FOR NOVEMBER 1986 VOL. 38 NO. 11 CONTENTS
RADIO RESEARCH LABORATORY MINISTRY OF POSTS AND TELECOMMUNICATIONS TOKYO, JAPAN
sion (S) and radio propagation (P) obtained at the following stations under the Radio Research Laboratory, Ministry of

A. IONOSPHERE
Ionospheric observations are carried out at five stations in Japan by means of vertical sounding method. The published data consist of tabulations of hourly values of the ionospheric characteristics and figures of daily f-plot. All symbols and terminology in the tables or figures of ionospheric data are used in accordance with the "URSI Hand¬ book of Ionogram Interpretation and Reduction (Second Edi¬ tion) 1972" and its revision of chapters 1-4, published in July 1978.
(i) Descriptive Letters The following letters are entered after, or used to re- place a numerical value on the monthly tabulation sheets. A Measurement influenced by, or impossible because of, the presence of a lower thin layer, for example Es. B Measurement influenced by, or impossible because of, absorption in the vicinity of fmin. C Measurement influenced by, or impossible because of, any non-ionospheric reason. D Measurement influenced by, or impossible because of, the upper limit of the normal frequency range in use. E Measurement influenced by, or impossible because of, the lower limit of the normal frequency range in use. F Measurement influenced by, or impossible because of, the presence of spread echoes. G Measurement influenced or impossible because the ionization density of the layer is too small to enable it to be made accurately. H Measurement influenced by, or impossible because of, the presence of a stratification. K Presence of particle E layer. L Measurement influenced or impossible because the trace has no sufficiently definite cusp between layers. M Interpretation of measurement questionable because the ordinary and extraordinary components are not distinguishable. N Conditions are such that the measurement cannot be interpreted. o P O R S T v W X Y Z J T U Z Measurement refers to the ordinary component. Man-made perturbations of the observed parameter; or spur type spread F present. Range spread present. Measurement influenced by, or impossible because of, attenuation in the vicinity of a critical frequency. Measurement influenced by, or impossible because of, interference or atmospheries. Value determined by a sequence of observations, the actual observation being inconsistent or doubtful. Forked trace which may influence the measurement. Measurement influenced or impossible because the echo lies outside the height range recorded. Measurement refers to the extraordinary component. Lacuna phenomena, severe layer tilt. Third magneto-electronic component present.
(ii) Qualifying Letters
The following letters are entered in the first column before a numerical value on the monthly tabulation sheets. A Less than. Used only when fbEs is deduced from foEs because total blanketing of higher layer is present. D Greater than. E Less than. I Missing value has been replaced by an interpolated value. Ordinary component characteristic deduced from the extraordinary component. M Mode interpretation uncertain. 0 Extraordinary component characteristic deduced from the ordinary component. (Used for x-character- istics only.) Value determined by a sequence of observations, the actual observation being inconsistent or doubtful. Uncertain or doubtful numerical value. Measurement deduced from the third magneto- electronic component.
(iii) Description of Types of Es
When more than one type of Es trace are present on the ionogram, the type for the trace used to determine foEs must be written first. The number of multiple traces is indicated after the type letter. The types are: f An Es trace which shows no appreciable increase of height with frequency. l A flat Es trace at or below normal E layer minimum virtual height or below the particle E layer minimum virtual height. c An Es trace showing a relatively symmetrical cusp at or below foE. (Usually a daytime type.) h An Es trace showing a discontinuity in height with the normal E layer trace at or above foE. The cusp is not symmetrical, the low frequency end of the Es trace lying clearly above the high frequency end of the normal E trace. (Usually a daytime type.) q An Es trace which is diffuse and non-blanketing over a wide frequency range. F An Es trace showing an increase in virtual height at the high frequency end similar to group retardation. a An Es trace having a well-defined flat or gradually rising lower edge with stratified and diffuse traces 2 s d n k present above it. A diffuse Es trace which rises steadily with frequen- cy and usually emerges from another type Es trace. A weak diffuse trace at heights below 95 km as- sociated with high absorption and large fmin. The designation 'n' is used to denote an Es trace which cannot be classified into one of the standard types. The designation 'k' is used to show the presence of particle E. When foEs > foE (particle E) the Es type precedes k.
