ionospheric data - nist...h»f2 ..table 51 fop^ .tables 52 and 53 h»fl .table 54 f fl .table 55...
TRANSCRIPT
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IK PL-F13
IONOSPHERIC DATA
ISSUED
SEPTEMBER , 1945
PREPARED BY INTERSERVICE RADIO PROPAGATION LABORATORY National Bureau of Standards
Washington, D.C.
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IRPL-F13 INTERSERVICE RADIO PROPAGATION LABORATORY Issued NATIONAL BUREAU OF STANDARDS 20 Sept. 1945
WASHINGTON, D.C.
_ Organized under Joint U.S. Communications Board
IONOSPHERIC DATA CONTENTS
TERMINOLOGY AND SCALING PRACTICES . • . . o . . , . , *.'pag# 4 MONTHLY AVERAGE AND MEDIAN VAJLES OF IONOSPHERIC DATA.Pag® 5
. Provisional data (recoivad by telephone or telegraph)
August 1945 Baffin I*, Canada (Median values) Table 1 Churohill, Canada (Median values) •»•».»*»«•,• Table E Prince Rupert, Canada (Median value®) e«eo6»»e».9 Table 3 St* John*s, Newfoundland (Median values) •••
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2
Final data
July 1945 Prince Rupert, Canada (liedian values) • • • . .
Victoria Beach, Canada (Median values) • • . •
St. John’s, NewTound lard (Median values) . • •
Ottawa, Canada (Median values)
Boston, Massachusetts (Median values) • • . . •
San Francisco, Calif, (’.fedian values) « * . . .
Baton Rouge, Louisiana (Median values) . . . .
San Juan, Puerto Rico (Median values) . . . . .
Christmas I. (Median values) .........
Huancayo, Peru (Median values).
June 1945 BaJf'in I., Canada (Median values).
Reykjavik, Iceland (Median values) ......
Biarghead, Scotland (Median values) ..
Slough, Englaral (Median values) «».....
St. John’s, Newfourdlard (Median values) . . .
Colombo, Ceylon (Median values) .......
Christchurch, N.Z. (Median values).
!ja.y 1945 - Baffin I., Canada (Median values) ......
Reykjavik, Iceland (Median values)
Burghead, Scotland (Median values) ......
Colombo, Ceylon (Median values) •...•••.
Siraonstown, Union of 3. Africa (Median values)
. . . Table 26 Figs. 7 and 8
. . . Table 27 Fig. 9
, , . Table 28 Figs. 10 and 11
. e » Table 29 Pigs. 12 and 13 ... Table 30
Figs. 14 and 15 , . . Table 31
Figs. 16 and 17 . . , Tabio 32
Figs. 18 and 19 ... Table 33
Figs. 20 and 21 . . . Table 34
Figs. 22 and 23 . . . Table 35
Figs. 24 and 25
. Table 36 Figs, 26 and 27 . Table 37
Figs. 28 and 29 . . . « c . Table 38
Pig. 30 ..Table 39
Fig. 31 »...«. Table 40
Figs. 32 and 33 ....... Table 41
Pigs. 34 and 35 . Table 42
Figs, 36 and 37
. , . Table 43 Pigs. 38 ard 39
, , , . Table 44 Figs. 40 and 41
. . . Table 45 Fig. 42
• • • Table 46 Figs. 43 6uid 44
, . , . Table 47 Pig. 45
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3
Final data
April 1945 Baffin I*, Canada (Median values) . Table 40
Fijs. 46 and 47
Ijarch 1945 Baffin I., Canada (Median values).. Table 49
Fij^s. 48 and 49 Trinidad, Brit, i'l,Indies, (Median values) «,...••• Table 50
Figs, 50 and 51
I0N0SPH3RIC DATA FOR d'/SRY -DAY AND F.OUR .. Page 7
August 1945 V/ashington, D,C.
