Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling...

60
IRPL-F2 Vi IT- J* % % IONOSPHERIC DATA ISSUED OCTOBER 1944 PREPARED BY INTERSERVICE RADIO PROPAGATION LABORATORY National Bureau of Standards Washington, D.C.

Transcript of Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling...

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IRPL-F2 Vi IT-

■J*

% %

IONOSPHERIC DATA

ISSUED

OCTOBER 1944

PREPARED BY INTERSERVICE RADIO PROPAGATION LABORATORY National Bureau of Standards

Washington, D.C.

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"This document contains information affecting the national defense

of the United States within the meaning of the Espionage Act,50 U.S.C.,

31 and 32. Its transmission or the revelation of its contents in any man¬

ner to an unauthorized person is prohibited by law.”

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IRPL- F 2 INTERSERVICE RADIO PROPAGATION LABORATORY issued NATIONAL BUREAU OF STANDARDS 31 Oct. 1944

WASHINGTON, D.C.

Organized under joint U.S. Communications Board

IONOSPHERIC DATA

This IRPI/-F-series report, issued monthly, serves as one ojf the three current supplements to IRPL Radio Propagation Handbook, Part 1, (War Dept. Till 1-499, tlavv Dept. DNC-13-1). The supplements of the IRPL-D series, "Basic Radio Propagation Predictions Three Months in Advance," issued earlier in the month, include basic prediction charts, auxiliary charts and nomograms, as well as examples illustrative of their use. The supplements of the IRPL-E series, "Radio Propagation Predictions One Month in Advance", include revisions two months later of certain of the predictions given in the D series, and nomograms giving predictions in a form for rapid operational use. Before Sept® 1944 most of the material was combined in the single report, "Radio Propagation Conditions".

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2

CONTENTS

TERMINOLOGY...Page 6 MONTHLY AVERAGES ANN IjIEDJAN VALUES OF .IONOSPHERIC DATA.Page 6

Monthly averages of critical frequencies, virtual heights and F2-layer maximum usable frequency factors; median values of highest frequency of Es reflections, and (graphical presentation only) percentage of total time of occurrence of Es above 3, 5, and 7 Me*

Provisional data (received by telephone or telegraph)

September, 1944 Baffin Is*, Canada *...Table 1 Fairbanks, Alaska •••• . ••••••••• Table 2 Reykjavik, Iceland ..* . • Table 3 Snainton, England.'••• Table 4 Great Baddow, England ..* * Table 5 Maui, Hawaii •••••••••••• . ••• Table 6 Trinidad, 3rit* West Indies ••••••••*...*• Table 7 Huancayo, Peru ..* Table 8 Brisbane, Q*, Australia * * *.*.. Table 9 Kerm&dec Is* * . * *.Table 10 Watheroo, W. Australia •••••• . . Table 11 Simonstown, Union of S* Africa ••••••* . Table 12 Mt. Stromlo, N*S.W*, Australia ••••• . Table 13 Christchurch, N.Z.*.. Table 14 Campbell Is* *.Table 15

August, 1944 Snainton, England •••. Table 16 Brisbane, Q*, Australia »•*; . Table 17 Mt* Stromlo, N*S*W., Australia ••••*••.•••• Table 18

Final data

September, 1944 Churchill, Canada ••••••••••••••*••• Table 19

Figs* 1 and 2 Ottawa, Canada •••••••• . , . , , Table 20

Figs* 3 and 4 Washington, D.C. *.. Table 21

Figs* 5 and 6 San Francisco, California * . Table 22

Figs* 7 and 8 Baton Rouge, Louisiana •••••• . * Table 23

Figs. 9 and 10 San Juan, Puerto Rico •••*..*.Table 24

Figs. 11 and 12

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3

August, 1944 Fairbanks, Alaska ......... . .... Table 25

Figs. 13 and 14 Churchill, Canada ............... Figs. 15 and 16 Burghead, Scotland .. Fig. 17

Final data are identical with provisional data presented in September issue of this report. Table 4.

