.N'o. 17, i963] (1481)

RESULTS OF THE FIELD INTENSITY MEASUREMENT HF RADIO

WAVES AT NIGHT ON BOARD THE "SOYA"

Kazuo TANOHATA * and Saburo ISHIKAWA**

Abstract

This paper describes the result of the Jield intensity measurement of HF waves which was carried out at night on the way from Tokyo to Cape Town on board the "SOYA".

Field intensities measured were lower than

those of the so-called "unabsorbed field inten­sity'' and the lower the frequency, the more rapidly the field intensity decreases with the

distance of transmission. Hence, it is suggested

that the non-deviative absorption must be taken

· into consideration. From the measurement on

2.5 Mc/s wave, it was derived that the non­

deviative absorption converted into the vertical

incidence was equal to 1.0 db. · On the other

hand, the weighted mean value for all frequen­

cies measured was 2.5 db. The difference be­

tween these values is examined herein.

� O)ffl'a'vt, m1t1*0):ernm:::tovt G m-W1i1t�rn1JJE L t-=m*v:: �v' --c Jltt""t-= t O)c, ;e=;1t �

iMt:v::l�t-=�*�,H�gt Lt-: t O)c, *JEe{]tJ:ir-s*n)�Gnt-:.

illJJEviJlf�tn�G Cape Town v::�Gfi.J'dJ::v:::tov'--CtJ:�tit-:tO)c, la*vi lOMc/s 1\tv:::to

", -c vi�.:]Pt:l:n)::l,'tJ: < , 5<.:e--ml1t�11tv::mJt1Je{JtJ:�{ivi1{:} G ntJ:n� 0 t-=:n), 2.5Mc/s 0) JJY

Q.)'.3tfg�*i'J�G>.Ko6t-:1i:1ot:l:vi, �1Hl�H5t%tv::.�� L--C 1.0db fJ:G{i[�1{:}t-:. �nvi, ;s=j:j�J3;:v::

J: 0 -C>,KY)Gtl,t-:{i[ 1.7db v::JtL-C 60% {ftO){i[-Czli)G7J;, · 1j{IJJE{i[n�v!G��, 3<.ft!mtmim

-c:t==f1llJJEfilv::�n) zli) GO) c�:1:e{JtJ:it c vtv,-f n � t* 0 t-: G v' v' n�vtlfflJEc � tJ:v ,.

_.1f 2.5Mc/s v::;tov,-cvi, ��JtJ!H:::tovt G�illLi#,n):Jt'tJ:v'O)c, illJJE Lt-=:ml1i�1\Ht$v::

-0v,-c�ti� 2.5Mc/s O)ifiliJlH5t%tv::��L--C, :fJo:m���>.Ko6-CJJ-Gt, 2.5db fJ:G{0!�1{:}

t-:. 1{:} G ti t-:fil� Wui;: 2.5Mc/s 0)1llJJEfilv:: � --c vi o6-C dl-G t, 1 @1Bz%t O)�fW�I1Jlt173-c tt�o6

* rlJ JI! 11 it ti iJlU ffr, m 6 i?Z m :ti.:1:-fu�tiiJlU��- Yamagawa Radio Wave Observatory (R.R.L.). Member of the Japanese Antarctic Research Expedition, 1961-1962.

** rl!J1!1!trltfiiJt1JrJr. Yamagawa Radio Wave Observatory (R.R.L.).

52

iJtlJ�@J� w B 1 @J mu��ru �x-1i ,r#lsi (J) r:r ,r#jJt

�ru

iJ!IJ%:!ict! ,1 - Y - § tJH:. J: 0 1I it

Bridge

ifi-U 5€ � 1±1fi} K -42 ffl ;Ms; f81[ J/!.

5�J.jjJ!IJ�� fgi/fi}

ARM-5211 � r:p

�1Jt1[W§�J:r1JtlJ5E

ti:to*::st�r v:.llJffl l i:1[Ji!.5�J:r (J) 100) i � -c 50 % (J) 1[{-C 2b 0 .

t.::..

� (J) �J, *1. t)JrP. 9=1 Mun tJ a� sJJ -C 2b 0 (J) -C, i -f, '.x' 1g 1[ W 5� [r Eobs(db) t, lKW � $ (J)

3xl05

20 log---cr- db v:. J: -:) -c 1§. ,;z. G n0 v'bKP 0 �iftJ�� 5ffi J:t Eo(db)

:=. � -c d v ;t � x-fg ,r#, Fsi (J) NE lfJl c &)Q,

Fig. 1 vi, tUmv:.1:2f11HelfJl a

2:' t �, *iiHrnv:. Eobs-Eo (!)1@:2:' t --:d.::. ?b (J) c 2b 0. �i!lli1�rJ&�Xi7�

db 20

10

db 10

0

-10

db 20

(1482) [J¥fi-Utf;fS/-

Table 1. Measuring means of field intensity on board the SOYA.

