Supplement to report CRPL-1-2, 3-1 · report noc national bureau of standards nov» 1, 1948 ....

REPORT CRPL-1-2, 3-1, A ISSUED NOVEMBER 1,1948

U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS

CENTRAL RADIO PROPAGATION LABORATORY WASHINGTON, D. C.

SUPPLEMENT TO REPORT

CRPL-1-2, 3-1

Report Noc NATIONAL BUREAU OF STANDARDS Nov» 1, 1948 CRPL-1-2, 3-1, A CENTRAL RADIO PROPAGATION LABORATORY

WASHINGTON, D0Ge

SUPPLEMENT TO REPORT CRPL-1-2, 3-1

Contents s

la Tables I»VIe Azimuth and distance of the subsolar point for stations at various latitudes,.

20 Tables VII-XIIC Local time and azimuth of the subsolar point for stations at various latitudes0

30 Revisions of Figures 3,4,9,10,15,16,21 and 22, CRPL-1-2, 3-l»

Description and use of tables

The charts of Figures 1-108 of report CRPL-1-2, 3-1 give field intensity contours for transmitting stations at specified distances from the subsolar point, plotted for azimuths relative to that of the subsolar point. To use these charts, the distance of the subsolar point from the transmitting station must be known, as well as the azimuth of the transmission path between the transmitting station and the point at which it is desired to know the field intensity,,

-ft

Tables I through VI give the azimuth and distance of the subsolar point for each hour of the day (apparent solar time at the transmitting station) for stations located at each 10° of latitude on the earth8s surface, and solar declinations of +23°, 0°, and «230o

Tables VII-XII present a somewhat more useful form of the information in tables I-VIC In tables VII-XII the local time "t" and the azimuth e,af> of th® subsolar point are tabulated for particular distances of the subsolar point corresponding to those represented in the charts of report CRPL°1“2, 3~10

Tables VII-XII are in the nature of a guide for us© in rapidly plotting field intensity as a function of time of day for a given transmission path0 Given the latitude of the transmitting station and the azimuth of the path at that station, in degrees clockwise from north, the following procedure may be followed to determine the field intensity, relative to 1 kw radiated on an omnidirectional antenna0

*Tables I»VI are the same as those issued previously as a supplement to report CRPL-1-2, 3-le

- 2 -

10 For the desired solar declination, th@ latitude nearest that of the transmitter,,

20 Uising a fora similar to that in the example b@low9 writ® ins

Column X9 th® distant© to the subsolsg8 pointe Column 2 9 th© local times tp both forenoon and afternoon,. Column 3s th© azlmuthi of the subsolar point &5 both -forenoon and aft®raoon0

3° Column 49 enter the difference between the azimuth of the path and that of the subsolar point, without regard to aign0

4o Using the data of columns 1 ©nd 4» &ad for th® desired frequency, determine th© field intensity for each local time from the appropriate chart of Figs0 1-103 of report CRPL 1-2, 3-l0

50 To obtain field intensities at other local times, plot th© values found in step 4 as & function of local time, draw & smooth curve through the points, and rt&d field intensity for desired local times from th© eurv©0

Example0 Latitude of station &ssi®uih of path 40°s frequency ■ 10 Me0 Solar declination + 23® (northern hemisphere summer)| distance ■ 6000 ton^ gunspot minimum, Tfaa data for 40°N will be us@d, from T&bl© IJi0

1 2 3 2 5 6 Distance to Subsolar point

(Km)

Local Tim©

t

Aziasuth U@go)

a

Different® Field in Intensity

Azimuths* (uv/sa)

Chart Used

12500 01o7 25 15 90Q

—

Fig. 64

10000 04o7 59 19 3o0 Fig0 52

7500 06o7 78 38 1,3 Figo 40

5000 08o7 97 57 0*7 Figo 28

2500 10o9 134 94 00 8 Figc 16 (revised)

2500 1301 226 186 lo5 Figc 16 (revised)

5000 15o3 263 223 3o0 Fig0 28

7500 1703 282 242 13o0 Fig0 40

10000 1903 301 261 16S0 Fig0 52

12500 22 0 3 335 295 18o0 Figo 64

- 3 -

It should b© noted that, although the field intensity ©harts, Figures 1-108, of CRPL-1-2, 3-1 &r® nominally to fee regarded ms if the transmitting station ®@r@ located at th® center, becaus® of the reciprocity relationship, th© field intensity is th® same if th© locations of receiving and transmitting stations are interchanged,. Thus th® above proc@dur® also gives the field intensity if all assismths, distance®, tlaes, and th® latitude «r@ referred to th® receiving location,,

Revisions of Figures 3.4„9ol0«,i5oX6o2I and 22„

Th® attached field intensity charts, labeled Figur©@ 39499,XQ»]?§&16,21 and 22 (revised), rsplac® the charts of the same figure numbers la report CRPM-2, 3~lc