Great Baddow, England ..Table 26 Figs. 18 and 19

Slough, England .. Table 26 Fig. 18

Ottawa, Canada ................ Figs. 20 and 21 San Francisco, California ..Figs. 22 and 23 Baton Rouge, Louisiana ..Figs. 24 and 25 Maui, Hawaii *. Table 27

Figs. 26 and 27 San Juan, Puerto Rico ..Figs. 28 and 29 Trinidad, Brit. West Indies • . Table 28

Figs. 30 and 31 Huancayo, Peru .... . ....... Table 29

Figs. 32 and 33 Kermadec Is. .................... Table 30

Fig. 34 Christchurch, N.Z. ................. Table 31

Figs. 35 and 36 Campbell Is. .................... Fig. 37

Final data are identical with provisional data presented in September issue of this report. Table 11.

July, 1944 Burghead, Scotland .

Sverdlovsk, U.S.S.R. • . . .

Tomsk, U.S.S.R. .......

Great Baddow, England ....

Slough, England ....... Baton Rouge, Louisiana ... Delhi, England ....... Brisbane, ££., Australia ...

Kermad ec Is. ........ Mt. Stromlo, N.S.W., Australia

, N.Z. .....

. . Fig. 38

. . Table 32 Figs. 39 and 40

. . Table 33 Figs. 41 and 42

. . Table 34 Figs. 43 and 44

. . Fig. 43

. . Tab 1 e 35

. . Table 36

. . Table 37 Figs • 45 and 46

. . Fig. 47

. . Table 38 Figs. 48 and 49

, . Table 39 . . Fig. 50

Christchurch Campbell Is.

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OT I

June, 154 .

Fairbanks, Alaska ......

Reykjavik, Ireland ..... Churnhi11, Canada .

Great Baddcu, Sngland ....

Maui, Hav./aii ........

Trinidad, Brit, est Indies .

Brisbane, Australia . . .

Watheroc, W. Australia . . .

At. Stroiiilo, K.S.W., Australia Christchurch, W.Z. .....

icy, 1944 Rather oo, W. Australia . . .

April, 1944

Ratheroo, W. Australia

March, 1944

Ratheroo, W. Australia

Figs . 51 and 52

Figs. 53 and 54

Figs . 55 and £6 Figs.

•" ry <U ; and 58

Figs . 59 and 60 Figs. 61 and 62

Figs. 63 and 64 Figs. 65 and 66 Figs. 67 and 68 Figs. 6S and 70

Table 40 Figs. 71 and 72

Figs. 73 and 74

Figs. 75 and 76

I0N08FHZRIC RATA FOR EVERY DAY A1\D HOUR.

September, 1944 Washington, D.C.

h'F? ... f°F2 . h' FI . f°Fl ..... h1S . f»3 .. . As ....

Ft-1115 CO .. F2-M3000.. .. F C-*- ji ioo 00 .... . ................ F1-A1500 . 3-M15C0...

• Page 8

Table 41 Tab 1 e 4 a

Table 43

Table 44

Table 45

Table 48

Table 47

Table 48

Table 45

Table 50

Table 51

Table £5

0NC3IHERE DISTURBANCES... Fage 5

Ionospheric storminess . .. Table 53

Ionospheric character and principal storms observed

at ;ashingtcn, D.C., September, 1944.

Agu -til c haracter

icden Ionosphere Disturbances. - None observed at

Washington, D.0., during September.

Page 9

Tage o

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TERMINOLOGY

Note.- The following symbols are used, conforming to the recommenda¬

tions of the International Radio Propagation Conference held in Washington,

D.C., 17 April to 5 May 1944.

f °F2

f °F1

f°E

h' F2

h' F3

h'E

fEs

ordinary-wave critical frequency for the F2 layer. The term night F

layer will no longer be used. The term F2 layer is new used for

the night F layer as well as the daytime F2 layer.

ordinary-wave critical frequency of the Fl layer.

ordinary-wave critical frequency of the E layer.

minimum virtual height of the F2 layer.

minimum virtual height of the Fl layer.

minimum virtual height of the E layer.

highest frequency of Es reflections.

M - maximum usable frequency factor, to be followed by he distance in km.

Example: M3500 represents 5500-km maximum usable frequency factor.

muf - maximum usable frequency.

[ ] - interpolated value.

( ) - doubtful value.

A

B

C

- characteristic not measurable because

- characteristic not measurable because

absorp^ion.