h»F2 ..Table 51 fOp^ .Tables 52 and 53 h»Fl .Table 54 f°Fl .Table 55 h‘E .Table 56 f°E .Table 57 £s Table 58 F2-:il500 .Table 59 F2-M3000 .. Table 60 Fl-MSOOO . Table 61 3-M1500 Table 62
lONOSPIISPdi DISTURBANCES. Page 7
Ionospheric storminess . * . Table 63 Ionospheric character and principal storms observed
at V'fashington, U.C., August 1945,
Sudden Ionosphere Disturbances . ,, Table 64 Observed at Vvashington, D.C,, during August 1945,
Radio Propagation ^^uality Figures, Compared with IRFL and ISIB Warnings, and IRPL A~Zone Forecasts, ^
North Atlantic and North Pacific quality figures, July 1945, provisional Table 65
PREmiNARY REPORT ON IONOSPHERIC DATA FOR SOLAR ECLIPSE, 9 JULY 1945 .’. Page 8
Ionospheric data for solar eclipse, 9 July, and for control days, 6 July through 12 July, Boston, ITassaohusetts , , , , , Fig* 52
Ionospheric data for solar eclipse, 9 July, and for control days, 2 July throigh 17 July, San Francisco, Calif,.Fig, 53
Ionospheric data for solar eclipse, 9 July, and for control days, 4 July through 15 July, Baton Rouge, Louisiana • , , , Fig, 54
Ionospheric data for solar eclipse, 9 July, and for control
days, 6 July through 16 July, San Juan, Puerto Rico . , , , Fig, 55 -
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4
ERRATA Page 10
TERMINOLOGY AND SCALING PRACTICES
The symbols and teminology used in this report are those adopted by the International Radio Propagation Conference, and given in detail on pages 24 to 26 of the report IRPL“C61, "Report of International Radio Propagation Conference", and in the Section on "Terminology", in reports IRPL-Fl, 2, 3, 4, 5.
In the past, ionospheric conditions were summarized on a monthly basis by using average or mean values, for each hour of the day, for each month. However, following the recommendations of the International Radio Propa¬ gation Conference, held in Washington 17 April to 5 ii
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d© For sporadic E (Es)* ' Values of fEs missing because no Es reflections appeared^ the
equipment functioning normally otherwise's are ocu^ited as equal to or less than the lower limit of the rsooi^er©
Values of fEs missing for any other reasouj, and values of hSs missing for any reason at all, are omitted from the median count©
MONTHLY AVERAGE AND MEDIAN VALUES OE IONOSPHERIC DATA
The ionospheric data given here in graphical and tabular form were assembled by the Interservice Radio Propagation Laboratory for analysis and correlation, incidental to IRPL predictions of radio propagation conditions© The following are the sources of the datas
Australian Council for Scientific and Industrial Research Radio Research Board, Australia Brisbane, Q., Australia
, Mt© Stromlo, Ca.nbarra, NSW, Australia Cape York, Q., Australia©
British National Physical Laboratory, and Inter-Senrioes Ionosphere Bureau Radio Research Station, Slough, England Great Baddow, England Burghead, Scotland Delhi, India i&idras, India Simonstovra, Union of S. Africa Colombo, Ceylon.
•
Canadian Radio Wav® Propagation Conmittee Churchill, Canaria Ottawa, Canada St© John^s, Newfoundland • Prince Rupert, Canada Victoria Beach, Canada
New Zealand Radio Research Committee Kermadec Is© Christchurch (Canterbury University College Observatory) Campbell I© Pitcairn I® Rarotonga l©
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6
Interdepartnent Ionosphere Bureau, U,S*3.R. Scientifio Experiiaental Institute of Terrestrial liagnetism, Moscow, U.S.S.R.
Tykhi Bay, U.S.S.R, Tomsk, U«S«S«R» Sverdlovsk, U.S.S.R. Moscow, U.S.S.R. ' Leningrad, U.S.S.R. Alma Ata, U.S.S.R.
Carnegie Institution of 'Washington (Department of Terrestrial Magnetism) Baffin I., Canada Christmas I. Fairbanks, Alaska (University of Alaska, College, Alaska) Reykjavik, Iceland Ifeui, Hawaii Trinidad, Brit. West Indies Huancayo, Peru Watheroo, W. Australia
United States Array Signal Corps Leyte
llational Bureau of Standards Washington, D.C.
Stanford University, San Francisco, California
Louisiana State University, Baton Rouge, Louisiana
University of Puerto Rico, San Juan, P.R.
Harvard University, ^ ■ Boston, Ifess.
The tables of ’’provisional data” give values as reported to the IRPL by telephone or telegraph. Any errors in these values will be corrected in later issues of the F-series reports. In-^final data tabulations, any omission of values previously given in provisional tabuletiona is indi¬ cated by a dash.
