Reference book not to be tsken from theS39 New. 7158(2) 1.5. 200 . b . d. 12/17 19.6 (1.5) S09 ....

46
waiionai Bureau of Standards Library, N.W. Bldg APR 6 1964 CRPL-F 235 PART B FOR OFFICIAL USE Reference book not to be tsken from the library. PART B SOLAR - GEOPHYSICAL DATA ISSUED MARCH 1964 U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS CENTRAL RADIO PROPAGATION LABORATORY BOULDER, COLORADO

Transcript of Reference book not to be tsken from theS39 New. 7158(2) 1.5. 200 . b . d. 12/17 19.6 (1.5) S09 ....

Page 1: Reference book not to be tsken from theS39 New. 7158(2) 1.5. 200 . b . d. 12/17 19.6 (1.5) S09 . 7152 . New (300) 2 — 1. d . 2/14 27 20.8 (2) N16 . 7155(2) New 1 (200) b — d .

waiionai Bureau of Standards

Library, N.W. Bldg

APR 6 1964

CRPL-F 235 PART B FOR OFFICIAL USE

Reference book not to be

tsken from the library.

PART B

SOLAR - GEOPHYSICAL DATA

ISSUED

MARCH 1964

U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS

CENTRAL RADIO PROPAGATION LABORATORY BOULDER, COLORADO

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Page 3: Reference book not to be tsken from theS39 New. 7158(2) 1.5. 200 . b . d. 12/17 19.6 (1.5) S09 . 7152 . New (300) 2 — 1. d . 2/14 27 20.8 (2) N16 . 7155(2) New 1 (200) b — d .

CRPL-F 235

PART B

NATIONAL BUREAU OF STANDARDS CENTRAL RADIO PROPAGATION LABORATORY

BOULDER, COLORADO

Issued 31 Mar. 1964

SOLAR-GEOPHYSICAL DATA

CONTENTS

I DAILY SOLAR INDICES

(a) Relative Sunspot Numbers and 2800 Mc/s Solar Flux - January - February 1964

(b) Graph of Sunspot Cycle

(c) Zurich Final Relative Sunspot Numbers 1963

II SOLAR CENTERS OF ACTIVITY

(a) Calcium Plage and Sunspot Regions - February 1964

(b) Magnetic Classifications of Sunspots (Mt. Wilson) - February 1964

(c) Provisional Coronal Line Emission Indices - February 1964

III SOLAR FLARES

(a-f) Optical Observations - February 1964

(g) Flare Patrol Observations - February 1964

(h-k) Optical Observations - November 1963

(l) Flare Patrol Observations - November 1963

(m) Ionospheric Effects (SWF-SEA-SCNA-SPA-SES-SFD-Bursts) - January 1964

(n) 26 Mc/s - Riometer Events (South Pole) - January 1963

IV SOLAR RADIO WAVES

(a) 2800 Mc/s Outstanding Occurrences (ARO-Ottawa) - February 1964

(b) 169 Mc/s Interferometric Occurrences (Nani^ay) - February 1964

(c) 108 Mc/s Outstanding Occurrences (NBS-Boulder) - February 1964

(d) 7.6-41 Mc/s Spectral Observations (HAO-Boulder) - February 1964

(e-i) 9.1 cm Spectroheliograms (Stanford) - February 1964

V COSMIC RAY INDICES

(a) Climax Neutron Monitor - January 1964

(b) Deep River Neutron Monitor - January 1964

VI GEOMAGNETIC ACTIVITY INDICES

(a) C, Kp, Ap ard Selected Quiet and Disturbed Days - January 1964

(b) Chart of Kp by Solar Rotations - 1963 - 1964

VII RADIO PROPAGATION QUALITY INDICES

(a) CRPL Quality Figures and Forecasts - North Atlantic and

North Pacific - January 1964

(b) Graphs Comparing Forecasts and Observed Quality - North Atlantic and

North Pacific - January 1964

(c-d) Graphs of Useful Frequency Ranges - January 1964

VIII ALERT PERIODS AND SPECIAL WORLD INTERVALS

(a) IQSY Alert Periods - February 1964

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Page 5: Reference book not to be tsken from theS39 New. 7158(2) 1.5. 200 . b . d. 12/17 19.6 (1.5) S09 . 7152 . New (300) 2 — 1. d . 2/14 27 20.8 (2) N16 . 7155(2) New 1 (200) b — d .