- characteristic not measurable because

interference.

of blanketing by sporadic

of loss of trace due to

of equipment failure ^r

D - characteristic higher than upper limit of recorder.

E - characteristic less than lower limit of recorder.

F - spread echoes.

G ~ f°F2 ^ f°Fl. ^ x

H - stratification observed within region.

J - ordinary-wave critical frequency deduced from measured extraordinary-

wave critical frequency.

K - ionosphere storm in progress.

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6

MONTHLY AV3RAC-ES AND MEDIAN ‘VALUES OF IONOSPHERIC DATA ,

The tables and graphs of ionospheric data, presented here are

■■ s sent led by the Interservice Radio Propagation Laboratory for analysis

and correlation principally incidental to IRFL predictions of radio

propt nation conditions. These data are furnished by the following:

Carnegie Institution of Washington (Department of Terrestrial Magnetism).

Baffin Is., Canada

Fairbanks, Alaska (University of Alaska, College, Alaska)

Reykjavik, Iceland

Maui, Hawaii

Trinidad, Brit. West Indies

Huancayo, Peru

Wa th er o o, V'i „ Au s t.r a 1 i a

British Rational Physical Laboratory, and Inter-Services Ionosphere Bureau.-

Radio Research Station, Slough, England

Great Baddow, England

Burghead, Scotland

Delhi, India

Australian Council for Scientific and Industrial Research.

Radio Research Board, Australia

Brisbane, Australia I/ft. Stromlo, Canberra, NSW, Australia.

Canadian Department of National Defence, Naval Service.

Churchill, Canada

Ott awa, Canada.

New Zealand Radio Research Committee.

Kermadec Is.

Christchurch (Canterbury University College Observatory)

Campbell Is.

Peoples’ Commissar for Postal arri Electric Communications, Mosccw,U.S.S.R.

Tomsk, U.S.S.R.

Sverdlovsk, U.S.S.R.

National Bureau of Standards, Washington, D.C.

Stanford University, (San Francisco), California.

Louisiana State University, Baton Rouge, Louisiana.

University of,Fuerto Rico, San Juan, P.R.

For their timely value, some of the tables presented are provisional

data received by telephone or telegraph in which there may be small or

infrequent errors. "Then final values are available such errors will be

corrected in later issues of this report.

The final values presented, both in tabular and graphical form,

although correct for the quantities stated, as reported to this laboratory.

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may sometimes lead to an erroneous conception cf typical values for the

quantity under consideration. Standard scaling practice, following recom¬

mendations of the International Radio Propagation Conference held in Wash¬

ington, D.C., 17 April to 5 May, 1944, is not yet universal, deviation

from standard practice being most common in the cases of records where

spread echoes are present. Even when standard scaling practice is used,

intrinsically misleading results may arise from the monthly average being

determined from only a few observations during the month. Two frequent

types of such error, both particularly typical of stations in far northern

or far southern latitudes are;

(a) Erroneously high values of monthly average critical frequencies

caused by the frequent absence of record for cases where the critics.l

frequency is below the 1 aver frequency limit of the recorder. A

median, rather than a mean, value of the critical frequency is more

significant in such cases, the median being that for all times at

which observations were made, the cases of such inability to read the

records being counted as less than the lower frequency limit of the

apparatus.

(b) Erroneously high values of monthly average F2-layer critical fre¬

quencies caused by the frequent occurrence of cases where the Fl-layer

critical frequency exceeds that of the F2-layer. This is characteristic

of summer months during sunspot-cycle minimum, particularly in northern

latitudes. In this case, also, median values are more significant than

mean values, the median being that for all cases where observations are

made, those cases where missing values result because of higher f°Fl

being counted as less than the f°Fl. When, as is often the case, no

great discrepancy is lilely to exist between f°Fl and f°F2, a typical

value of f°F2 may be obtained by taking the monthly average of observed

f°F2 together with observed f°Fl for the cases where no f°F2 could be

measured.

The discrepancy between predicted ard observed values of monthly

average critical frequencies, particularly for far northern stations,

is frequently because of the above reasons, the predictions being in¬

tended to represent typical values for the location under consideration.

It may be noted by inspection of the figures presenting comparison

of data received for the months of August, September, and October with

IRPL predictions made four months in advance, that, generally, the pre¬

dictions have been in error by being too lev/, especially in temperate

latitudes.

