542 1703 S-SWF 5 3 BE, CR, HU, MA, MC, NE, PR, PU, WS, CW** 1540 9 1900 1920 Slow S-SWF 4 1 BE, CR, HU, MC, PR, WS 9 2003 2030 S-SWF 5 2+ AN, BE, CR, HU, MC, PR, TO, WS 1957

10 0205 0314 G-SWF 3 2 OK, TO 0208 10 0400 0500 G-SWF 1 2 OK

10 0708 0730 Slow S-SWF 5 2+ JU, OK, CW+, CW** 0709E 10 1319 1401 G-SWF 5 2 MC, PR, PU 1316E 10 1412 1429 S-SWF 4 1+ PR, PU 1408

10 1717 1810 G-SWF 3 1 MC, PR, WS 1710 10 2025 2055 G-SWF 4 1 AD, MC, PR, WS 2024 11 0048 0320 S-SWF 3 3 AN, OK 0030E 11 1510 1800 Slow S-SWF 5 3 BE, CR, HU, MC, PR, WS, CW*

12 0052 0439 G-SWF 1 3+ OK 0043E

12 1430 1520 Slow-S-SWF 5 2+ BE, CR, HU, MA, MC, NE, PR, WS, CW***, RCA* 1436E 14 1455 1705 Slow-S-SWF 5 3 BE, CR, HU, MA, MC, NE, PR, SW, WS, CW S* 1504E 15 1538 1556 Slow-S-SWF 5 1+ HU, JU, MC, PR, WS 1541E 16 1533 1550 Slow-S-SWF 5 1+ JU, MC, PR

18 1720 1740 Slow-S-SWF 4 1 BE, CR, HU, MC, PR, WS *

18 1901 2040 G-SWF 3 2+ BE, CR, MC 1905E 19 1730 1750 Slow-S-SWF 3 1 HU, PR, WS ★

20 0642 0810 S-SWF 4 3 PU, CW+ 0656E 20 1302 1335 G-SWF 3 2 NE, PR £* 1259 20 1452 1553 S-SWF 5 2+ BE, HU, NE, PR, PU, WS, RCA*, CW*** 1445

20 2040 2120 S-SWF 4 2 AD, BE, HU, PR WS

KO, NE, SW, CW?J* 2025

21 1022 1049 S-SWF 4 2 1019 21 1415 1430 S-SWF 5 2- BE, HU, PR, PU 1413 21 1522 1550 S-SWF 5 2+ BE, CR, HU, MC, PR, PU, WS

21 1700 1715 Slow S-SWF 3 2 HU, MC, PR *

21 1715 1735 Slow S-SWF 4 2 BE, CR, MC, PR, WS *

21 1852 1926 Slow S-SWF 4 2+ BE, CR, HU, PR, WS 1850 22 0000 0015 S-SWF 3 1 CA, OK

22 0052 0110 G-SWF 3 1 AD, CA

22 0206 0506 S-SWF 5 2+ AD, CA, OK, TO, CW+ *

22 0926 1022 Slow S-SWF 1 2 NE ** 0925E 22 1128 1155 G-SWF 4 2 MA, PR, SW, CW***

BE, HU, JU, MC, NE, PR, SW, CW*** 1123E

22 1235 1310 S-SWF 5 2

22 1810 1843 G-SWF 3 1+ MC, PR, WS ★

22 2341 0029 Slow S-SWF 5 2+ AD, CA, TO, WS *

23 0845 0857 S-SWF 1 1 NE ** 0844

23 0953 1309 S-SWF 5 3 KO, MA, NE, PR, SW, RCA*, CW*** 0950

23 1825 1915 S-SWF 4 1+ BE, HU, MC, PR, WS 1826

24 C302 0420 S-SWF 4 2 CA, KO, TO, CW+ *

24 0749 0814 S-SWF 1 1 KU 0749E


IONOSPHERIC EFFECTS OF SOLAR FLARES

(SHORT-WAVE RADIO FADEOUTS)

MARCH 1958

IIIo

Start End Type Wide Impor- Observation Stations Known Mar. UT UT Spread tance Flare, UT 1958 Index CRPL-F 164B

24 0958 1008 S-SWF 1 i NE 0953 24 1542 1652 G-SWF 4 2+ BE, CR, HU, MC, PR, WS 1607E 24 2305 2400 Slow S-SWF 5 2 AD, CA, TO, WS 2306 25 0525 0600 Slow S-SWF 4 2 KO, OK 0529E 25 0603 0630 Slow S-SWF 5 2 KO, KU, OK, CW** 0557E

25 1452 1543 Slow S-SWF 5 1+ BE, HU, JU, MC, PR, WS 1449 26 2330 2355 G-SWF 4 2+ AD, TO, WS 2327 27 1200 1230 S-SWF 1 1+ M

BE, DA, HU, MC, NE, PR, PU, SW, WS, RCA*,CW***, 120 IE

27 1535 1658 S-SWF 5 3 CW+ 1535

27 1702 1725 S-SWF 5 2 BE, HU, MC, NE, PR, WS 1702 28 0420 0439 S-SWF 1 2 OK * 28 0502 0530 Slow S-SWF 1 2 OK 28 0606 0625 Slow S-SWF 1 1- OK 28 1000 1023 S-SWF 1 3+ JU 1000

28 1034 1115 S-SWF 5 3+ DA, JU, KU, MA, NE, SW, CW*** 1032 28 1149 1239 S-SWF 3 3 JU, NE 1145E 28 1602 1625 Slow S-SWF 4 1 BE, MC, PR, WS 1547 28 1635 1652 G-SWF 3 1 MC, PR, WS **