The tables and graphs of "final data" are correct for the values reported to the IRPL, but, because of variations in practice in the in¬ terpretation of records and scaling and manner of reporting of values, may et times give an erroneous conception of typical ionospheric charac¬ teristics at the station. Some of these errors are due to*
a. Differences in scaling records where spread echoes are present.
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7
b» Omission of values where f°F2 is less than or equal to f°Fl, lead¬ ing to erroneously high values of monthly average or median values,
c. Omission of values where critical frequencies are less than the lower frequency limit of the recorder, also leading to erron¬ eously high values of monthly average or median values, ■
These effects were discussed on pages 6 and 7 of ’the previous F-series reports, IRPL-Pl, 2, 5, 4, and 5, Discrepancies betv/een predicted and observed values are often ascribable' to these effects.
IONOSPHERIC DATA FOR EVERY DAY AND HOUR
These data, observed at
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8 PRELIMINARY REPORT ON IONOSPHERIC DATA
FOR SOLAR ECLIPSE 9 JULY, 1945
^ The solar eclipse of 9 July 1945 was notable in that, althou^^h it was of shorter duration and sauewhat narraver path than the average, its cover- aga by ionospheric measurements was undoubtedly more complete tixan that for any other• This vws not only because of the recent establishment of addi¬ tional ionosphere stations, but principally because the path of the oclinse xay in the geographical regions wnere regular observing stations, L'jarry of long standing, were located in greatest proximity.
r
The duration of the eclipse was between about 1200 to 1600 GCi, tlxe patn oi totality'’ beginning near Spiscj Idaho, and , ending near Taslikent, U.S.o.Pi. The partial phase was visible over practically all of the hcrti American continent, ail of 2urbpe, and the nortlwrest and northern part of Asia.
h
I.5aps showing the path of the eclipse, as well as tables 'giving the elements, local circumstances, and other pertinent data, are given in ’’The ionerican Epheneris and h’autical Almanac”, 1945, p.325, 529-353, and, more completely, in the supplement to this, ”Total Eclipse of the Sun, July 9, 1S45,” both issued by the U.S* Faval Observatory, Washington, b.C.
Solar activity during the eclipse period was rather low, thus insuring data for the eclipse aay, as well as control data for a period before and after the eclipse day, reasonably free from effects other than those due to solar obscuration. Three spot groups of Im activity were reported by Mt. //ilson Observatory, their heliographic latitudes aiai longitudes being, respectively, 1117^ W71°, 1J18° E61°, $20° E750, all being too far from meridian passage for the disturbance of ionospheric corditions. Fairly ' large calcium flocculi in the neighborhood of these spot groups, as well as small flooculi at 328° ;V22®, li27^ Sl3®, SOI© B33°, N230 V/lSO,. having areas respectively of 8300, 700, 2000, and. 600 milliontlis of the solar disc, were reported by Lfciaith-Eulbert Observatory.
Geomagnetic character figures covering the eclipse day and control periods preceding and following it are given in Table 69 of the preceding issue of this report, IRPI^F12, A short period of moderate disturbance on 6 July was associated with ahove-average green coronal intensity appearing at the east limb as late as 2 July, apparently indicating the active area in the neighborhood of the first of the small flooculi mentioned above, t'l'est limb green coror*al intensity, associated with the same active area, was abo\^e average from 11 July to 16 July.
Ionospheric measurements were made at intervals of fifteen minutes or less during the eclipse day, and a control period of several days before and after 9 July, at a number of stations in Canada and the United States. Host of these data are not yet available at IRPL, since considerable time is needed for scal¬ ing of the records. Figs. 52 through 55 are plots of the regular-layer charac¬ teristics for the eclipse day (heavy line) with the control days all superiir:- posed (light lines), for Boston, Mass., San Francisco, Calif., Baton Rouge, La. and San Juan, P.R. They were plotted in this manner to illustrate the vari¬ ability of the data, even on normal days and to show the relationship of the values during the eclipse to the normal scatter. As iisay be seen, the normal variability of the ionosphere was great enough to obscure any significant
eclipse effect®
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9
San Juanj, iHierto Rico, lay just outside the eclipse region® Ifo anomalies inconsistent with the usual day-to-day variations were noted© The eclipse ended at about sunrise at San Francisco, Calii"© Similarly, no variations in ionospheric behavior in excess of day-to-day variability were observed in this case© At Baton Rouge, Louisiana, there were likewise no anoE».lie8 asoribable to the eclipse, although this station lay in the region of partial eclipse, where the magnitude of eclipse was 0.52 at 1148 GOT (0548, beginning at about sunrise and ending at 1239 GOT (0639, 90%). Absence of any notable eclipse effect here is not surprising since the lower ionospheric layers, in which it would be most apparent, were barely forming at the time of eclipse. At Boston, I^iassachusetts, the mag¬ nitude of the eclipse was 0.58 at 1206 GOT (0706, 75%), beginning at 1109 GOT (0609 , 75%^) find ending at 1309 (0809, 75%). Some indication is given of lowered frequencies in all -three ionospheric layers during the latter part of the eclipse period, but the fl*agm@n-fcary nature of the data -does not admit of significant exact analysis when used alone©
Interoomparis on of da-fca from all observing stations is necessary in the determina-tion of eclipse effects. The da-ta presented here, -while in them¬ selves showing no striking anomalies in behavior, are necessary in delineating the aarginal effects of the eclipse, and, together with data from other places, in obtaining -the quanti-tative time and geographical gradients in ionization resulting from solar obsei*vation.