c. Definitions of the CNT, MED, UQ and LQ
Median count (CNT) is the number of values from which a median has been computed. In addition to numerical values, the count may include certain descriptive letters. Median (MED) of a set of numbers is the middle value when the numbers are arranged in order of magnitude, or the average of the two middle values if there is an even number of values. Upper quartile (UQ) is the median value of the upper half of the values when they are ranked according to magnitude; the lower quartile (LQ) is the median value of the lower half.
B. SOLAR RADIO EMISSION
Solar radio observations are carried out on 100, 200 and 500 MHz at Hiraiso. Observation equipments are: a pair of crossed doublet antennas with a 6-meter and a 10-meter parabolic reflectors for 500 MHz and for 100 and 200 MHz, respectively, and three appropriate receivers. Each pair of crossed doublet antennas is used as a polarimeter. Observations are feasible almost from sunrise to sunset. Time is expressed in hours, minutes and tenths of minutes U.T. and the unit of flux density is 10~22 Wm~2 Hz~1 for both components of polarization. All symbols and terminology in the table of data are used in accordance with the "Descriptive Text of Solar-Geophysical Data, NOAA" and "Instruction Manual for Monthly Report of Solar Radio Emission, WDC-C2".
a. Daily Data at Hiraiso
The three-hourly and daily mean values are Flux density. given. The three-hourly and daily mean values are Variability. given at 200 MHz only. Variability is expressed in the following four grades. 0 quiet or no burst, a few bursts, 1 2 many bursts, very many bursts. The number of bursts exceeding the mean flux level is counted. Daily data with parentheses mean that observation time does not exceed one third of the period.
b. Outstanding Occurrences at Hiraiso
The phenomena are picked up on the following criteria: 1. distinct from the prevailing kind of activity, correlated with other known solar phenomena, remarkable change-over from one situation to another. 3.
Flux density is the increase of flux over the level at which daily flux is calculated, or the increase of flux over the underly¬ ing burst when the event is superposed on another burst of long duration. Polarization is expressed by the polarization degree and sense as follows: right- or left-handed polarization, R or L weak, moderate or strong polarization, W, M or S almost zero or unable to detect polarization 0 due to small increase of flux, polarization degree of less than 1 percent. 00 The following symbols may be attached after numerical values in table, if necessary. greater than, or later than, D less than, or earlier than, approximate, or uncertain.
C. RADIO PROPAGATION
a. H.F. Field Strength at Hiraiso Field strength observation of 15 MHz standard waves trans¬ mitted from WWV and WWVH stations which are located re¬ spectively at Fort Collins, Colorado and Kauai, Hawaii, is carried out at Hiraiso. In order to avoid interference among the same frequency waves, the upper sideband of WWV or WWVH with the audio tone 660 Hz is picked up by the use of a narrow band pass filter with 80 Hz bandwidth. Particulars of the transmitters and the receiver are summarized in the following table.
Type is denoted by numerical code and letter symbol in parallel as follows: The tabulated field strength in dB above one microvolt per meter is the peak average of the incident upper sideband field intensity in 45 seconds after the universal time indicated on the table. Abbreviated symbols are as follows: CNT number of observed values, MED median, UD value of the uppermost decile when they are ranked according to magnitude, LD value of the lowest decile when they ranked according to magnitude, U uncertain, E less than, C influenced by, or impossible because of, any ar¬ tificial accident, S influenced by, or impossible because of, inter¬ ferences or atmospherics.