The descriptive text was republished November, 1963.

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Ia DAILY SOLAR INDICES

Feb. 1964

Zurich Provisional Relative Sunspot

Numbers

RZ

Daily Values Solar Flux at 2800 Me, Ottawa, Canada

Flux

1 0 73 2 0 72

3 0 71 4 0 71

5 0 72

6 0 73

7 10 72 8 13 73

9 20 72 10 8 73

11 0 72 12 0 73

13 0 73 14 8 73

15 15 73

16 16 73

17 16 74

18 8 76

19 8 76

20 23 76

21 39 79

22 41 80

23 54 84

24 44 85

25 30 84

26 34 87

27 30 85 28 34 84 29 23 81

30 31

Mean; 16 .3 76

Jan. 1964

American Relative Sunspot Numbers

rA'

1 0 2 1

3 0 4 1 5 7

6 19 7 20 8 16 9 4

10 4

11 6 12 6 13 19 14 25 15 25

16 11

17 2 18 1

19 10 20 16

21 14 22 14

23 12 24 14 25 14

26 13 27 14 28 26 29 24 30 17 31 4

Mean: 11.6

COMMERCE STANDARDS BOULDER

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Ic ZURICH FINAL RELATIVE SUNSPOT NUMBERS

1963

Day Jan. Feb. Mar. Apr. May June July Aug. Sep. Oct. Nov. Dec.

I 23 30 0 15 23 31 30 65 20 0 45 28

2 29 25 0 25 22 26 22 55 25 7 52 31

3 34 44 8 28 24 15 37 53 34 9 43 30

4 35 53 14 17 20 13 22 51 43 8 37 30

5 23 47 22 23 26 23 9 50 42 0 29 28

6 8 50 32 50 43 8 9 53 31 15 13 25

7 7 48 35 50 46 29 9 38 9 20 10 17

8 8 40 29 63 55 54 10 23 14 32 11 13

9 7 32 32 55 48 68 17 22 15 37 9 32

10 8 21 34 59 64 82 9 20 23 32 0 27

11 8 18 23 48 64 82 10 9 22 40 8 26

12 8 16 18 63 55 87 10 0 28 39 11 18

13 9 9 17 56 54 82 18 7 40 42 7 10

14 33 16 24 45 56 57 22 13 65 51 7 8

15 44 17 15 50 65 54 19 11 84 49 9 7

16 40 16 8 50 66 33 11 18 85 52 16 7

17 40 18 13 41 76 27 11 29 81 50 24 8

18 21 16 19 34 78 25 13 43 73 40 28 17

19 20 20 12 28 68 23 15 36 72 29 25 15 20 16 20 13 19 58 19 11 36 73 37 28 17

21 16 20 13 10 49 19 19 50 77 35 30 14

22 7 20 16 0 37 7 19 68 70 45 34 13

23 17 22 17 0 24 15 25 64 54 50 36 9

24 15 20 19 0 28 24 17 50 38 51 35 16

25 17 16 10 0 18 29 25 37 25 53 32 8

26 7 11 16 0 9 34 16 29 13 52 23 7

27 14 17 15 0 18 31 23 16 0 38 23 0

28 34 0 7 7 36 24 7 21 9 24 21 0

29 25 12 16 32 30 24 16 0 54 27 0

30 23 17 26 37 27 55 23 0 58 28 0

31 18 19 35 65 24 45 0

Mean 19.8 24.4 17.1 29.3 43.0 35.9 19.6 33.2 38.8 35.3 23.4 14.9

COMMERCE STANDARDS BOULOER

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CALCIUM PLAGE AND SUNSPOT REGIONS I la