Stations

JJY

zuo

WWVH

2 3

2 3

Frequency I Generating I

power

2.5MC / 2 KW

5.0 11

10 .0 "

15.0 11

5.0 11

� .

10.0 11

10.0 11

15. 0 11

JJY 2.5Mc /s

4 5 6

JJY 5Mc/3

)( )( 'ft •

I

"

"

4 KW

0.3 11

2 " � �----

2 "

7 8X lO'Km

•

Location

35° 42'N

139 ° 3l'E

----------�·

25°58'8

28 °14'E

20° 46'N � -----�

156°28'W

• outward >: homeward

4 5 6 7 8 9 lOXlO'Km

JJY lOMc/s

-l0:::-0 �-;:--2 �3-4��5-G!c---, --:c-7-8':-----':--9-1'-0 ---'-11---'12'--1-"-3-x ---,-10' Km

db 20

db 20

10

ZUO 5Mc/s

2 3 4 5 6 7 8 ,<1 O' Km

WWVH lOMc/s

Fig. 1. Eo bs-Eo : d curve.

No. 17, 1963] (1483) 53

tce:v,t{i5Et"n�!, Eobs-Eo O){itJ]iffi1JiH:.JfL,--C_..5E1il G (:;ffJJJ�i:J=tlil:B:t.r lKW �:.Jtt"0 fU�) �ffet""1:&J0 3. Lil� L,tce:il�G Fig. 1 ��0v:., JJY 0) 5.0Mc/s ��v'--C, CO)ffi! �iffi1J!til�:ltt" t � G {rl{[j:ij � ffe L, --Cv' G.

C n�:trm G ;,j��:.��f<tr!J&J&��rl-tttlv!fJ: G �Ct £��-t G. -tn�.:t

Eobs=Eo+G-:-I'N (1)

I'N =I'N(V). D (2)

D d

(3) =Nexp--c.n

I' N : ��f<trtJbZJ& rN<V> : :!!IH[N'.!tc:..tovt G rN

n : '§�v:.J:-? --cl}.:tGnt-=��O)ffir,Jtir�'ri �1Bt5E l,--CfflLf:Jr��Y), G t rN(V) �ii1J,§*��:.J:-? --C;1to6t.:*6.:�Hi Table 2 O)t(Q < "1:&> G· tce:.to, $�0)f.:ot);t§M1*� r � t11Hc L, t.:. Stations

Table 2 � � G t , :a- Jal tlt � 1lH:. 0", --C

r N<V> 0)1f�:t � 3 t MHllJ�"1: �i tee: < , Y.. 2.5 Mc/s O)t,ll!J5Ev:..tov, --c �iJ!:ffi.O)t,lllJ5E1ilil�:J,' tce:\t,0)"1:, en� 2.5Mc/s v:.��t"Gt.:00 �:.tm:m+:l'§J1il�31to6t.: (5.0Mc/s �if§Milt� v' 0) "1: C n � �7'� L, t.:).

JJY 2.5Mc/s

II 5.0

II 10.0

zuo 5.0

WWVH 10.0

jJl]ll + :1-§J fil[ � 31t o6 G 1:r it� i m ( 4) ;ct 0) :tlll < "1: &J G •

II

II

II

II

Table 2.

G(db) I'N<V,(db)

1.2 1.00

-3.5 0.06

13.7 0.46

8.2 0.62

26.4 0.44

r N<V>2.5= ! { 1 .00+8x0 .62+10 .2(0 ·46!0 .44) }--- c 4 )

r

0.71

0.11

0.76

0.54

0.85

cc�:. 5Mc/s 0) I' N(V) 0 .62 0)1*� 3 lk.rf lOMc/s O)I' N(V) O)+:l'§Jfjl[O)f*� 10 .2 �i, i­n.:f n��il� (f + !L)2 v:.Jl/!J:t-fJU-t G ct ii� G3Jt00t.: t 0)-"(: &JG.

ii� < L, --c r N<V> 2.5 O):f.m:m+:h§J1il�i 2.5 db � m, G.

Fig. 1 ��*ffiv:.�G t, 2.5Mc/s lk.rf 5.0Mc/s �:..t,1..,,--c, l@Bz%'JO)�JWffi.liJtt}!!!,bn0 4000km ftlli:v:.�aiI,#,il�ttiEt" G ct il�bil�G. Y.. 2.5 Mc/s 0) 1 @JBt!rt�.&Wffi.r9lk.rf, lOMc/s v:..t,1..,,--c�iftJmt{glJm0)%iJl�;,j�ffli�'1:&JG Ct il�bil�G.

cnvi1l1J%:::ffil��b 0 --c1..,, G ct v:. J: Gt 0) t ,'1!!,bnG.