b. Radio Propagation Quality Figures at Hiraiso
The tabulated six-hourly quality figures are calculated for standard waves WWV transmitted from Fort Collins and WWVH transmitted from Kauai. Quality figures expressing radio propagation conditions are ranged over five grades as follows: 1 very poor (very disturbed), 2 poor (disturbed), 3 rather poor (unstable), 4 normal, S good. Whole day quality figure ranged in grades of 10, 1+, 2-, 20, 2+, 3-, 3o, 3+, 4-, 4o, 4+, 5-, 5o stands for an average of six- hourly ones of the two circuits. Abbreviated symbols are as follows: artificial accident, C S propagational accident, U inaccurate. Radio propagation conditions which can be described with a code in the following N normal. U unstable, W disturbed are forecast 12 hours in advance and broadcast six times per hour from JJY station. Data on a geomagnetic storm correlated with a radio propaga- tion disturbance are tabulated from observation at Kakioka Magnetic Observatory, Japan Meteorological Agency. Time (U.T.) is expressed in unit of hour and minute (or tenth of hour), and range in nanotesla. When they are uncertain quantitatively, /'s are used to replace the numerical values. Continuation of a geomagnetic storm is denoted by - -.
c. Phase Variations in OMEGA Radio Waves at Inubo
Variations in phase and in phase deviation are monthly depicted for four OMEGA radio waves received at Inubo. Par¬ ticulars of transmitting stations concerned which relate to the measurement are given in the table below. In each of the four figures, variations in phase ($) and those in phase deviation (^$) are shown in the lower part and the upper one, respectively. Variations in phase ($) are expressed by relative values at intervals of 30 minutes within every day (U.T.) (48 dots). An increasing value in this case denotes a phase delay. On the other hand, variations in phase deviation (A$) are express¬ ed by values at intervals of 30 minutes within every day (U.T.) (48 dots), deviated from average values at the same time for the six quietest days within the month concerned. A negative value in this case denotes a phase advance. When a polar cap phase anomaly (PCPA) is detected on the Aldra-Inubo and/or the North Dakota-Inubo circuit[s], PCPA's detected only on the Aldra-Inubo circuit are listed, in principle, below the four figures. The list mentions the start, the end, and the maximum times of a PCPA in a form of day/hour & minute in U.T. and its maximum phase deviation as a negative value. The following letters may be attached to values, if necessary. D greater than, E less than, U
d. Sudden Ionospheric Disturbances
(i) Short Wave Fade-out (SWF) at Hiraiso The table of short wave fade-out (SWF) is prepared from the record of field intensities measured at Hiraiso. Drop-out intensities of the 10 MHz, the 20 MHz, and the 25 MHz waves are respectively distinguished by marks ', '', and '"' from these of the 15 MHz wave for WWV and WWVH. Values of start, duration, type, and importance are obtained from data of the circuit whose drop-out intensity in dB is underlined as xx. When these quantities are not given correctly, they are accompanied by the following symbols. D greater than, E less than, U uncertain or doubtful. Types of fade-out are as follows: S sudden drop-out and gradual recovery, SL slow drop-out taking 5 to 15 minutes and gradual recovery, G gradual and irregular in both drop-out and recovery. Importance of fade-out is scaled according to its amplitude into nine ascending grades as 1-, 1, 1+, 2-, 2, 2+, 3-, 3, 3+ Correspondence of solar optical flare, solar radio burst, and geomagnetic crochet to SWF is marked by X in accordance with interchange messages of IUWDS and observations at Hiraiso. In table (i) SWF, date indicates the day to which start-time of event belongs. (ii) Sudden Phase Anomaly (SPA) at Inubo Data of sudden phase anomaly (SPA) are prepared from the records of phase measurement of VLF radio waves received at Inubo. The transmitting stations are listed in the following table. Phase advance is shown in unit of degree at its maximum stage. No transmission or no reception during the period is indicated by —, and indistinguishable record is spaced out, and multi-peak event is marked by *. Out of more than two circuits on which the same SPA event is observed, the phase advance on the circuit on which the SPA is the most remarkable or distinct is underlined. As for the underlined, phase advance, start, end, and maximum times are obtained. In table (ii) SPA, date indicates the day to which start-time of event belongs. The following letters may be attached to the value, if neces­ sary. D greater than, E U less than, uncertain or doubtful.