FEBRUARY 1964

Feb. 1964

LAT. MCMATH PLAGE

NUMBER

RETURN OF

REGION

CALCIUM PLAGE DATA SUNSPOT DATA CMP VALUES HISTORY AGE

(ROTA¬ TIONS)

DATE FIRST SEEN(i)

DURA- TION (DAYS)q

CMP VALUES HISTORY AREA INT AREA COUNT

Jan. 31.0 S23 7127(2) New (300) (l) b ~ i i 2/5 1 31.8 S35 7116 (2) New (100) (2) b - d i 1/28 1

Feb. 01.0 N28 7120 New 300 1.5 b r~ i i 1/29 7 01.1 N13 7132 (2) New (200) (1) b — i 2/5 1 03.2 N45 7124(2) New 200 1.5 b — d i 2/4 1

03.5 N20 7122 7095 100 1.5 2 / 8 1/29 10

03.8 N04 7121 New 600 1.5 i r~ i 1 1/29 11

03.8 S21 7128(2) New 200 2 b - d 1 2/5 1 05.6 S09 7133 New 400 3 b / 2 1 2/6,7 5 05.7 NO 8 7134 New 400 2 b ~\ d 1 2/7 2 06.1 N27 7135 New 300 2 b —\ d 1 2/7 3 06.1 N47 7125 (2) New 100 2 b — d 1 2/4 1

06.7 N09 7129 New 300 1 b /~ d 1 2/5 3 07.2 NO 1 7131(2) New 200 2 b — d 1 2/5 1 07.7 S20 7136 New 200 1.5 b r~ d 1 2/7 2 09.6 N16 7126 New (200) (2) 2 - d 1 2/3 3 09.7 N05 7144 New 100 2 b A d 1 2/10 3

10.1 N31 7140 (2) New 100 2 b — d 1 2/9 1 10.3 S10 7149 New (200) (1.5) b “\ 2 1 2/14 2 10.1 S05 7137(2) New (400) (2.5) b — d 1 2/7 1 10.5 S15 7146 (2) New 300 1 b — d 1 2/11 1 10.7 Nil 7130 7102 400 2 2 ~\ d 6 2/4 29

10.7 Sll 7145(2) New 100 1.5 b — d 1 2/10 1 11.3 N20 7141 New 200 1.5 b - d 1 2/9 2 11.4 S29 7142 (2) New 100 2 b - d 1 2/9 1 11.9 S15 7148 (2) New 100 1.5 b — d 1 2/12 1 12.3 S08 7138(2) New (400) (1.5) b d 1 2/7 1

12.7 N10 7139 (3) 400 1.5 2 r d 6 2/<7 >10 12.6 S28 7143(2) New (100) (2) b — d 1 2/9 1 12.7 N26 7150 New 100 2 b A 2 1 2/14 4 13.9 N02 7147 (4) 500 1.5 b r 1 2/11 >7 14.5 S 15 7156(2) New (200) (1.5) b — 2 1 2/17 1

15.8 N04 7157(2) New 200 1.5 b _ d 1 2/17 1 17.3 NO 8 7151 New 600 1.5 b r d 1 2/14 >4 18.9 S39 7158(2) New 200 1.5 b — d 1 2/17 1 19.6 S09 7152 New (300) (1.5) 2 — d 1 2/14 27 20.8 N16 7155(2) New (200) (2) b — d 1 2/16 1

20.9 S06 7153 7113 1400 3 2 r 2 2 2/14 13 60 1 2 \ :

21.7 N09 7154 7108 2100 3.5 i / 2 2 2/14 14 160 5 b A l 22.6 N13 7170(2) New (200) (2.5) b — 2 1 2/28 1 22.6 S19 7159(2) New (100) (2) 2 — d 1 2/17 1 23.9 M0 2 7168 New (400) (2.5) b / 2 1 2/26 4 50 1 b r i