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Table I. Azimuth in degrees clockwise from north (upper number) and distance in kilometers (lower number) of the subsolar point from s station in the northern hemisphere. Solar declination 0°,

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Table ¥20 Aste&tk i& &©|?r@®s sleeker is© frois north (tspper sssaibas) and distance in Clwef msra'bsr) of the- sab sola? point frm. a station in the southern h©sisph©r©0 Sola? declination <=23 0

Table ¥11

Sola? declination » 0C

Distance from transmitting station to mibsolar point. 2500 km 5000 km 7500 km 10000 ka 12500 km 15000 km 17500 km

Latr t t t

10o3 153 13.7 207 09„3 136

06o0 90 18,. 0 270 06o0 90 01o7 27

06o0 90 02o7 44

-8-50°

7.45°

08o 5 121

.^5JU9 12o0 180 12.0 180 10o 5 147

nm

03o7 65 00o0 00

03o9 70 01„ 5 33 e

09o9 137 07o9 107 06o0 90 04ol 73 02ol 43 14.1 223 16.1 253 18.0 270 19.9 287 21.9 317 09o6 126 07O8 104 06o0 90 04o2 76 02o4 54

,2 256 18.0 270 19,8 284 21.6

10o8 130 .2 230

0?o6 96 16.4 264

+10 10o6 114 09ol 100 07o 5 94

14.9 260 16.5 266

Q4o 4 84 286

,0 90 04o 5 86 19^5. ...274

02o9 80 21.1 280

01o2 50 22.8 310 01o4 66 22.6 294 01o5 79

09o0 90 15.0 270

07o5 90 16.5 270

t » apparent solar tin© at the transmitting station

a s aaimuth of subsol&r point from th@ transmitting station,

Table VIII

Solar declination = 0°

Distance from transmitting station to subsolar pointc

Lat. 2500 km 5000 km 7500 km 10000 km 12500 las 15000 km t a t a t_ a, t_ a t_a _t a

17500 km t a

06o0 90 18.0 270 06n0 90

t a apparent solar time at th© transmitting statioa0

a * azimuth of subsol&r point from th© transmitting siati©n0

Table II

Solar declination ** + 23°

Lat,

Distance from transmitting station to subpolar point0 2500 km 5000 km 7500 km 10000 km 12500 k® 15000 km 17500 ki t a t_a_ t & _ _ t_a_t a__t_ & t a

06e2

+65

±s£

10o 5 1 52 069 2 84 01o7 24 13.5 208 17-8 276 22.3 336 09o6 129 06o3 83 02o8 39 14.4 231 17.7 277 21.2 321 09ol 117 06o4 82 03o 5 48 14.9243 17.8278 20.5312

+50

+45° 1108 12,2 196 10o9 134 13.1 226 10o 5 116

2ULJM.

08.9 109 06o 5 81 04o0 53 15.1 251 17.5 279_ 08s8 103 06e6 79 04<,3 56

17.4 281 19.7 304 08o7 97

263 06o7 78 .17.3 282

04o7 59

1-2aU0L

10 u 102 08o7 87 06o9 13^.8 258 15.3 273 17.1

92 06o 8 77 04o 9 6] 268 17.2 283 19.1 299

0204 35 21.6 325

75 05ol ,9 43

3 64 03o3 48

07.! 72 05o4 65 03„6 53 00o8 16 I6JL288__1! 07o2 71 05o6 66 03o8 57 01o6 32 16,8.389 18^4.294.20.2 103 . 22.4.328 07o4 69 05o7 66 04ol 60 02ol 42

6 291 18^3.294 19.9 67 04o2 i

19.8 2^ 02o4 21.6

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00o0 00 ,0

t » apparent solar time at the transmitting station,,

a SB asimuth of subsolar point from the transmitting station,

Table X

Solar declination » + 23°

Latr

=70°

-65°

Distance from transmitting station to subsolar pointc 2500 km 5000 km. 7500 km 10000 km 12500 km 15000 km 17500 km

05o8 85 18.2 275

106 3 24

JJLJLUJL 05o8 84 18.2 276

01o 5 152 m

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09o2 39

1L&JZL 05o7 83 18.3 277

02o4 129

21,6.231 0209 117

07o7 56

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05.4 79 18^6 281

09o6 35

05o3 78

L2LJ282, 0701 61 05o2 77

63 05ol 75

03.1 109

20._9__.251_ 03o2 103 0Qo2 164 20.8 2 57 2 3.8 196

03o3 97 01ol 134

mjLMi 0105 116

01c6 102 22^2i8.

O303 92 20.7 268 03o3 87

20.7,273,.

09o9 42

12s0 00 12.0 360

l^OJOO.... mi 2.94,

07.8 63 06ol 67 04.5 67

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^L22i_^o_221

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t * apparent solar time at the transmitting station,

a * azimuth of subsolar point from the transmitting station,

Table XI

Solar declination s ~ 23°

Distance from transmitting station to subsolar point.