IONOSPHERIC DATA
IONOSPHERIC DATA 6
88
16
18 IONOSPHERICODATA
IONOSPHERIC DATA
IONOSPHERIC CDATA
IONOSPHERIC  DATA
IONOSPHERIC DATA
IONOSPHERIC DATA
islup of add in B. Solar Radio Emission a. Daily Data at Hiraiso 200 MHz Hiraiso November 1986
1. No observations during the following periods. Notes: 22nd  0100 - 0240 2. (q) likely quiet. 3. (*) interference. B. Solar Radio Emission a. Daily Data at Hiraiso 500 MHz Hiraiso November 1986
Note: No observations during the following periods.
November 1986
Hiraiso 194 salwollol TICE ( 201 filles - trials ning Cこのと() r ( )の( ) 。 d 2 C 2 C. Radio Propagation a.  HF Field Strength at Hiraiso wvv 15 MHz O A Y 99x 93x - 4 - 5 econes and sessions - 5 -7 6 3 6 Sへ
しE 500 E 515
E 54 sへsへ
しと1 5 -4
 19 e es - es  es  es  es  es  es  es  es  es  es  es  es  es  es  es  es  es  es
  es  e 2 10なc c C c c c c c c c c s of = 2 s 1 ch to ch - 25 - 25 - 25 - 25 sら4 3 = 8 E S u 7 E S s - -5 -25 2 -3 -21 s E S s 7
e 1
e 1 RES - ESSATES - ESATES - ESATES - ESATES - ESATES - ESATES - ESATES
 - 4 - - 3 - 14 -22 – 3 – 6 = 3 2 5 8 2 E S =2 = 5 s s = 3 ω i -50 -120258 -25 -25 -26 4 – 2 3 -2 s re ES -13 -28 -28 -28 -28 -28 -28 -28 -28 -13 -13 -1 -28 -28 0 1 1 - 2 -2 -3 2 5 3 E 1 5 5 5 5 5 5 5 =2 SSM
EL ω・・
ω・・
 e S ES -24 -24 -24 -24 -22 -22 -22 -22 -22 -32 -22 -32 -32 -32 -32 7マ5 3 ES E 5 = 5 ωロ
 ω ES -24 -24 -24 -22 -24 -22 -24 -24 -24 -22 -22 -22 7 1 6 2 S 3 E S E S ss 2
w s 2 = 5 s 15 ES  E 2 5な8 E S E S s on – 1 5 s of ESP ESPEES -24 -24 -24 -24 -24 -24 -24 -24 -24 -24 -24 -22 -22 -22 8 S 3 c S -ミッとう"
 " s o = 5 us ES -22 - s – 3 1 3 = 3と1 = 9 E Sと2 e - 3 ESSALES - ES - ES - ES - ES - ES - ES - ES - ES - ES - ES - ES - ES - ES
 - 3 -1 2 E S ES E S E S s 13. - 3 ES 1 5 7 C E S R E S sこ
w = 5 412 3 b -5 -43 -54 -54 -54 -54 -54 -54 -52 -52 -52 -52 -52 -52 -52 S 1 ó ES
S E S E S s 1
u 1 ES -24 -24 -24 -24 -24 -24 -24 -24 -24 -24 -24 -24 -24 -9 -22 3 7 1 7 b 10といω -4
ω s 1
e 1ミュ= S ES - ESE ES 1n 3 6 19 ES =3 Es es 4
 1 ES -ES 1 0 3 10 10 617
Gとも
しいうS 4
 - 15 ES - ES w i S wi s of c c c c s s = 5 w iミュージュ-ミュージュ2 4 2 C ES E SミS
7 = 7 -10 =5 PLES EST EST ES  ES  ES  ES  ES  ES  ES  ES  ES  ES  ES  ES  ES  ES  ES  ES
-24 S o 5 c c s 1 ωり252 E S – 10 ES -25 -25 -25 -25 -25 -25 -25 -25 -13 -25 -25 -25 -25 c 1 3 ES Es es 1 E S E S E S –5 $ -$$ s 10 7 ES 5 ES ES  -15 8 13 3 2 1 D 4 =2 E S E S E S =1 = S s v -4 -25 -25 -25 -24 -22 -24 -24 -24 -25 -25 -25 -25 -25 9 -13 -10 E SミS ES E S s s E Sとい- ESONES - - 10 -1 -24 = 3 s 1 s 1 S 4