24.0 SOI 7160(2) New (200) (1.5) b _ d 1 2/20 1 24.5 N08 7161 7115 2500 3.5 b / 2 1 2/20 11 570 12 2 / 25.6 N12 7169(2) New (100) (1.5) b - d 1 2/27 1 26.3 S12 7166 New 400 1.5 b r~ d 1 2/24 2 26.9 N09 7162 New (300) (1) 2 - d 1 2/21 2

27.9 S09 7163 New (200) (1.5) b — d 1 2/23 2 28.0 S03 7172 New (600) (1.5) b ~\ d 1 2/29 2 29.0 N25 7164 (5) 800 2 2 ~\ 1 2/23 13 29.7 S05 7165 New (200) (1) 2 — a 1 2/23 3

coaacRCE - standards - bouloer

(1) Due to inclement weather conditions, no calcium plage data were secured at the McMath-Hulbert Observatory on February 6, 13, 18 and 19.

(2) These very small and ephemeral plages last for only one day. (3) Part of 7104. (4) New - in same position as old 7105. (5) New - in position of 7120.

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lib MT. WILSON MAGNETIC CLASSIFICATIONS OF SUNSPOTS

FEBRUARY 1961

COMMERCE STAND ^OS BOULDER

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Page 18: Reference book not to be tsken from theS39 New. 7158(2) 1.5. 200 . b . d. 12/17 19.6 (1.5) S09 . 7152 . New (300) 2 — 1. d . 2/14 27 20.8 (2) N16 . 7155(2) New 1 (200) b — d .

I

2

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4

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6

7

8

9

10

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I 2

I 3

14

I 5

I 6

17

18

19

20

2 I

22

23

24

25

26

27

28

29

INTERVALS OF NO FLARE PATROL OBSERVATIONS

KEBHIAItV 196+

HOUR-UT

I 2 3 4 5 6 7 8 9 10 I I 12 13 14 15 16 17 18 19 20 21 22 23 24

Observatories Included:

Arcetri Athenes Huancayo

Ikomasan Manila Istanbul Ondrejov Locarno Ottawa

Sacramento Peak

Ucc le Zurich

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I

2

3

4

5

6

7

8

9

10

I I

I 2

I 3

14

I 5

I 6

17

18

19

20

2 I

22

23

24

25

26

27

28

29

30

INTERVALS OF NO FLARE PATROL OBSERVATIONS

NOVEMBER 1963

III1

HOUR-UT

I 2 3 4 5 6 7 8 9 10 I I 12 13 14 15 16 17 18 19 20 21 22 23 24

«**~**— -

^ V

COMMERCE - STANDARDS BOULDER

Dservatories Include:

Dastumani rcetr i :henes ikou icharest

Capetown Capri-F Capri-S Climax Crimee

(German) (Swedish)

Haute-Provence Herstmonceux Huancayo Ikomasan Istanbu1

Kiev-KO Kodaikana1 Lockheed McMath-Hulbert Mitaka

Nizamiah Nizmir Ondrej ov Ottawa Sacramento Peak

Tackhent Ucc le Voroshilov

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Him IONOSPHERIC EFFECTS OF SOLAR FLARES

SHORT WAVE RADIO FADEOUTS SUDDEN PHASE ANOMALIES SUDDEN COSMIC NOISE ABSORPTION SUDDEN ENHANCEMENTS OF SIGNAL

SUDDEN ENHANCEMENTS OF ATMOSPHERICS SUDDEN FREQUENCY DEVIATIONS SOLAR NOISE BURSTS AT 18 Mc/s

.1 \N IR\ 1961

IMPORTANCE WIDE

SPREAD

INDEX

STATIONS KNOWN

SCNA SEA SPA SES SFO BUR FLARE

JAN UNIVERSAL TIME

1964 START END MAX

TYPE

SWF

IMP

No sudden ionospheric disturbances for January 1964.

COMMERCE - STANOAROS - BOULDER

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RIOMETER EVENTS

(Provisional)

111 n

JANUARY 1964

South Pole 26 Mc/s

JAN.

1964

START

UT

END

UT

MAX.

UT

MAX. ABSORP.

db,

(tenths)

NO.