54

Fig. 2 (a)

Fig. 2 (b)

Fig. 2 (c)

Fig. 2 (d)

db 60

50

40

30

20

10

9 X ...... .)(

83 z {III - � • E Jr I - .&�

JJY 2.5 !IWs • outward (Nov. 1961) xhomewar:d (Mar., ,1pr. 19GZ)

(Xl

. .......... ()(')

9X ra,..,! •. _ .. (•). <•J ro>

1 el .. ........

,., ,.,

The curve calculated by ·- the value m Table 2.

00'-- --'----'-2--....J3-

--4-'----.--'--__..JG __ ....1... __ --'-8---'----'10 X 1 O' Km

db 60

50

40

30

20

10

0 0

db 60

............. !

---

........ . --

2

;, .....

(l()

50 )( ;, ... ,, .. (Xl

40

30

20

10

00 2

db • ',O ', ..

• •

'""- 0

• )t -.:' .....

.. so '><, )( -- "

- ..

A3 (r, w) (sec)

'ix)·--

JJY 5MC/s 0 out ward (Nov. 1961) x homeward (Mar., Apr. 1%2)

(0) (0)

----,i)r·---•-" The curve culculateJ

by the value in Table 2,

8 ]OX 103 Km

J J Y lOMC/s o outward (Nov.1961) x homeward (Mar., Apr. 1 962)

-- --:;-.... J(

.-- --�-)("--�--·­-!<'--------

The curve calculated by the value in Table 2,

6 8 9 10x1o'Kmll

Z U O 5MC/s • outward (Nov., Dec. 1961) x homeward (Mar. 1962)

12

........

� >( • )(.

40

30

20

10

The curve calculated by the value in T able 2.

0os---+--+2 ---!3c--- --4'-- --..s----'6--�7'=---e-s-x 1 o' Km

No. 17, 1963] (1485)

d.b 60

so

40

30

20

10

WWVH lOMo/s • outward (Nov., Dec. i961) x homeward (Mar. 1961)

·- ')(

'•-><. • .)( ""-i..�J(. )(" )( -.. ..,,.x

.... �� ....... � .... x The curve- calculated

by the value in Table 2.

OO 1 2-· 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1920X10'Km

Fig. 2 (e)

-ftl,lg),*., v'i 2.5 Mc/s v:.01..,,-ctt_�t

��v:.5Ht-c 4200km tJTv:.01..,,-c(J)d},.�

u G ».U rN(V) �31tcx'>-CdJ..."Qt,

Table 3.

Outward Homeward Mean

G 10. 9 11.1 11.0

I'NcV) 2.25 2. 70 2.5

r 0.97 0. 77

E

db 50

40

30

\,',, ', X ' X

',:, calculated value by ',•,

,,:,

CE. +11.0-2.50D) db ',•

X ',

',:, ZOor-t---1,-2 --,,3-�'--±s-x-1o'=K-m

Fig. 2 (f). Field intensity of JJY 2.5Mc/s versus the distance.

- - - calculated value · outward x homeward

55

�1l0. ::.nvt, Wiv:.31tcx'>t� rN<V) 2.5 t��-t."Q. ltJ�l, 2@&:!lttJJ:v:.Jtl-c, �t::.O)

1i1H:t;iffl�nf, �FJ:l,7J��Q::. t v:.tt.0.

tJJ:4-@J(J)11!.W5$/.tnlU5Ev:.tov'-c1l G nt�*s*O)fJ�f�vt, �F13,v:.to1..,,-c t �1i�9&�vi1'f'.iE

°'t."QiJ�, 2.5Mc/s 0) 2 @JBz!lttJJ:'JJ.t.F JJY 0) 5.0Mc/s v:.to1..,,-cv1IDI��vift.<, 3Z. ZUO

0)1J{IJ5E1irHi l@JB(!jtO)�l.WffiliJt��viLt'G0�7J�� < EJl��:.ftbnf, 1�tlJJfPJ�BzMtfJHl{$

k:.01..,,-c�i1:-t ."Q !Z'�?J�cb !J, �*BHt4-1&v:.fflt�bv!tt. G ft.v'.

1) g II__:. : r:r;R:1UJtti.illumr.*:9Effl1!r, m 3 �. e:gfo 271f. 7 J'j. 2) Eit" if: : J.R.R.L., May 1961.

(1962 1f. 9 J'j 17 B 5tl.!)