Although final da-ta are not yet available from other stations, prelim¬ inary analysis has shown that at Washington, D.C., flayer critical frequen^ cies rose more slwirly than usual during the morning of the eolipsej F2-layer reflections were blanketed by Es.
Preliminary reports from the five Canadian stations making observations show marked eclipse effects. Estimates of the extent of ionization density decrease aret
E FI F2 F
1 T T Victoria Beach, Man. • • . . 55 32 -
Churchill, Mon. . 37 34 -
Prince Rupert, B*C. • • • • - - >34
Ottawa, Ont. . 28 27 -
3t. Johns, Newfoundland © • 25 27
At Prince Rupert, B.C., the E layer was blanketed by Bs, and the eclipse occurred before the separation of the FI and F2 layers. Maximum eclipse ef¬ fects were ob-tained at Victoria Beach, Man. Ko lag in S- or Fl-layer density change was observed wi-tti respect to the maximum phase of the eclipse at any s-tation, but a lag of 20 minutes was observed for the P2 layer at Victoria Beach*
Comparatively little radio fieId-intensity data are yet available for this period* Rseliminary reports indicate, for the time of eclipse, unusually good reception on transmission paths be-fcween Washington, D.C® ani most Nor-th
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10
/Atlantic stations, arid betvsreen San Francisco and London, poor reception betw'een V/ashington, D*C. and Stockholm, Sweden, and norml reception between New York City and Fairbanks, Alaska, and between Boston, Ivlassachusetts, and Mexico City, Mexico, Vi/ashington, D,C«, and Chicago, Illinois*
ERRATA
1* The graphical presentation of data from Prince Pupert, Canada, for June 1945, Figs. 7 and 8, in the ^gust issue of this report, was incomplete. Table 32 in the same issue presented complete datag, Th© Figure belcw will complete the graphs.
2« Information was received that Si.uonstown data up to 1 August 1945 were received on 30^E meridian time. Beginning 1 August, all data from Simonstown will be ,reported on 15®E®
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Table 63
Ionospheric Storminess, August 1945
pr i nc i'pa 1 41 orias/ Day
August 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 15 17 13 19 20 21 22 23 24 25 26 27 20 29 30 31
Ionospheric Character* 00-12* OCT 12-24 GCT
2 3 2 2 1 2 2 0 1 1 1 1 2 2 2 1 1 1 1 1 1 2 2 3 2 2 2 3 3 3 2
3 3 1 2 1 2 1 1 1 1 0 1 3 3 1 1 1 0 0 1 1 1 3 3 2 3 2 3 3 2 2
Beginning GCT
End
GCT
Geomagnetic Character** 00-12 GCT 12-24 GCT
1 3 2 2 2 2 1 1 1 1 1 2 2 3 2 2 1 1 1 1 2 1 3 1 1 1 1 4 2 0 1
2 2 2 1 2 1 1 2 1 1 2 1 2 2 2 1 1 1 1 1 2 3 1 0 0 1 2 2 1 1 1
--;;7onosphe're'~rhgrac'ter figure ('iTt-lgure) for ionospheric WashiiKton, 5.C., durlns 12-hour psriod.on an arbitrary scale of
0 to 9, 9 representing the greatest disturbance. « .. Averaso for 12 hours of American mgnetao K-fipre, ® J
Lmber of observatories, on an arbitrary scale of 0 to 9, 9 rep-
/ * ::rrTonrrph£r:"^-'-rf ra:;ved at Washington during ^gust, 1946.