OF

PEAKS

JAN.

1964

START

UT

END

UT

MAX.

UT

MAX ABSORP.

db, (tenths)

NO.

OF

PEAKS

2 0441 0328 0447 11 1 17 0805 1918 1541 9 2 2 0732 1458 1305 17 5 18 0159 0434 0217 13 2 2 1848 1952 1909 3 3 18 0938 1125 0959 4 1

3 0204 0355 0243 35 5 19 1450 1709 1604 12 1

3 0819 1611 1412 10 5 20 1021 1744 1431 5 2

3 1819 1950 1845 6 3 24 0341 0444 0358 7 2

4 0006 0345 0245 24 5 24 0946 2328 1446 7 2 4 1246 2008 1555 12 4 25 0044 0158 0109 10 2 6 0230 0359 0249 11 3 25 0602 0722 0613 4 1 7 0932 1624 1032 6 4 25 1857 1949 1940 3 1

7 1831 1941 1915 4 4 26 0212 0314 0220 13 1 8 0016 0054 0026 6 4 26 1241 2124 1950 6 4 9 0100 0204 0117 8 1 27 0116 0205 0133 23 2 9 1010 1019 1018 3 1 28 1916 1947 1932 5 1

10 0016 0217 0110 7 1 29 0620 1930 0958 10 3

10 0544 0742 0552 15 1 30 0304 0529 0311 5 3 10 1519 1744 1625 5 2 30 0740 1830 1434 12 3 10 2247 0107 2255 17 3 31 0856 2028 1105 23 2 11 1943 0308 0032 18 3

13 0249 0800 0256 7 2

14 0023 0126 0116 5 1

15 0106 0133 0127 3 2 16 0944 1230 1204 9 3 16 2257 2309 2301 3 1 17 0244 0324 0248 13 1

COMMERCE STANOAROS 0OULOER

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1 Va SOLAR RADIO EMISSION

OUTSTANDING OCCURRENCES

FEBRUARY 1961

ARO-OTTAWA 2800 Me/s

FEB.

1964

U R A N E

DESCRIPTIVE

TYPE

START

UT

DURATION

HRS. MIN.

MEAN

FLUX

MAXIMUM REMARKS

TIME FLUX

23 3 S imp le 3 1822 11 1826 1 0.5

23 3 Simple 3 1934 >26 1941 1.5 0.7

28 3 Simple 3 1401 42 1410 2 1

28 3 Simple 3 1531 1 36 Indet. 1 0.5

28 3 Simple 3 A 1734 2 16 Indet. 1 0.5 1 Simple 1 1851 0.8 1851.2 2 1

COMfctRCE - STAROAROS • BOULDER

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SO

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IVc SOLAR RADIO EMISSION

OUTSTANDING OCCURRENCES

FEBRUARY 1961

NBS BOULDER 108 Mc/s

No Outstanding Occurrences were observed during February 1964.

NOMINAL TIMES OF OBSERVATION

FEBRUARY 1964

NBS BOULDER 108 Mc/s

Feb. 1964

HOURS OF OBSERVATION

UT Feb. 1964

HOURS OF OBSERVATION

UT

1 1414-0004 16 1357-0022 2 1413-0005 1636-1825 17 1356-2326 3 1412-0006 18 1605-0024 4 1411-0008 1711-1726 19 1353-0025 5 1410-0009 20 1352-0026

6 1409-0010 21 1350-0028 7 1408-0011 22 1349-0029 8 1407-0012 23 2230-0030 9 1406-0014 24 1346-0031

10 1404-0015 25 1345-0032

11 1403-0016 26 1343-0033 12 1402-0017 27 1342-0034 13 1401-0018 28 1340-0036 2025-2040 14 1400-0019 29 1339-0037 1745-1758 15 1358-0021 1520-1529;

1805-1826

COMMERCE STANDARDS BOULDER

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SOLAR RADIO EMISSION SPECTRAL OBSERVATIONS

FEBRUARY 1964

High Altitude Observatory 7.6-41 Me/s Boulder

Date FEB.