These predictions are based on average trends of color activity as

measured by sunspot number. In the past few months this activity has

been somewhat abnormally high. Occurrence of both sunspots and calcium

flocculi during the past few months has been slightly more frequent at

high than at low solar latitudes, indicating that perhaps the sunspot

minimum has just been passed.

Because of great fluctuations in solar activity, however, an observa¬

tion period of but a few months is so short as to render a final conclu¬

sion as to this premature as yet.

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IONOSPHERIC DATA FCR EVERY DAY AND HOUR

These data, observed at Washington, D.C., follow the scaling prac¬

tices recommended by the International Radio Propagation Conference held

in Washington, D.C., 17 April to 5 May 1944.(Cf. IRFL-C61, pp.36-39).

In order to obtain typical values of monthly average f°F2, for

cases where the f°F2 falls below the f°Fl, values of f°Fl are used in

taking the average, such cases being indicated in Table 42 by the

symbol G, and a "less than" sign before the f°Fl value inserted.

Because of the high variability of observed fEs, mean values are

of little practical significance and are not given here.

Mean values of other quantities are given for all days of the month

as well as for quiet days only. The criteria for selecting periods of

ionospheric storminess, whose data are deleted in obtaining the mean

values for quiet days only, are presented in IRPL-R5, "Criteria for Iono¬

spheric Storminess", available to authorized persons upon request to the

Chief of IRFL, National Bureau of Standards, Washington 25, D.C.

In determining the median values included in Tables 41 through 52,

the following procedure has been adopted:

For all characteristics: Where the value is missing because of A,

B, or C (see Terminology, above), that hour is omitted from the median

c ount.

In addition.

For critical frequencies;

For all layers, where a value is missing because of E

(see Terminology, above), it is counted as less than the

lower limit of the recorder.

Where a value of f°F2 is missing because of G (see Ter¬

minology, above), it is counted as less than the f°Fl value

for the same time.

Where values of f°E and f°Fl are missing at the beginning

or end of the diurnal curve, they are counted as less than

the median frequency.

For virtual height:

Where a value of h'F2 is missing because of G (Cf. preced¬

ing section. Terminology, of this report), it is counted as

greater than the median value.

For all virtual heights, values missing for any other reason

than that given in the preceding paragraph are omitted from the

median count.

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Fcr muf factors; Values missing fcr any reason are omitted from the

median count.

IONOSPHERIC DISTURBANCES

Table 53 presents ionospheric character figures and principal storms

observed at Washington, D.C., during September 1944, as determined by the

criteria presented in IRI-L-R§, .cited above, together with American mag¬

netic K-figures which are usually covariant with them.

ERRATA

1. In the previous (September) issue of this report, the designations

of the month were omitted from two tables of data presented, although proper

designation was given in the table of contents. Table 4 should be desig¬

nated "August, 1944". Table 20 should be designated "July, 1944."

2. In the September issue of this report. Table 10, the values given

in'the columns for'h'FI and h’E should be interchanged.

3. In the September issue of this report, the value of noon h'F2 for

Slough,-'England, as given at the end of Table 20, is erroneous and should

be deleted.

4. In the September issue of this report, heading of Table 40, the

value of Eo for 1 mile should bo " = 2460 millivolts per meter."

ADDENDA

In the September issue of this report. Tables 10 and 25, the times

of reporting data from Christchurch, N.Z., should be those of 172.5CE.

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Tim

ei

90°7

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Tim

ei

Lo

oai.

L

ength of

tim

e

sweep

i 1.9

Mo

to

9.8

Mo

in th

ree m

inu

tes

thir

ty

seconds.

Length

of

tim

e sv

eepi

3 M

o to

12

Mo

in ele

ven m

inute

s.

Reo

ord

cen

tere

d

Reco

rd cen

tere

d

on th

e h

ou

r.

on th

e h

ou

r.