-
Table 64
Sudden
Day GCT
Beginning Snd Locations of transmitters
Relative intensity
at minii.ium*
Other phenomena
August
17 2020 2145 Ohio, DaCo, 0.0 Terr,mag. England, Mexico, Brazil, Chile
pulse^^ 2019-2120
★Ratio of received field intensity during SIjD to average field intensity before, and after, for station rSXAL, 6080 kilocycles, 600 kilometers distant.
★★As observed on cheltdniiam magnetogram of the United States Coast ajxl Geodetic Survey.
at YJashington, DeC.
-
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ati
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FiK
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s Ju
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1S45
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s
a, 4^ o q> tD*-* OOOjdjtfOOK
II II II, n II H H H
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I o o
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00 02 04 06 08 10 12 14 16 16 20 22 00
35
30
O 2.5 O O
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CvJ u_
1 5
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10.0
9.0
0
- OBSERVED -PREDICTION MADE FOUR MONTHS BEFOR t ■
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o 70
2 6.0
50
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\ LOCAL TIME 00 02 04 06 00 10 12 14 16 18 20 22 0
Fig. 1. WASHINGTON, D.C.
39.p°N, 77. 5°W AU.GUST,I94!
-LIMITING FREOUEMGY T Me
-LIMITING FRFOUENO - 5 Me
-LIMITING FREQUENCY ^ 7 Me
Fig.2. WASHINGTON, D.C. AUGUST, 1945.
-LIMITING FREQUENCY = 3 Me
-LIMITING FREQUENCY= 5 Me
-LIMITING FREQUENCY = 7 Me
Fig.4. FAIRBANKS, ALASKA. JULY, 1945.
-
00 02 04 06 08 10 12 14 16 18 20 22 00
O O
2 zo
Cvj U.
J.5
!.0 12.0 M.O
10.0
9.0
8.0
O 70 2
z
p 50
^ 4.5
U 4.0
I
. — - -
OBSERVED
PREDICTION MADE FOUR MONTHS BEFORE -1 n P“
5 z
(/)
Es f2 Es
FI
h 7*
\ \ f
S 10 (T
^ 15
<
— 20 h-
OH o
1.5
10
r/
N \
/'
/ \
>
/ f
V \ N
1
TT 1
\ V \ \
1 LOCAL TIME 00
Fig 5.
02 04 06 03 10 12 14 16 18 20 22 00
CHURCHILL, CANADA
58.8°N, 94.2‘’W JULY, 1945
-
00 02 04 06 06 10 12 14 16 16 20 22 00
3.5
3.0
O 25 O O
s
IS -
1.0 I2i3 11.0
10.0 MADE atLt-unt.
U * u
^ 70 cr (f)
2 6,0 > 1
S' 5.0
> **
g 40 \
z> r ' t \
CR
ITIC
AL
FR
EC
5
b
e
S
V V
j
(
/ /
/
/
\
1
i \ 1.0 1 LOCAL TIME \
00 02 04 06 08 10 12 14 16 16 20 22 00
Fig.9. VICTORIA BEACH,CANADA. 50.8° N, 96.5 °w JULY, 1945.
-
00 02 04 06 08 to 12 4 16 18 20 22 OF s 1 1
— 4nn F2
>
^ 200
<
1-
q:
> 0
100 LOCAL TIME n
90
Ulo 5Z
fiO
^C9 ■> U-Z op 50
/
4 i HA I }— V UJUJ J \ 'v
'V s ir ujQ:: J. / \ Q.O \ / \ ' / N
/ , / / r -J \ 10
> r^. \ , 1 ‘\
IrJ :r
>
4 ± J \ 00 02 04 06 oe 10 1 l 14 16 18 20 22 OC
LIMITING FREQUENCY 3 Me
LIMITING FREQUENCY- 5 Me — LIMITING FREQUENCY 7 Me
Fig. 15. BOSTON , MASSACHUSETTS JULY, 1945
-
00 02 04 06 ■ 08 10 12 14 16 10 20 22 0 0
2 400
h-
1 riT F2
-f- 7 Id UJ
^ 200
< ^ 100
a:
> o
/ fl FI
E
j 1 L
PE
RC
EN
TA
GE
OF
TO
TA
L
TIM
E
FO
R fE
j> L
IMIT
ING
FR
EQ
UE
NC
Y
—
(\)0
1
oo
o
o
o
ooo
ooc
1
1 LINE Vi LOCAL TiWE; '
T --
1 ; 1 1 !