AN, BE, HU, MC, NE, PR, PU, WS, RCA^, CW*** 28 1708 1818 S-SWF 5 3 1707E

28 1833 1900 S-SWF 5 2+ BE, HU, MC, PR, WS 1833 28 2024 2040 Slow S-SWF 4 1 AD, MC, PR, WS 28 2042 2108 S-SWF 4 2+ AD, BE, HU, MC, PR, WS, RCA+ 2042 29 0757 0818 S-SWF 5 3 KO, NE, OK 29 1220 1245 S-SWF 4 2 BE, JU, NE, PR, SW 1217E

29

29

1340

1448

1415 S-SWF 5 3 BE, CR, HU, MC, NE, PR, PU, SW, WS, RCA*, CW$$*, CW+++ 1339

1502 S-SWF 5 2 BE, JU, MA, MC, PR, PU, WS 1448E 29 1628 1730 S-SWF 5 3 BE, HU, JU, MC, NE, PR, PU, WS, RCA* CW** 29 1821 1920 S-SWF 5 3 BE, HU, MC, NE, PR, SW, WS RCA+, RCA*, CW** 1820

29 2130 2155 S-SWF 5 2+ AD, AN, BE, CA, HU, MC, PR, WS, RCA+ 2132E 30 0018 0040 Slow S-SWF 5 1 OK, PO, WS 002 IE 30 0109 0121 S-SWF 5 2 AD, AN, OK, PO, TO, CW+ 0102E 30 0500 0505 S-SWF 5 1 OK, PO 0456E 30 0842 0916 S-SWF 1 3+ JU 0842

30 0955 1045 S-SWF 4 3 NE, SW, CW***, CW+++ 0944 30 1552 1610 S-SWF 2 1 MC, PR 1533 30 1613 1640 G-SWF 3 1 MC, PR, WS 1614E 30 1742 1845 G-SWF 4 1+ AN, BE, MC, PR, WS 1740 30 1905 1932 Slow S-SWF 4 1- AN, BE, MC, PR, WS

30 2302 2320 Slow S-SWF 5 1+ AD, PO, WS 2304 31 0006 0050 G-SWF 5 2+ AD, CA, OK, WS 0005 31 0050 0210 S-SWF 5 3+ AD, CA, OK, CW+ 31 0756 0814 Slow S-SWF 4 2 KO, OK 31 1420 1435 S-SWF 5 1- BE, MC, PR, PU

31 1438 1453 S-SWF 5 1+ BE, PR, PU, WS 31 1935 1952 Slow S-SWF 2 1 fffi, WS 1932

COMMERCE - STANDARDS - BOULDER * No known flare patrol at this time

CA =* Canberra, Australia CR =* Cornell University, N.Y. DA = Darmstadt, G.F.R. JU = Juhlesruh, G.D.R. KO = Kodaikanal. KU « Kuhlungsbom MA =» Madrid, Spain NE * Nederhorst den Berg, Netherlands. PO = Potsdam PU * Prague, Czech.

SW * Enkoping, Sweden SY * Sydney, Australia TO *= Hiraiso Radio Wave Observatory, Japan. CW* = Cable and Wireless, Barbadoes CW** = Cable and Wireless, Somerton, England. CW*** = Cable and Wireless, Brentwood, England CW+ = Cable and Wireless, Hong Kong. CW+-H- = Cable and Wireless, Accra RCA* = RCA Communications Inc., Riverhead, N.Y. RCA+ = RCA Communications Inc., Pt. Reyes, Calif.

IVa

SOLAR RADIO EMISSION

OUTSTANDING OCCURRENCES

APRIL 1958

OTTAWA 2800 MC

Apr.

1958

Type* Start UT Hrs:Mins

Duration Hrs:Mins

Maximum Remarks Time UT Hrs;Mins

Peak Flux

1 2 Simple 2 blO 53 > 7 10 54.5 475 in sunrise 1 3 Simple 3. A 12 08.5 2 25 indet 30

6 Complex 12 08.5 9 12 11 20 2 Simple 2 f 14 11.8 13 14 13.9 195

1 1 Simple 1 15 37.7 4 15 38.3 7

1 2 Simple 2 f 16 32.5 3.5 16 34 18 1 2 Simple 2 18 09 4 18 10 65 1 2 Simple 2 22 52.5 1 22 53 51 2 2 Simple 2 11 49.5 2.5 11 50 55 2 2 Simple 2 13 25.2 2 13 26.2 13

2 2 Simple 2 f 13 54.5 2 13 55 18 2 1 Simple 1 14 25 1 •14 25.5 7 2 3 Simple 3 f A 15 00 2 10 indet 14

8 Group (2) 15 31 17 2 Simple 2 15 31 2.5 15 31.7 10 6 Complex 15 40 8 15 44.3 70

2 9 Precursor 17 25 1 10 2 Simple 2 17 26 2.5 17 26.5 96 4 Post Increase 5 8

2 2 Simple 2 f 18 05.5 10 18 08.9 110 4 Post Increase 10 9

2 6 Complex f 19 51.5 7.5 19 53.4 260 4 Post Increase 18 12

2 8 Group (2) 20 43 9.8 2 Simple 2 20 43 2 20 44 12 2 Simple 2 20 52.3 0.5 20 52.5 10

3 3 Simple 3 17 44 9 17 48.5 7 3 3 Simple 3 f 18 32 2 30 indet. 15 4 2 Simple 2 13 05.5 1 13 05.9 16 4 2 Simple 2 13 26.6 1 13 27 21 «

4 8 Group (2) 19 20.5 5.5 2 Simple 2 19 20.5 1.5 19 21 48 2 Simple 2 19 24 2 19 24.9 26

5 8 Group (2) 13 52 22.5 2 Simple 2 f 13 52 12.5 13 55.5 38 6 Complex f 14 04.5 10 14 07.8 60

5 2 Simple 2 18 07.5 1 18 08 25 5 1 Simple 1 18 39 2 18 40 6 5 8 Group (2) 19 27.5 5.4