Page 18: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

(C

orrecti

on

s

an

d

addit

ions

to previo

usly is

sued

pro

vis

ion

al

data

)

Table

26

Fair

banks,

Ala

sk

a

(64

.9°N

, 147.8

°^)

August,

19

44

Gre

at

Bad

do

w,

En

gla

nd

(51

.7°N

, 0

.5°E

) A

ugust,

1944

«?

v «>

h.

s "a

cvit»-HN^u)ioOt'Oioono

§HC'JW^lfl(Ot'CDO>OH(\JlO^U)tOt'COO)OHCjW OOOOOOOOOHHHHHHHHHHNNNN

I

Tim

e i

150°W

. T

ime

i

60°V

T.

Length of ti

me

sw

eeps

2

Mo

to

16

Mo

in

one m

inu

te.

Length

of

tim

e

sw

eep

s

2

Mo

to

16

Mo

in one m

inute

Page 19: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

(Co

rrecti

on

s

ami

ad

dit

ion

s

to pre

vio

usly is

su

ed

pro

vis

ion

al

data

) (C

orr

ecti

on

s

to pre

vio

usly is

su

ed p

rov

isio

nal

data

)

Tim

ei 1

72

.5°E

. L

ength

of ti

me sw

eep

: 2

.5

Mo

to

12

Ifc

in

-tw

o m

inute

s

Page 20: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

Tab

le

34

Table

33

Gx

*ea

t B

addosv

, E

ng

lan

d

(51

«7

°N,

5°E

) O

foM

k,

US

SR

(56e

40K

»

85®

0°E

) July

, 1

94

4

Ju

ly,

1944

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IS} lO «5 to O)lflHo)tDffl®Nl0®roOHHwOffieDN8>»t'®OH ©9©ee©®see

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Page 21: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

Table 35

(Corrections to data previously issued

in "ionospheric Data", issued August 1S44) Table 36 Table 37

Baton Rouge, Louisiana July, 1944

(30.6°N, 91.2°W) Delhi, India

July

(28.6'3K, 77.2°e)

, 1944

Brisbane, Q., Australia (27.5°8, 153.0°E)

July, 1944

Time F2-M3000 Time f°F2 Time fEs

00 3.0 00 3.54 00 01 3.0 01 3.61 01 02 3.1 02 3.50 02 2.6

03 3.1 03 3.32 03 2.5 04 3.1 04 3.17 04 05 3.2 05 3.34 05 06 3.2 06 4.22 06 07 3.0 07 5.28 07 08 3.1 08 6.90 08 09 3.0 09 6.27 09 10 3.1 10 6.76 10 11 3.0 11 7.07 11 12 3.0 12 7.03 12 3.0

13 2.9 13 7.50 13 14 3.0 14 7.64 14 3.8

16 3.0 15 7.51 16 3.9 16 3.1 16 7.06 16 4.0 17 3.2 17 6.75 17 3.7

18 3.2 18 6.65 18 19 3.2 19 6.70 19 20 3.3 20 5.78 20 21 3.2 21 5.42 21 22 3.1 22 4.52 22 23 3.0 23 4.15 23

Times 90°W. Time s 75 °E. Time s I50°E. Length of time sweepi 1.9 Its to 9.8 Mo in

three minutes, thirty seoonds. Record centered on the hour.

length of time sweeps 2.2 Me to 12.5 Mo in two minutes, thirty seconds.

Table 38 Table 39

Table 40

Mt. Stromlo, N.S.W., Australia Watheroo, Western Australia (35.3°S, 149.0°E) Christohurch, N.Z. (43.§°S, 172.6°E) (30.3°S, 115.9°E)

July, 1944 July» 1944 May. 1944

Time fEs Time fEs Time fEs

00 00 4.0 00 2.9

01 01 4.0 01 2.9

02 02 4.2 02 2.8

03 03 3.6 03 2.8

04 04 04 2.9

06 06 3.2 06 2.9

06 06 06 2.9

07 07 07 2.8

08 08 08 2.9

09 09 09 3.1

10 10 4.4 10 3.1

11 3.8 11 4.5 11 3.7

12 3.9 12 6.1 12 . 3.4

13 4.3 13 5.0 13 3.5

14 4.0 14 5.2 14 3.8

15 4.0 15 4.7 15 3.1

16 16 3*6 16 3.2

17 17 4.0 17 3.0

18 18 3.7 18 3.0

19 19 3.4 19 2.9

20 20 20 2.8

21 21 21 2.8

22 22 22 2.8

23 23 23 2.8

Time s 150°E. Times 172.5°E. Times 120°E.