1964

Bursts

Frequency Range (Mc/s)

Type Time (U.T.) Inten¬ sity

14 Feb III 1627:30-1628 1- 26-41

23 II 1902:45-1915:45 1 19-37 29 III 1745-1746:45 1 22-40

III 1752-1752:15 1- 32-40

COMMERCE - STANDARDS - BOULDER

Beginning with February 1964, the Boulder specto- graphic data times are given in hours, minutes and seconds to the nearest IF seconds.

IVd

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Va COSMIC RAY INDICES

(Climax Neutron Monitor)

IGC Station B 305

JANUARY 1961

Daily Jan.

Daily Jan. average average 1964 counts/hr* 1964 counts/hr*

1 3224.4 16 3244.3

2 3227.2 17 3246.1

3 3196.4 18 3251.9

4 3198.7 19 3255.5

5 3214.0 20 3239.7

6 3230.0 21 3258.4

7 3259.6 22 3272.8

8 3255.2 23 3263,4

9 3231.4 24 3254.2

10 3225.8 25 3236.8

11 3238.2 26 3238.7

12 3233.2 27 3243.2

13 3243.6 28 3245.8

14 3252.8 29 3227.3

15 3256.1 30 3219.8

31 3210.0

* Scaling Factor 128 COMMERCE STANDARDS BOULDER

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Via GEOMAGNETIC ACTIVITY INDICES

JANUARY 1964

Jan. 1964

C Values Kp

Sum Ap

Final

Selected

Days

Three hour Gr. interval

1 2 3 4 5678

1 0.4 lo 0+ 2- 2- 2- 2o 2+ 2- 12+ 6 Five

2 1.6 1+ 60 6+ 7- 5+ 5- 4o 3o 3 7+ 53 Quiet

3 1.1 4+ 4+ 3- 3o 3+ 4- 3+ 4- 28+ 21 4 0.9 4+ 4+ 3- 2o 3+ 3+ 3+ 3o 26+ 19 14

5 0.4 2+ 2+ 3- 1+ 2o 1+ 2+ 1+ 16- 8 15 21

6 0.1 2+ 2o lo 2- 1+ lo lo lo 11+ 5 22

7 0.5 Oo lo 2- 2+ 3+ 2o 2- lo 13o 7 27 8 0.5 1+ 1- 0+ 1+ 1+ lo 3- 3- 11+ 6

9 1.1 4o 4- 3- 3- 2o 3o 4- 5- 26+ 20 10 1.0 5- 5- 4o 2o 3o 3o 2- 4- 27- 21

li 0.2 3- 3- 2+ 2- 2o 2- 2o 2- 17- 8 Five

12 0.2 3o 2o 0+ Oo lo 1+ 2- 1+ 11- 6 Disturbed

13 0.1 2+ 3- lo 1- lo 0+ lo 2- 11- 6 14 0.0 1- Oo Oo 0+ Oo 0+ 0+ 0+ 2o 1 2 15 0.0 Oo Oo Oo Oo 1- 1- 0+ lo 3- 2 3

10 16 1.2 3- 3+ 3+ 5o 4o 5o 4o 3o 30+ 27 16 17 0.6 4o 4- 4+ 4- 3o 2- 2- 1+ 23+ 17 31 18 0.5 3- 2+ 2- 2- 1+ 1+ 3- 0+ 14o 7 19 0.5 Oo 0+ lo 0+ 2+ 2+ 4- 2o 12 0 7 20 0.2 3o 2o lo 2- 2- 1+ 1- lo 12+ 6

21 0.0 1+ lo 0+ Oo Oo Oo 0+ 0+ 3+ 2 Ten 22 0.1 2o 1+ lo 1- 1- 1+ 0+ 0+ 8- 4 Quiet