2 Simple 2 19 27.5 0.5 19 27.7 16 6 Complex 19 30.4 2.5 19 30.6 11

5 2 Simple 2 22 51.5 3.5 22 52.5 10 6 1 Simple 1 14 31 2.5 14 32 7 6 6 Complex 19 34 12 19 36.8 13 7 1 Simple 1 20 31 6 20 34 6 9 2 Simple 2 13 46 2.5 13 47 11

9 2 Simple 2 14 35.8 3.5 14 36.8 31 4 Post Increase 25 5

9 2 Simple 2 21 47.2 2 21 47.8 9 10 2 Simple 2 16 17 2 16 18.2 14

4 Post Increase 6 4


IVb



APRIL 1958

OTTAWA 2800 MC

Apr. 1958

Type* Start UT Hrs:Mins

Duration Hrs:Mins

Maximum Remarks Time UT Hrs:Mins

Peak Flux

10 1 Simple 1 21 03 2 21 04 3 10 6 Complex f 22 17 6 22 21 17 11 2 Simple 2 11 14.5 2 11 15.7 8 11 2 Simple 2 11 41.2 6 11 42.3 28 11 1 Simple 1 11 55 2 11 56 4

11 1 Simple 1 12 51.5 4 12 52 5 11 8 Group (2) 13 30.5 9

1 Simple 1 13 30.5 3 13 32 7 2 Simple 2 f 13 35.5 4 13 37.5 62

11 8 Group (2) 15 54.5 8 2 Simple 2 15 54.5 4 15 55.2 10 1 Simple 1 16 00 2.5 16 01.1 3

12 1 Simple 1 17 00 6 17 00.9 6 15 2 Simple 2 12 27 2 12 27.4 18

19 1 Simple 1 22 19.9 1 22 20.2 7 19 2 Simple 2 22 48.2 3 22 49 12 20 2 Simple 2 13 51 0.4 13 51.1 11 20 2 Simple 2 15 05.8 0.4 15 05 9 8 21 6 Complex 20 49.3 3.5 20 50.2 17

23 6 Complex 18 53 8 18 57.5 13 24 2 Simple 2 16 21.3 1 16 21.8 10 26 2 Simple 2 10 49.5 3 10 50.4 18 27 1 Simple 1 f 18 04 2 18 04.5 5

28 8 Group (2) 17 21 6.5 1 Simple 1 17 21 2 17 22 3 2 Simple 2 17 24.5 3 17 25.7 9

28 6 Complex 23 18.5 6 23 20.4 97 in sunset osc.

29 8 Group (2) 10 50 11 1 Simple 1 10 50 2.5 10 51 7 1 Simple 1 10 58 3 10 59.5 7

2 2 Simple 2 11 54. 1 2 11 54. 7 74 29 1 Simple 1 12 13.8 0.5 12 14 5

29 2 Simple 2 f 13 06 2.5 13 07.5 12 1 29 8 Group (2) 13 22.1 5.4

2 Simple 2 13 22.1 1.5 13 22.8 26 1 Simple 1 13 26.5 1 13 26.8 7

29 2 Simp 1e 2 14 48.8 0.7 14 48.9 14

29 8 Group (2) 16 54.8 1.6 1 Simple 1 16 54.8 0.3 16 54.9 6 1 Simple 1 16 55.7 0.7 16 55.9 7

29 3 Simple 3 A 18 52 2 10 indet. 27 1 Simple 1 19 57.6 1 19 57.9 6

30 1 Simple 1 17 14.8 1.5 17 15.2 4 30 2 Simple 2 18 39.5 3 18 40.5 14 30 3 Simple 3 f 19 20 40 19 31 15


IVc


DAILY DATA

APRIL 1958

CORNELL 200 MC

Apr. 1958

Flux Density 10"22w m"2(c/s)'

Hours UT

1 Variability

0 to 3 Hours UT

Observing Periods

Hours UT 12 15 18 12 15 18

15 18 21 15 18 21

1 [37 35 39 [1 1 2 1335-2100 2 [20 29 27 [2 2 2 1335-2100 3 [13 16 17 [1 2 2 1340-2045 r „„„ „

4 [20 18] 15 [1 1] 1 1340-1715 /l8UU-2U15 U4U i/o, ] 2020-2100 5 [13 17] [1 1] 1335-1705 L

6 [14 14] [1 1] 1335-1715

7 [20 16 14 [ 1 2 1 1325-2010, 2020-2100 8 [13 12 12] [1 0 0] 1340-1940

9 [16 12 14 [2 1 1 1335-2110 10 [[14 13 12 [[1 1 1 1415-2100

11 [[12 13 13 [[1 1 2 1350-1925 12 [[12 12 12]] [[0 1 OH 1340-1910

13 [12 12] [1 1] 1330-1700 i4 [[12 12 12 [[1 1 0 1345-2100

15 [12 12 12 [0 0 0 1335-2100

16 [[12 11 11 [[0 1 1 1430-1940

17 [13 13 12 [1 1 1 1330-2100 18 [11 11 11 [0 0 0 1330-2100

19 [11 11 11 [0 1 1 1320-2110 20 [11 11] [1 1] 1340-1700

21 [11 12 12 [0 0 0 1330-2115 22 [14 12 11 [1 1 0 1330-2100

23 [12 12 12]] [1 0 0]] 1330-2105 24 [11 11 11 CO 1 1 1340-2100 25 [12 14 13 [0 1 1 1340-1500, 1530-2105

26 [13 133 [1 1] 1305-1700

27 [[12 12]] [[1 1]] 1350-1615

COMMENCE - STANDARDS - BOULDER

[= first hour missing. [[ = first two hours missing.

] = last hour missing. ]] = last two hours missing.