Length of time sweeps 1.6 Me to length of time sweeps 2.5 Me to 12 Ms length of time sweeps 16 Me to 12.5 Me in two minutes. \ in two minutes. 0.5 Me in fifteen minutes.

Page 22: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

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Page 34: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

Table 53

Ionospheric Storminess, September, 1944

Day Ionospheric 00-12 GCT

Characters 12-24 GCT

Principal Storms Beginning End

GCT GCT

Magnetic Oharacter^ 00-12 GCT 12-24 GCT

September 1 2 2 2130 ————7^ 3 2 2 4 4 —— 2200 ' 4 3 3 3 2 2 1 4 3 2 1 2 5 2 1 2 1 6 1 1 1 2 7 2 2 2 1 8 2 2 2 2 9 1 1 2 1

10 2 3 2100 —- 2 2 11 4 2 —— 1000 2 2 12 2 2 3 2 13 2 1 1 2 14 1 1 2 2 15 1 2 Z 0 16 1 2 1 1 17 1 1 1 2 18 1 2 2 2 19 2 1 1 1 20 2 0 1 3 21 ♦♦♦ 2 3 2 22 2 3 2 2 23 1 1 2 2 24 3 3 4 3 25 1 1 2 2 26 2 2 2 2 27 3 2 2 2 28 2 1 2 1 29 2 2 2 1 30 2 4 1100 2100 2 4

♦Ionosphere character figure (I-figure) for ionospheric storminess at 'Washington, D.C#, during 12-hour period, on an arbitrary scale of 0 to 9, 9 representing the greatest disturbance#

♦♦Average for 12 hours of American magnetic K-figure, determined by a number of observatories, on an arbitrary soale of 0 to 9, 9 rep¬ resenting the greatest disturbance#

♦♦♦No record. ^bashes indicate continuance of ionospheric storminess#

Page 35: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

00 02 ^4 06 08 10 12 14 16 18 20 22 00

Fig 3 OTTAWA, CANADA

45 5°N, 75 8° W SEPTEMBER, 1944

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-LIMITING FREQUENCY= 3 Me

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Fig 4 OTTAWA, CANADA SEPTEMBER ,1944

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00 02 04 06 08 10 12 14 16 18 20 22 00

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Fig 6 WASHINGTON, DC SEPTEMBER, 1944

00 02 04 06 08 10 12 14 16 18 20 22 00

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LIMITING FREQUENCY ■ 3 Me

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Fig 8 SAN FRANCISCO, CALIFORNIA SEPTEMBER ,1944

Page 37: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

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Fig. 10 BATON ROUGE j LOUISIANA SEPTEMBER ,1944

Page 38: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

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Fig 13 FAIRBANKS, ALASKA

649°N, 1478° W AUGUST, 1944

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Fig 14 FAIRBANKS, ALASKA AUGUST, 1944

Page 39: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

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BADD0W, ENGLAND AUGUST 1944

Page 40: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held
Page 41: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held
Page 42: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held
Page 43: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

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Page 44: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

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Fig.36 CHRISTCHURCH, NEW ZEALAND AUGUST, 1944

Page 45: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

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Fig 38 BURGHEAD, SCOTLAND

57 7 ° N , 3 5° W JULY, 1944

Page 46: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

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Fig.44. GREAT BADD0W, ENGLAND JULY, 194-4 ;

Page 47: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

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52.0°S, 169 0°E JULY, 1944

Page 49: Ionospheric Data - nvlpubs.nist.gov · These data, observed at Washington, D.C., follow the scaling prac¬ tices recommended by the International Radio Propagation Conference held

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Fig.52 FAIRBANKS, ALASKA JUNE , 1944

Fig 53 REYKJAVIK, ICELAND

64 |°N, 21 7° W JUNE ,1944

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Fig 54 REYKJAVIK, ICELAND JUNE, 1944

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E

LOCAL TIME

Z p' /

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<s

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1

10

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\ /

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f 1 / '

—7 J LZ

00 02 04 06 08 10 12 14 16 18 20 22 00

-LIMITING FREQUENCY = 3 Me

--LIMITING FREQUENCY1 5 Me

-LIMIT ING FREQUENCY = 7 Me

Fig 56. CHURCHILL, CANADA JUNE ,1944

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00 02 04 06 C8 10 12 14 16 16 20 22 00