23 0,3 1- 0+ 0-t- 1+ 1+ 2o 1- lo 8- 4 24 0.9 2o 3o 2+ 3- 4- 2+ 2- 2+ 20o 11 6

25 1.0 4o 1+ 3o lo lo lo 4+ 5- 20+ 16 8 12

26 0.4 3+ 1- 1+ lo 2o 1- 2+ 2- 13 0 7 13

27 0.3 2o 0+ 1- 0+ 0+ 04- 2- 2- 7+ 4 14 28 0.7 lo 2+ 2+ 1+ 2o 1+ 3+ 3+ 17o 9 15

29 1.1 4- 4o 4o 3+ 4o 4- 3- 3- 28o 21 21 30 0.6 3+ 2o 2o 2o 3o 2+ 1+ 3- 19- 10 22

31 1.2 1+ 1- 1+ 5o 4+ 5o 5o 4- 26+ 26 23 27

Mean: 0.57 Mean; 12

COMMERCE STANDARDS BOULDER

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QU

AL

ITY

QU

AL

ITY

QU

AL

ITY

CRPL RADIO PROPAGATION QUALITY FIGURES AND FORECASTS Vllh

NORTH ATLANTIC

JAM! A in 1^61

— Short-term forecast | Range of reports ° Quality figure

DAY

NORTH ATLANTIC

DISTURBED -QUIET-

ACTUAL

COMPARISON

(SEE TEXT)

u[J

DISTURBED NORTH PACIFIC

ACTUAL

COMPARISON

(SEE TEXT)

QUIET

COMMERCE - STANDARDS BOULDER

Page 42: Reference book not to be tsken from theS39 New. 7158(2) 1.5. 200 . b . d. 12/17 19.6 (1.5) S09 . 7152 . New (300) 2 — 1. d . 2/14 27 20.8 (2) N16 . 7155(2) New 1 (200) b — d .

VI Ic USEFUL FREQUENCY RANGES - NORTH ATLANTIC PATH

JANUARY 1461

tfuT 3 6 9 12 15 18 21 24

COMMERCE - STANDARDS BOULDER

Page 43: Reference book not to be tsken from theS39 New. 7158(2) 1.5. 200 . b . d. 12/17 19.6 (1.5) S09 . 7152 . New (300) 2 — 1. d . 2/14 27 20.8 (2) N16 . 7155(2) New 1 (200) b — d .

USEFUL FREQUENCY RANGES- NORTH ATLANTIC PATH Vlld

JANUARY 196 J

tfuT 3 6 9 »2 15 18 21 24

Page 44: Reference book not to be tsken from theS39 New. 7158(2) 1.5. 200 . b . d. 12/17 19.6 (1.5) S09 . 7152 . New (300) 2 — 1. d . 2/14 27 20.8 (2) N16 . 7155(2) New 1 (200) b — d .

Villa IQSY ALERT PERIODS

INTERNATIONAL URSIGRAM AND WORLD DAYS SERVICE

FEBRUARY 196 I

FEB TIME

OF ISSUE

UT

ADVANCE GEOPHYSICAL ALERT

WORLDWIDE GEOPHYSICAL ALERT

1964

NO. TYPE TIMING ELABORATION

4 0400 34 Solar Calm Exists

13 1825 Ft. Belvoir, Magnetic Storm 13/03XX2

20 0400 35 Magnetic Calm Exists

23 0400 36 Solar Activity Exists

24 0400 37 Solar Activity Exists

25 0400 38 Solar Activity Exists

COMAfSCE - STANDARDS • BOULDER

On dates not listed above, the World-Wide Alert message was "IQSY GEQALERT NIL".

Page 45: Reference book not to be tsken from theS39 New. 7158(2) 1.5. 200 . b . d. 12/17 19.6 (1.5) S09 . 7152 . New (300) 2 — 1. d . 2/14 27 20.8 (2) N16 . 7155(2) New 1 (200) b — d .

USCOMtf-NeS-BL

Page 46: Reference book not to be tsken from theS39 New. 7158(2) 1.5. 200 . b . d. 12/17 19.6 (1.5) S09 . 7152 . New (300) 2 — 1. d . 2/14 27 20.8 (2) N16 . 7155(2) New 1 (200) b — d .