IVd



APRIL 1958

CORNELL 200 MC

Apr. 1958

Type Ap.J

Start UT

Time of Maximum

Duration Minutes

Type IAU

Man. Flux Density 10 22w m 2(c/s)*l

Remarks Inst. Smooth

1 8 1538 1538* 1.5 CA 3100* 1700*

2 1632 1634.5* 4.5 CA

2 2002 2006.5* 6 CA

8 2035 2036.5 4 CA 530* 260*

2 2 1353.5 1538* 6.5 CA 880* 630*

8* 1539.5* 1540* 1* CA* 2400* 1700* 8 1608.5 1609* 6 ECA* 4400* 1700*

2 1740 1743.5* 7 CA 530* 380*

2 1838.5 1844* 9 CA 1200* 740* 8 1852.5 1852.5* 1.5 CA 1000* 630*

8 1945.5 1946* 2 CA 2000* 1500* 8 1951.5 1952* 2 ECD 82,000* 58,000* 8 1955 1957* 20 CD 25,000* 14,000* these two may be considered

a major +(9) 0 2021 >39 SA

3 7,4 1603.5 235 E 4 3 1628 1 CA ~65 off-scale on linear record

8 1641.5 1642 2 CA ~ 65 8 1855 '858* 5 ECD 140* 91*

8 1921 1921*1923* 6 ECD 91* 55* 2 2011 2013* 3.5 CA 91* 55*

5 0 1359 71 SD 8 1403.5 6 ECD ~65 off-scale on linear record

7 3 1507 2 CD 46 25 2 1516 5 CD 49 25 1 1639.5 70 F

2 1808 1815.5* 11 F 120* 55* 1942 1942* 1 1700* 1500*

8 1 1346 65 F 9 6,4 b!335 >89 F

1 1636.5 45 E

3 1653.5 1653.5* 1.5 CA 91* 55* 2 1816 36 F

7 1943 >86 E 3 1947.5 1947.5* 1 CA 91* 72*

10 2 1644 1644.5* 2 CD 450* 310* 2 1651.5 1652.5 2 CD 49 25 3 1659.5 .5 CD 40 23

3 1743 1743.5* .5 CD 120* 72* 3 1829 0.25 CD 52 36

13 3 1531.5 1532.5* 1.5 CD 210* 140* 3 1635 1635* .5 CD 91* 72*

14 3 1408.5 1409 1 CD ~65 off-scale on linear record

3 1512 1512* 1.5 CD 91* 55* 3 1925.5 1925.5* 1.5 CD 140* 120*

16 3 1504.5 .5 CD 140* 120* 3 1550 0.25 CD 210* 140* 3 1819 1819.5* 1.5 CD 210* 140*

3 1823 1824.5 2.5 CD 47 26 3 1859.5 <0.25 CD 52 35

17 2 1629.5 3 CD ~ 65 off-scale on linear record 19 3 1927 1927* 1.5 CD 310* 260* 20 2 1349.5 1351* 3 CD 140* 120*

3 1514 1514.5 1.5 CD ~65 off-scale on linear record 24 8 1522 8 ESD ~ 65 off-scale on linear record

8 1844 1844.5* 3 CD 180 140*

* Logarithmic recorder COMMERCE STANDARDS BOULDER

IVe


DAILY DATA

MARCH 1958

BOULDER 167 MC

Flux Density Variability Observing Periods 10'22w m“2(c/s r1 0 to 3

Hours UT Hours UT Hours UT

1958 0 12 15 18 21 Day 0 12 15 18 21 Day

Mar. 3 15 18 21 24 3 15 18 21 24

1 _ _ 23 22 _ 22 _ 1 2S _ IS 15.5-20.5 2 - - 18 17 18 18 - - 0 0 IS 0 15.0-24.6

3 - - 121 29 18 73 - - IS 2 2S 2S 14.8-24.6 4 - - 18 19 19 19 - 0 2S IS IS IS 13.5-19.8,20.3-24.7

5 - - 20 18 20 19 - 0 1 1 OS 1 13.5-24.7

6 _ _ 20 22 20 21 _ OS 1 IS 2S IS 13.4-24.7

7 - - 22 25 22 24 - 2 2 2S 2S 2S 13.4-24.7 8 - - 52 149 384 180 - 2 2 3 3 3 13.4-24.7

9 - - 79 119 125 108 - 2 2 2 2S 2 13.4-24.7 10 - - 113 83 83 95 - 2 2 2 2S 2 13.4-24.8

11 _ 33 40 60 43 _ 2 2 2 2S 2 13.3-13.6,14.5-24.8 12 - - 31 4l 33 35 - IS 1 2 2S 2S 13.3-20.3,20.5-24.8 13 - - 29 34 32 31 - 1 1 IS 2S IS 13.8-24.8 14 - - 24 22 22 23 - - IS IS IS IS 15.5-24.8 15 - - - 21 19 21 - 1 IS IS IS IS 13.3-14.8,16.3-24.8