-LIMITING FREQUENCY = 3 Me

-LIMITING FF<£QUENCY =5 Me

-LIMITING FREQUENCY =7 Me

Fig 62. TRINIDAD, 8R1T. WEST INDIES JUNE, 1944

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14 16 18 20 22 00

a 06 08 10 12 14 16 18 20 22 00

Fig 69 CHRISTCHURCH, NEW ZEALAND

435°S, 172 6°E JUNE. 1944

00 02 04 06 08 10 12 14 16 18 20 22 00 5 *

Z 400

Ul I

F2

200 FI

H 100 £T >

100 LOCAL T IME

90 .

uj O S z

70 / -iS / g£ 60 /

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J V 7 7 Al

T r y

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z CL U. t / /

1 1 11 \ C\

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20 tv /

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1

L —L jii \i A T \ \

10 i \ i A V r > \ V i'i r i \ rr l\ . 1

\ / \ ft*.

h i— J. t ll \ 1 ri 1/ V / ii \ V .

00 02 04 06 08 10 12 14 16 18 20 22 00

Fig 70

-LIMITING FREQUENCY

— LIMITING FREQUENCY

— LIMITING FREQUENCY

CHRISTCHURCH,

= 3 Me

= 5 Me

= 7 Me

NEW ZEALAND JUNE, 1944

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00 02 04 06 08 10 12 14 16 18 20 22 00

2 —

Z 400

h- X 300 o IxJ \ X 200 J

-FI

<

\

> 0

100 LOCAL TIME

90

LdO 52

jO

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A

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10 * \ A /

r 1 \ V L-> 7 ' X J / Y \ A k

V \ / / 7 \ \ i r

■ “

00 02 C4 06 08 0 1 2 14 16 1 8 20 22 00

LIMITING FREQUENCY - 3 M

— LIMITING FREQUENCY 5 Me

- LIMITING FREQUENCY 7 Me

Fig.72 WATHER00.W AUSTRALIA MAY. 1944

00 02 04 06 08 10 12 14 16 18 20 22 00

5 X.

Z 400

h- x 300 O

UJ

F2 —

-1- 200 _J <

^ 100

tr

FI

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ING

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V 00 02 04 06 08 10 12 14 16 18 20 22 00

-LIMITING FREQUENCY = 3 Me

-LIMITING FREQUENCY = 5 Me

-LIMITING FREQUENCY = 7 Me

Fig 74 WATHER00.W AUSTRALIA APRIL.I944

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IRPL REPORTS

Daily-

Telephoned and telegraphed reports of ionospheric, solar, and magnetic data from various places.

Warnings of ionospheric disturbances.

Weekly

IRPL-J. Radio Propagation Forecast.

Monthly

IRPL-D. Basic Radio Propagation Conditions - Three months in advance. IRPL-E. Radio Propagation Predictions - One month in advance. IRPL-F. Ionospheric Data.

Bimonthly

IRPL-G. Correlation of D.F. Errors with Ionospheric Conditions.

Quarterly

IRPL-A. Recommended Frequency Bands for Ships and Aircraft in the Atlantic

and Pacific. IRPL-B. Recommended Frequency Bands for Submarines in the Facific. IRPL-K. Best Radio Frequencies for Aircraft and Ground Stations in the

Atlantic. IRPL-M. (WIMS APPENDIX N) Frequency Guide for Merchant Ships.

Semiannual

IRPLr-H. Frequency Guide for Operating personnel.

Special Reports, etc.

IRPL Radio Propagation Handbook, Part 1. IRPL-Cl through C61. Reports and papers of the International Radio Propa¬

gation Conference, 17 April to 5 May 1944. IRPL-R. Unscheduled reports.

Rl. Maximum Usable Frequency Graph Paper. R2 and R3. Obsolete. R4. Methods Used by IRPL for the Prediction of Ionosphere Characteris¬

tics and Maximum Usable Frequencies. R5. Criteria for Ionospheric Storminess. R6, Experimental studies of ionospheric propagation as applied to a

navigation system. IRPL-T. Reports on Tropospheric Propagation.

Tl. Radar Operation and Weather. T2a. Radar coverage and weather.

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