1 ;
\ Y y /
/
1
/\ ■>j 1 \ \ \ \ j
> V ^ > \ / kN s. \ \ / \ \
/ / r \ \
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. 17, SAN FRANCISCO, CALIFORNIA JULY, 1945.
-LIMITING FREQUENCY = 3 Me
■-LIMITING FREQUENCY^ 5 Me
-LIMITING FREQUENCY = 7 Me
Fig. 19. BATON ROUGE , LOUISIANA JULY, 1945.
-
00 02 04 06 08 10 12 14 If, 18 ' 20 22 00
VIR
TU
AL
HE
IGH
T
IN
KM
—
ro
OJ
O
O
O
O
5 o
_Q_
Q_
O
F2
1
FI
100
90
■ 60 lUO Sz
70
60
Op 50
HA 12 w (UJUJ •Uh- 50 a:
'ujQ^ iCLp
^ 20
iO
LOCAL TIME
n \
r r' 1 !■ \ ( \ 1 / V 1 fj
A T • i u \ i V. L V A. l- z
jt i rs k 1 !| \ N|
\ L T s, A — V.
\ /Y ^ 00 02 04 06 08 10 12 14 16 18 20 22 00
--—LIMiTiMG FREQUENCY = 3 Me
-LIMiTlNG FREQUENCY-5 Me
-UMITjiVfG FREQUENCY • 7 Me
Fig. 21. SAN JUAN, PUERTO RICO JULY, 1945
00 02 04 06 08 10 12 14 16 18 20 2 2 00
3.0
O 2.5 O O
2 20
CvJ Li.
15
1.0
12.0 11.0
IC.O
9.0
00
^ 7.0
s:
S" 5.0
H «
^ 4.0
1 3.5 S iO ^ 25
<
^ -
1,5
IQ
- OBSERVED -PREDICTION MADE FOUR MONTHS BEFORE
F2 V.
tjL X ■■p
ST / —ZT >J ■V
ii''" k •UJ
t /
/ r' ' L A )
''V } f - c \ \ 6-5 N k
V j 1 r \ \:
\:
_
ii •/ ■( 1
T
i :\
s i LOCAL TIME 00 02 04 06 08 10 12 14 16 18 20 22 00
Fig 20 SAN JUAN, PUERTO RICO
I8.4°N, eC.I^W JULY, 1945
-
00 02 04 06 08 >0 12 >4 16 16 20 22 00
O 2.5 O O
5 20 1
OJ
^ 15
1.0 12.0 11.0
lO.O
9.0
- OBSERVED -PREDICTION-MADE FOUR MONTHS BEFOR
^ 70
■Z.
p 5.0
g 40
LU 1C
_ — --
CR
ITIC
AL
FR
EQ
U
b
6i
-
00 02 04 06 08 10 12 14 16 18 20 22 00
3,5
30
O 2.5 O O
^ 2 0
1 CvJ
^ 15
1.0 12.0 1 10
100
9.0
8.0
^ 7.0
^ 6.0
S" 5.0
“ 45
^ 40
OBSERVED PRFDir.TION MADE FOUR MONTHS BEFORE -'
9; Z>
CO
F?
_ _ \
\
's. F
S cr
^ 23 _i <
y eo
5 o
1,5
in
_E
/• “'s,
\
/' /
\ \
/' /
/
\ \ \
/ 1
1 1 n
.1 LOCAL TIME
00 02 04 06 08 10 12 14 16 18 20 22 00
Fig 31. SLOUGH, ENGLAND
5I5°N, 06°W JUNE,1945
-
I
I
Fig. 32. ST. JOHN’S, NEWFOUNDLAND
47.7°N, 52. 7°W JUNE, 1945.
-LIMITING FREQUENCY = 3 Me
-LIMITING FREQUENCY= 5 Me.
-LIMITING FREQUENCY = 7 Me
Fig 33. ST. JOHN’S, NEWFOUNDLAND JUNE,1945.