16 _ _ 17 17 16 17 _ 1 0 0 2S 1 13.3-24.8

17 - - - 17 16 17 - 1 - IS OS IS 14.1-24.8 18 - - 18 17 20 18 - 2 IS OS IS IS 13.2-24.8

19 - - 25 19 20 22 - 2S 2S 2 2S 2S 13.2-24.9 20 - - 117 158 117 127 - 2 2 2S 2S 2S 13.1-24.9

21 _ _ 53 36 58 51 _ 2 2 2S 2S 2S 13.1-24.9

22 - - 28 30 21 26 - 2 2 1 1 2 13.1-24.9

23 - - 31 21 20 25 - 1 2S 2 2S 2S 13.0-24.9

24 - - 20 20 24 21 - 2 2S 2S 2S 2S 13.O-OI.O

25 - - 38 43 54 44 - 2 2S 2S 2S 2S 13.O-OI.O

26 _ _ 74 74 56 65 _ 2 2 2 IS 2 13.8-01.0

27 - - - 111 92 104 - 2 IS IS IS IS 12.9-01.0

28 - - 65 62 55 63 - 1 2 2S 2S 2S 12.9-OI.O

29 - - 85 220 84 130 - - 2S 2 2 2 14.2-01.0

30 - - 114 50 25 64 - 2 2 2S 2 2 12.8-01.1

31 - - 24 30 48 33 - 2S 2S 2S 2S 2S 12.8-14.1,15.0-17.5, 18.1-20.8.21.9-01.1_

COMMERCE - STANDARDS - ROULOER



MARCH 1958

IVf

BOULDER 167 MC

Mar. 1958

Type Ap. J

Start UT

Time of Maximum

Duration Minutes

Type IAU

Ma.:. Flux Density 10" 2 (c/ s) • 1


1 1 1530 B 1812.1 300 D MF 120 - Burst 1758.3

3 9 1349 1559.0 191 X CD 420 160

3 1 1700 X 1803.3 455 D MF 1100 - N2 4 1 1330 B 2434.9 670 D MF 530 -

6 1 1325 B 2307.0 675 D F 770 - S

7 6 1325 B 1848.8 675 D CD 400 10 N3 8 6 1325 B 2003.8 675 D CD 1200 370 Large bursts I923.I, 1952.2

9 6 1325 B 1453-8 675 D CD 1300 110 n4

9 2 1433. 3 1434.0 00.8 ECD 920 -

9 2 2049. 8 2049.9 00.7 ECD 1200 -

10 6 1325 B 1929.2 680 D CD 64o 100 N5 11 6 1320 B 2231.O 685 D CD 770 43 S Large burst 2200.4 12 6 1320 B 1922.0 685 D CD 540 27 S

13 6 1350 B 1549.5 655 D CD 190 17 S 14 l 1530 B 1704.7 555 D MF 95 - S

15 l 1315 B 1723.5 690 D MF 170 _

16 2 2034 2040.4 07 ECD l4o 22 16 3 2330. 0 2330.2 01 ECD 360 -

18 1 1310 B 1625.1 700 D MF 200 - S

19 6 1310 B 1918.3 705 D CD 310 11 S N6

20 6 1305 B 1533.8 710 D CD 970 i4o S N7 21 6 1305 B 1422.6 710 D CD 670 54 S Large bursts 1355*9,1421.1 22 6 1305 B 2222.3 710 D CD 430 13 S Large burst 1913-0 22 0 1634 1948.4 22 CD 540 no S 22 3 1822 1822.3 01 ECD 1500 -


Notes: 1. Interference may obscure or be mistaken for solar events. Relatively small events are not reported.

2. March 3, Large bursts 1830.2, 211+7.3, 2346.0, 2409.8. Bursts 2254.3, 23IU.O, 2409.1. 3. March 7, Large burst 11+02.3, Burst 1854.7. 1+. March 9, Large burst 1354.3, Burst 2119.5. 5. March 10, Bursts 11+34.8, 1442.0, 1559.1, 2101.8, 2437.2. 6. March 19, Large bursts 1440.8, 2446.7. 7. _. March 20, Large bursts 1317-7, 1509.9, 1754.0, 2254.4.

IVg



MARCH 1958

BOULDER 167 MC

Mar.

1958

Type Ap. J

Start UT

Time of Maximum

Duration Minutes

Type IAU

Max. Flux Density lCT^w ra"^(c/s)”^


23 6 1300 B 1^37-3 405 X CD 440 16 Large burst 1313-lj1508.6 23 1 1945 X 2152.8 310 X MF 170 - Burst 2306.7 24 l 1300 B 1730.3 525 X MF 750 - S N8 Burst 2016.7

24 6 2145 x 2315.3 195 x CD 170 10 S

25 6. 1300 B l4l4.l 720 D CD 900 37 S N9

25 3 2434.2 2434.4 1.8 ECD 1400 -

26 6 1350 B 2308.1 670 D CD 470 57 Large burst 1522.1

27 6 1255 B 1523.7 725 D CD 430 100 S Large burst 1417.1

28 6 1255 B 1647.1 725 D CD 540 55 S Large burst 1818.9,1907.7

29 6 1410 B 1438.6 285 X CD 1100 96 S

29 9 1855 X I 182 X CD 1600 210 S N10 29 6 2157 X 2131.I 183 X CD 1400 79 29 3 2135 2135-7 02 ECD 1400 370 30 6 1250 B l4o4.3 130 X CD 240 53 Large burst 1302.1 30 9 1500 X 1630.4 145 X CD 860 47

30 6 1725 X 2322.8 46o X CD 1400 250 S 30 3 1908 1908.I 01 ECD 1600 -

30 3 2301.3 2301.9 02 ECD 730 280 30 3 2322.8 2322.9 00.5 ECD 1400 _

30 2 2345 2346.1 03 CD 1100 390

31 6 1250 B 1533.5 735 D CD 2000 D 30 S Nil 31 3 1652 1652.8 02 ECD 1200 390 31 3 1712.8 1713.'t- 01.1 CD 1000 -

31 3 1718.6 1719.4 01.4 ECD 1300 -

31 2 1936 1936.7 04 ECD 1600 520

COMMERCE - STANDARDS -BOULDER

8. March 24

9- March 25; 10. March 29.