Lain 2500 km t a

5000 km t a

7500 km t a

10000 km t a

15000 km t &

+70° 10o3 156

iim

12500 km t a

05o8 95 18.2 265 05o8 96 010 5 18^2

17500 km t a

+5£

09,2 14.8 21

12o0 180 12^0 180

08o0 127

lLfl.232

10o3 155 1347 205 O906 145 U, 4 215

07o3 121

07ol 119 16.9 241

18.7 258 05o2 103 18.8 257 20.

Q3o3

t « apparent solar time at the transmitting station.

a * azimuth of subsolar point from the transmitting station,,

Table XII

Solar declination ■ =■ 23°

Distance from transmitting station to subsolar point. 2500 km 5000 km

L&tr 7500 km

t a 06o 2 95 17.8265

10000 km t a

12500 km t &

15000 km t a

10o4 103 13.6 257

08o8 103 15.2 257

07oX 108 05o4 5-15 18.6 245

5 115

10o7 128 13.3 232

i.9 15.1 252

07o2 109 16.8 251

05o6 114 Jl

03o6 127 2cyL

n0i 146 12.9 214 121 12,

09o0 112 07o4 HI 05o7 114 15.Q 24.8... ,16.6 249 18.3 246

03o8 123 20.2 237

“04ol 120 19.9 240

09o4 123 14.6 237

115 Of £

Jdk2L

06o0 113 18.0 247

04o4 115 19.6 245

02o6 123 2Ul22L

17500 km t a

,0 180 L0 180

t ® apparent solar time at the transmitting station0

a * azimuth of subaolar point from the transmitting station,

CENTRAL RAOtO PROPAGATION LABORATORY NATIONAL BUREAU OF STANDARDS

WASHINGTON, DC

Flfl. 3 (REVISED)

FIELD INTENSITY, pv/m, I KW, 7 Me SUBSOLAR DISTANCE, 0 km (0°)

SUNSPOT MINIMUM

* SUBSOLAR POINT

Q POINT OF MINIMUM FIELD INTENSITY

Field Intensity At Antipodes

270*

CENTRAL RA0I0 PROPAGATION LABORATORY NATIONAL BUREAU OF STANDARDS

WASHINGTON, DC

FIG. 4 (REVISED) FIELD INTENSITY, MV/m, I KW, 10 Me

SUBSOLAR DISTANCE, 0 km (0°)

SUNSPOT MINIMUM

* SUBSOLAR POINT

0 POINT OF MINIMUM FIELD INTENSITY


270

CENTRAL RADIO PROPAGATION LABORATORY NATIONAL BUREAU OF STANDARDS

WASHINGTON, D C.


* SUBSOLAR POINT


Fifl. 9 (REVISED)

HELD INTENSITY, |JV/m, I KW, 7 Me

SUBSOLAR DISTANCE, Okm (0°)

SUNSPOT MAXIMUM

/\

central radio propagation laboratory NATIONAL BUREAU OF STANDARDS

WASHINGTON, OC

Fig. 10 (REVISED)

FIELD INTENSITY, pV/m, I KW, 10 Me

SUBSOLAR DISTANCE, 0 km (0°)

SUNSPOT MAXIMUM

* SUBSOLAR POINT

© POINT OF MINIMUM FIELD INTENSITY


'iq°

CENTRAL RADIO PROPAGATION LABORATORY NATIONAL BUREAU OF STANDARDS

WASHINGTON, O.C

Fig. !5 (REVISED)

FIELD INTENSITY, |JV/m, I KW, 7 Me

SUBSOLAR DISTANCE, 2500 km (22® 30') SUNSPOT MINIMUM

* SUBSOLAR POINT



I


WASHINGTON, DC.

Fig. 16 (REVISED)

FIELD INTENSITY, pv/m, I KW, 10 Me

SUBSOLAR DISTANCE, 2500 km (22°30')

SUNSPOT MINIMUM

* SUBSOLAR POINT



1/Q

°

270

CENTRAL RAOIO PROPAGATION LABORATORY NATIONAL BUREAU OF STANDARDS

WASHINGTON. DC

Fig. 2! (REVISED)

FIELD INTENSITY, JJV/m, I KW, 7 Me


SUNSPOT MAXIMUM

* SUBSOLAR POINT




WASHINGTON, DC.

Fig. 22 (REVISED)



SUNSPOT MAXIMUM

* SUBSOLAR POINT




WASHINGTON, 0 C.

Fig. 22 (REVISED)


SUBSOLAR DISTANCE, 2500 km (22°30*)

SUNSPOT MAXIMUM

*

0

SUBSOLAR

POINT OF

POINT

MINIMUM FIELD INTENSITY


i/o

°

Supplement to report CRPL-1-2, 3-1 · report noc national bureau of standards nov» 1, 1948 ....

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Transcript of Supplement to report CRPL-1-2, 3-1 · report noc national bureau of standards nov» 1, 1948 ....