00 02 04 06 08 10 12 14 16 18 20 22 00
s
2 400
h- X 300 o UJ ^ 200 -1 <
1 uu
cc > n
PE
RC
EN
TA
GE
OF
TO
TA
L
TIM
E
FO
R fE
j> L
IMIT
ING
FR
EQ
UE
NC
Y
co
o
OO
O o
oo
oo
OO
C
LOCAL TIME
/
y \
\ ( 1 \ 1 1 1
1 1 \ \ 1
/ i \ / . } r-' \
/ / \ \
'nJ i f t \ / \
\ / / 1 JL 'v J L' L 1 z . % —- 1 ' .
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. 35. COLOMBO, CEYLON JUNE, 1945.
-
00 02 ■ 04 06 08 10 12 14 16 18 20 22 00
z
Z 400
X 300 o Ijj ^ 900
F2
r
k, -\
VIR
TU
AL
—
1 o
< 3
O
<
-E
100 LOCAL TIME
, > 80 UJO SZ
70
N,
\
|0
-
Fig. 43. COLOMBO, CEYLON
6.6°N, 80°E. MAY,1945.
-LIMITING FREQUENCY = 3 Me
-LIMITING FREQUENCY^ 5 Me
-LIMITING FREQUENCY = 7 Me
Fig.44. COLOMBO, CEYLON. MAY, 1945.
Note'
As this Issue went to press,
word was received thot observed
doto from Simonstown hove been
reported one hour too late. Data
for 00 should be for 2 300 etc.
See ERRATA section.
-
. ; yy'^. X - •'
j
1
I
-
IKPL HiPOkTS
Dailyt jfelephoned and telegraphed reports of ionospheric, solar, geomagnetic, and radio
propagation data from various placeso Radio disturbance warnings.
Semiweekly; IRPL^J. Radio Propagation Forecast.
Semimonthly; IRPL-Ja. Semimonthly Frequency Revision Factors for IRPL Basic Radio Propagation
Prediction Reports, (issued with IRPI^J series from 4 to 7 days in advance).
Monthly; Basic Radio Propagation Predictions = Three months in advance. (War Dept.
TB 11-499- g monthly supplements to TM 11-499; Navy Dept. DNC-13-1 ( ), monthly supplements to DNC-13-1).
IRPLr-F. Ionospheric Data.
Bimonthly; IRPI/-G. Correlation of D.F. Errors with Ionospheric Conditions.
Q,uarterly; *IRPIrA.
IRPL-B. ♦IRPL-H.
♦*IRP!>M.
Recomaended Frequency Bands for Ships and Aircraft ,in the Atlantic and Pacific. Recommended Frequency Bands for Submarines in the Pacific. Frequency Guide for Operating Personnel. Frequency Guide for Merchant Ships.
Special Reports, etc.; IRPL Radio Propagation Handbook, part 1. (T/ar Dept. TM 11-499; Navy Dept. DNC-13-1). IRPL-Cl through C61. Reports ajod papers of the International Radio Propagation
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 Characteristics and
Maximum Usable frequencies. R5. Criteria for Ionospheric Storminess. R6. Experimental studies of ionospheric propagation as applied to a
navigation system. R7. Further studies of ionospheric propagation as applied to a
navigation system. R8. The prediction of Usable Frequencies Over a Path of Short or Medium Length,
Including the Effect of Es. R9. An Automatic Instantaneous Indicator of Skip Distance and I^JF. RlO. A method for study of the ionosphere. Rll. A Nomographic Method for Both Prediction and Observation Correlation of
Ionosphere Characteristics. R12. Ionospheric variations. Rl3. Ionospheric and Radio Propagation Disturbances, October 1943 through
February 1945. Rl4e A -Graphical Method for Calculating Ground Reflection Coefficients. R15. Predicted Limits for F2-Layer Radio Transmission Throughout the Solar Cycle. Rl6. Predicted pS-Inyer Frequencies Throughout the Solar Cycle, for Summer,
Winter, and Equinox Season, Rl7. Japanese Ionospheric Da-ta - 1943. R18. Comparison of Geomagnetic Records and North Atlantid Radio Propagation
equality Figures - October 1943 Tlirough I,{ay 1945, R19. Nomographic Predictions of F2-layor Frequencies Throughout the Solar
Cycle, for June. R20. Nomographic Predictions of F2-In.yer Frequencies Throughout the Solar
Cycle, for September. IRPLtT. Reports on Tropospheric Propagation.
Tl. Radar Operation and heather, (s-uperseded by JANP 101). T2, Radar coverage and weather. (Superseded by JANP 102),
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