11. March 31.

Probable group of bursts occurred 1636-1639. Burst 2016. J Large bursts 1444.1, l8l7.7> 2437-1- More than 10 large bursts having a flux value of approximately 1600 occurred 1919-19^5 any one of which could have been considered the maximum. Also during this period the hourly calibration was taken from 1926-1929. Large bursts 1302.7, 1332.0, 1712.0. Bursts 1623.0, 1802.1, 2308.5-

IVh


DAILY DATA

MARCH 1958

BOULDER 470 MC

Flux 10"22w

Density m"^(c/s) -1

Variability 0 to 3

Observing Periods

Hours UT Hours UT Hours UT Mar. 0 12 15 18 21 Day 0 12 15 18 21 Day 1958 3 15 18 21 24 3 15 18 21 24

1 _ _ 79 79 79 79 - - 1 0 1 1 14.0-23.3,24.0-24.6 2 - - 78 79 79 79 - - 0 0 0 0 14.8-24.6

3 - - 79 79 79 79 - - 0 1 1 1 14.0-24.6 4 - - 79 8o 80 79 - 0 0 0 OS 0 13.5-24.6

5 - - 79 80 80 79 - 0 0 IS OS OS 13.5-17.0,17.6-24.6

6 _ _ 80 80 80 80 _ 0 OS 0 OS OS 13.5-24.7

7 - - 81 81 81 81 - 0 0 0 0 0 13.4-24.7 8 - - 81 81 100 87 - 1 0 0 1 0 13.4-24.7

9 _ - 80 80 80 80 - IS 1 1 0 1 13.4-24.7 10 - - 79 79 80 79 - - 0 0 OS OS 13.7-24.7

11 _ _ 79 80 79 79 _ 0 0 0 OS 0 13.3-24.8 12 - - 79 79 79 79 - - 0 0 OS 0 13.7-20.0,20.2-24.8 13 - - 79 79 79 79 - - 0 0 0 0 13.8-24.8 14 - - 79 79 79 79 - OS OS OS OS OS 13.8-24.8 15 - - 79 79 79 79 - - 1 0 0 0 13.7-23.0,23.5-24.8

16 _ _ 78 77 78 78 _ _ 0 1 0 0 13.8-24.8 17 - - 77 - 78 78 - - 0 - OS OS 14.2-18.0,18.9-20.2,N1 18 - - 78 78 78 78 - - 0 OS OS OS 14.0-24.8 19 - - 79 79 79 79 - - OS OS IS OS 13.8-24.8 20 - - 81 81 79 80 - - 0 0 0 0 13.8-24.8

21 _ _ 79 79 79 79 _ _ 1 2 OS 1 13.9-24.9 22 - - 80 80 79 80 - 0 0 1 OS 0 13.1-24.9

23 - - 79 78 78 79 - - 1 0 0 0 13.9-24.9 24 - - 78 79 78 78 - - 0 0 OS 0 14.0-24.9 25 - - 79 79 79 79 - 1 1 OS OS OS 13.8-24.9

26 _ _ 79 79 79 79 _ _ IS 1 IS IS 13.8-01.0

27 - - 79 79 - 79 - - 1 OS - IS 13.8-20.4,22.9-01.0 28 - - 78 78 79 78 - - OS 0 OS OS 13.8-01.0

29 - - 79 79 78 79 - 2 1 1 2S 2 13.8-01.0

30 - - 89 79 78 82 - - 2 1 2 2 13.9-OI.I 31 - - 79 79 79 79 " OS 1 OS 1 IS 12.8-01.1

Notes: 1. March 17, cont'd. 21.8-24.8. COMMERCE - STANDARDS BOULDER

IVi



MARCH 1958

BOULDER 470 MC

Mar. 1958

Type Ap. J

Start UT

Time of Maximum

Duration Minutes

Type IAU

Max. Flux Density 10“ m“^(c/s)”^


1 3 1338.4 1338.7 00.9 ECD 95 - S

1 2 2235-4 2235.9 01.8 CD 150 26 Burst 2409.8 3 3 1943.6 1943.6 00.1 ECD 260 - Burst 2043.9 3 2 2143 2147.1 06 CD 180 23 3 2 2341 23^5.2 05 CD 210 28

5 2 2038.2 2038.9 00.8 CD 300 - S

8 0 2200 X 2304 160 X SD 130 21 Burst 1327 8 3 2234.5 2235.1 00.7 CD 370 -

9 0 1530 I 1547.6 18 I CD no 24

9 3 1655.5 1655.6 00.5 ECD 260 -

9 3 2043.7 2043.7 00.1 ECD 420 -

15 3 1933.0 1933.3 00.4 ECD 4oo - S

16 3 1942.8 1942.9 00.2 ECD 350 -

19 2 2049.3 2410.1 00.8 CD 340 - S

20 1 1346 B 1930 x 664 D M 120 - S

21 2 1716.8 1718.0 04.3 CD 420 39 21 2 1940.8 1942.5 04.1 CD 760 130 22 1 1305 B 1712.7 710 D M 130 - S

22 8 1827.5 1846.8 23.5 CD 230 77 22 0 1904 1914.0 21 SD no -

23 3 1717.1 1717.2 00.2 ECD 380 -

24 1 1434 X 1502.7 30 X MF 120 -

24 1 1843 1930.4 372 D MF 100 - S

25 3 1422.0 1422.2 00.3 ECD 170 - S

26 1 1346 B 2003.3 674 D MF 160 - Bursts 1755,2250

27 1 1348 B 2305.3 672 D MF 370 _ I 2026-2256, Burst 1403.8 27 2 1702 1702.7 04 ECD 370 65 28 1 1350 B 1547.9 670 D MF 350 - S

29 1 1344 B 1820.3 676 D MF 200 - N2 29 2 1442 1448.3- 08 CD 520 150

29 2 2125 2136.4 12 I CD 260 45 30 1 1354 B 1422.1 96 X MF no -

30 6 1530 X 1549.3 no x MF 420 11 N3 30 l 1720 X 2157-9 465 x MF 360 -

30 3 1750.9 1751.1 00.5 ECD 1200 -

30 3 1907.9 1908.0 00.4 ECD 790 -

30 2 2008.4 2009.4 o4.i CD 160 37 30 2 2431.4 2431.7 01.5 CD 1400 390

31 _ 124S B 1729.7- 7kQ-D MF1 280 S N4 COMMERCE - STANDARDS - BOULOER

Notes: 1. 2. 3- 4.

