Post on 19-May-2020
.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.!)