Interference may occasionally obscure or be mistaken for solar events. March 29, Bursts 1651.7, 1704.2, 2312.3, 2420.9, 2427.5, 2429.8, 2452.4, 2500.4. March 30, Bursts 1957-8, 2102.8, 2134.2, 2301.8, 2305.6. March 31, Bursts 1608.4, 1651-9, 2308.3, 2323.7.

Va

GEOMAGNETIC ACTIVITY INDICES

MARCH 1958

Mar. 1958

C Values Kp

Sura Ap Final

Selected Days

Three hour Gr. interval 1 2 3 4 5678

1 0.3 3+ 1+ lo lo 2- lo lo 2- 12o 6 Five 2 0.2 1- 2o 3+ 3- 2- 0+ 0+ 1+ 12+ 7 Quiet

3 1.2 lo 2o 2o 3+ 4- 4o 5o 4+ 25+ 21 k 1.2 5o 5- 4o 4- 4o 3+ 4o 3+ 32o 28 1

J_

5 1.4 3+ 4o 7- 5o 4o 4- 4- 5- 35o 39 2 16

6 1.4 5+ 5+ 4o 4o 4+ 4o 4o 4+ 35+ 36 28

7 1.1 4- 5+ 4+ 4- 4- 4- 3+ 3+ 31o 26 29 8 1.0 5o 4+ 4+ 3+ 3+ 2o 3- 3- 28- 22

9 1.0 4o 4o 4- 4o 4- 3o 3- 2- 27- 20 10 0.9 4- 4o 2+ 3- 3+ 4- 4- 3- 26o 18

11 1.1 4o 2- lo 3o 4- 4o 5- 5- 27- 22 Five 12 1.6 7o 7o 7- 5- 4+ 4+ 4- 3o 41- 64 Disturbed

13 1.5 5- 5+ 6- 5o 6- 5o 5o 2+ 39- 48 14 1.2 3- 1+ 1- 2- 6- 5- 3- 3- 22o 20 5

15 1.2 2+ 4+ 5- 5- 4- 4o 3- 2o 28+ 23 12 13

16 0.8 5- 4+ 2+ 2+ 1+ 2o 3- 3+ 23o 16 19

17 1.2 3- 3+ 5- 5o 4o 4o 5- 2- 30o 27 20 18 1.3 3o 4o 5- 3- 4+ 6- 5+ 4- 33+ 34 19 1.5 4o 4+ 5- 4o 5- 5+ 6- 6- 38+ 44 20 1.4 5o 5o 4+ 4o 4- 4o 5o 5o 36o 38

21 1.3 4o 5o 4o 3+ 5- 5o 3+ 5- 34o 33 Ten 22 1.0 60 5- 2o 2- 3- 2- 2o 4+ 25o 24 Quiet

23 1.1 4o 4o 3+ 3+ 3- 3o 5- 2+ 27+ 21 24 1.2 3+ 4o 3+ 3+ 4- 5o 5- 4o 31+ 27 1 25 1.4 5o 3+ 4o 3+ 4- 60 4o 4o 33+ 33 2

Q

26 1.1 3+ 3o 2+ 4o 5o 5+ 4- 4- 30+ 27 10

27 0.9 4o 3- 3- 3o 2- 3o 3o 4+ 24+ 17 14 28 0.7 3- 3+ 3o 2- 2- 4+ 3o 3o 23- 15 16 29 0.4 4- 3+ 2o 1+ 1- 3- 2o 2o 18- 10 27 30 1.3 1+ lo 4+ 5- 5+ 6- 4o 4- 30o 32 28 31 0.8 3o 4+ 3+ 3o 3o 3+ 3o 3o 26o 18 29

31

Mean; 1.09 Mean: 26

COMMENCE STANDARDS BOULDER

Vb

CO

MM

ER

CE

-

ST

AN

DA

RD

S

-

BO

UL

DE

R

CRPL RADIO PROPAGATION QUALITY FIGURES AND FORECASTS

NORTH ATLANTIC

MARCH 1958

North Atlantic Short- -term forecasts Whole Advance forecasts Geomag-

Mar. 6-hourly issued about one day (j-reports) for netic

1958 quality figures hour in advance of: index whole day; issued KFr in advance by:

00 06 12 18 to to to to 00 06 12 18 1-4 4-7 8-25 Half Day 06 12 18 24 days days days (1) (2)

1 7° 7+ 7° 7+ 7 7 7 7 7° 7 7 1 1 2 7° 7° 7° 7° 7 7 7 7 7° 7 7 2 1 3 7- 6+ 7+ 6+ 7 7 7 7 7- 7 7 2 (4) 4 5- 5+ 6+ 6+ 6 5 6 6 6- 6 7 (4) 3 5 6° 5+ 7- 7- 6 6 6 6 6+ 4 7 (4) 3

6 5+ 5° 7° 6+ 6 5 6 6 6° 4 7 (5) 3 7 6- 5+ 7° 6+ 5 5 7 6 6° 6 6 (4) 3 8 6- 5° 7° 7° 5 5 7 6 6+ 6 6 (4) 2 9 7- 6+ 6+ 7- 6 6 7 7 7- 6 6 3 3

10 6+ 7- 7- 7- 6 6 7 7 7- 7 6 3 3

n 6+ 6+ 7- 6+ 7 7 7 7 6+ 7 7 2 3 12 5- 4+ 6- 6- 6 3 5 5 5° 7 7 (6) 3 13 4° 3+ 5+ 6- 5 4 5 4 (4+) 7 7 (4) (4) 14 6- 5+ 6° 7- 4 5 6 5 6° 5 6 1 (4) 15 7° 6° 6+ 7- 5 6 6 6 7- 6 6 3 3

16 7- 7- 7° 7- 6 6 7 7 7- 6 6 3 2 17 7° 6° 7- 7- 7 7 6 7 7- 6 6 (4) 3 18 6° 6° 7- 6- 6 5 6 7 6+ 6 5 3 (4) 19 5+ 6- 6+ 5+ 6 4 6 6 6- 6 5 (4) (4) 20 5+ 5° 6° 6- 5 5 6 6 6- 6 5 (4) 3

21 5+ 6- 6° 6- 5 5 6 5 6- 5 7 3 (4) 22 5° 6- 6+ 7- 5 5 7 6 6- 5 7 3 3 23 6° *4+ 6° 6° 5 6 5 5 *5+ 4 7 3 3 2 4 6+ 6° 6+ 6- 5 5 6 5 6° 4 7 3 3 25 5+ 6° 6° 5° 4 5 6 4 6- 4 5 (4) (4)

26 5+ 6- 5+ 5+ 4 6 6 5 6- 4 6 3 (4) 27 6+ 6° 6- 6- 5 6 6 5 6° 5 6 3 3 28 6+ 6° 7- 6+ 6 6 6 6 6+ 5 5 2 3 29 6+ 6+ 7- 7- 7 6 7 6 7- 5 5 2 1 30 7° 7- 7- 6+ 7 7 5 5 7- 5 5 2 (4) 31 6° 6- 7- 6+ 5 5 6 6 6° 6 5 3 3

Score Quiet Periods P 12 15 19 13 11 8 S 16 12 11 16 11 18 U 1 0 1 1 3 4 F 1 (1 0 1 5 0

Disturbed Periods P 0 0 0 0 0 0 S 1 2 0 0 0 0 U 0 0 0 0 0 0 F 0 1 0 0 1 1

( ) represent disturbed values. commerce - standards - boulder

* These below normal indices are the result of a particularly severe short-wave fadeout at 0955 U.T., and are not associated with radio or magnetic disturbance.

QU

AL

ITY

QU

AL

ITY

QU

AL

ITY

VIb


NORTH ATLANTIC

MARCH 1958

— Short-term forecast I Range of reports

o Quality figure

DAY

DISTURBED

*4*4-_ QUIET

ACTUAL I V 1 COMPARISON (see Text) 1 'H 1

I 1 0 10 20 31

Vic

USEFUL FREQUENCY RANGES - NORTH ATLANTIC PATH

MARCH 1958


VId

MARCH 1958

OhUT 3 6 9 12 15 18 21 24 OhUT 3 6 9 12 15 18 21 24


Adapted from Observations by Deutsches Bundespost

Vie


NORTH PACIFIC

MARCH 1958

North Pacific Short- term fore- Whole Advance forecasts Geomag- Mar. 8-hourly casts issued at day (jp reports) for netic 1958 quality figures index whole day; issued Ko*

in advance by:

03 11 19 to to to 02 10 18 1-4 4-7 8-25 Half Day 11 19 03 days days days (1) (2)

1 7 6 7 7 7 6 7 6 7 1 1 2 7 7 7 6 6 6 7 6 7 2 1 3 8 6 6 7 7 6 7 6 7 2 (4) 4 7 6 6 6 5 5 7 7 7 (4) (4) 5 4 5 5 6 3 5 5 3 7 (5) (4)

6 5 5 6 6 6 5 5 4 7 (5) (4) 7 6 6 6 5 5 6 6 5 7 (4) (4) 8 6 6 6 6 6 6 6 5 6 (4) 2 9 5 5 6 5 6 6 5 6 6 (4) (4)

10 6 6 6 6 6 5 6 6 6 2 3

11 6 6 6 6 6 6 6 6 6 1 (4) 12 4 4 4 6 5 5 (4) 5 6 (7) (4) 13 4 2 4 6 4 3 (3) 6 6 (6) (6) 14 4 5 6 4 5 4 5 6 6 2 (4) 15 6 4 6 5 6 6 5 5 6 (4) (4)

16 6 6 6 6 5 6 6 6 6 2 2 17 4 4 6 5 3 5 5 6 6 (5) (4) 18 6 5 5 5 5 5 5 5 6 (4) (4) 19 4 4 4 5 5 4 5 5 5 (4) (6) 20 5 6 5 4 5 6 5 5 5 (4) (4)

21 5 5 6 5 4 5 5 6 5 (4) (4) 22 5 5 4 4 5 6 5 5 6 2 2 23 6 6 6 5 5 5 6 5 6 (4) 2 24 6 5 5 5 6 4 6 5 6 (4) 3 25 5 4 6 5 5 5 5 5 6 (5) (4)

26 6 4 6 4 5 5 5 5 6 3 (4) 27 6 6 6 5 4 6 6 5 6 3 2 28 6 6 6 6 6 5 6 5 6 2 2 29 6 6 7 6 5 5 6 5 5 2 1 30 6 5 6 6 5 5 6 5 5 3 (4) 31 6 6 5 5 6 6 6 4 5 3 2

Score: Quiet Periods P 11 9 10 11 15 S 13 13 15 16 12 U 0 1 1 1 2 F 1 1 1 1 0

Disturbed Periods P 1 0 1 0 0 S 2 5 2 1 0 U 0 1 0 0 0 F 3 1 1 1 2

( ) represent disturbed values. COMMERCE STANDARDS BOULDER

Vlf


NORTH PACIFIC

MARCH 1958

OUTCOME OF ADVANCED FORECASTS 1 TO 4 DAYS AHEAD


Vila

ALERT PERIODS AND SPECIAL WORLD INTERVALS

Alert Issued Ends

1600 UT 1600 UT

SWI Age On Days of Alert Period (SWI Underlined)

Number of Flares of IMP > 2 Reported Promptly on Days of

Alert Period

1958

Apr 07-Apr 10 16-11-11-09 1-0-1-1

Apr 30-May 05 23-19-08-06-09-10 1-3-2-1-0-5


Reference book not to be taken from the library. · 2017. 11. 30. · CRPL-F16S PART B . FOR...

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Transcript of Reference book not to be taken from the library. · 2017. 11. 30. · CRPL-F16S PART B . FOR...