 H w s o so-4
  - s o ES - ES 1 1 1とでω！ s S - 10 - 10 4 ～ 4
山ES -10 -10 0   6 1 C EST ESTATES - EST EST EST - EST - EST - EST - EST - EST - EST - EST - EST EST EST EST ES - 10 -1 -fs 12 1 3 14 15 16 17 1 3 19 29 21 22 23 24 25 2ら27 2 3 29 30 CNT 28 28 ω - MED 2 3 UD - 16 L D 28 29 27 29 29 2 9 _ 29 29, 29 29  29  29  29  29  29  30  30 3C 30 30 30 30 orらそ
しs " s 2 ～
e 1 e ω**
!! ω ES -24 -24 -24 -25 -25 -22 -25 -24 -24 -24 -24 -24 -24 2 2 4 n E S E S E S S E E SOURCES SHESTERES LES - SHESH ES - ES - ES - ES - ES - ES - ES - ES - ES - ES - ES - ES
 - 3 - -4 -24 -24 -24 -24 -24 -24 -24 -24 -24 -24 -24 -24 -24 -17 -24 10 10 7 ES   ES   ES   ES   ES   ES   ES   -2S  s o -7 -21 November 1986 1 2 3 4 5 ò 7 3 3 10 11 Radio  Propagation ci a. HF Field Strength at Hiraiso wwvH 15 MHz ,XX  291 231 o 6 -1111-6  -5 -14 -18 -18 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -18  15  15  15  12  15 17 13 1 a 17  13  21  20  15  52  52  -11  -11  -13  C Cںcしc  C c 17      12        18 3 140 140 250 220 270 31-12  『お』 -『 0, 750125 161 14 16  14  21  22  30  26  31  41  50  -52  -52  -14  -58  -58  -58  -58  -58  -58  -58  -22  -59 5 16  27   23   23   22   23    9  -18   13  -18   13   -18   13  -18   -18   -18  -18  -18   -18   12   14   17   16ら20  18  19  29  16  16  -3  -3  -3  -3  -3  -3  -3  -3  -3  -3  -11  -3  -3  -11  -5 6 10 16 16 7 16  19  22  23  23  23  53  51  - 3 17  20  20  21  21  11  53  -12  -12  -12  -12  -12  -12  -12  -12  -12  -12  -12  -12  13  13  1 16 16 , 9 12  18   23   24   23   11   11   11   11   11   -11 10 14 19 19 19 121 122 19 19 3 19 -12 -11 19 19 -12 -12 -12 -12 -12 -12 -12 -12 11 19  15  19  15  14  19  15  14  19  15  11  -11  11  -11  11  -11  -11  -11  -11  -11  -11  12  17  27  18 1 2 8pp 15x 17 13 15  1s  22  23  21  24  52 13 = 7 = 2 2 = 1 4 = 1 3 14  15   16   14   16   14   51  -18   11 1 4 13 16 21 19 10 5% 5% 51 -11 -11 -11 -11 -11 -11 -11 -11 -11 -11 10 11 11 15 18 15 18 20 22 12 2 2 -11 -11 -11 -11 -11 -11 -11 -11 -11 -11 -11 -11 -11 13 18 13 13 15 20  21  12  19  21  19  21  19  2 17 17  22  17  17  17  17  17  17  17  18  11  11  11  11  -11  11 1 3し3 18  13  16  20  12  13  13  13  11  -12  11  -12  -12  -12  11  -12  -12  -12  -12  -11 19 1 6m 21m 21m 13 cヴァ1500 2300 210 2.0 o o 7  52 -15 -25 4nc912nc912 13 15 18 17 21   C 1 2 22 15  22  15  22  22  15  10  -[]  15  -[]  15  -[]  15  -[]  15  -[]  15  -[]  15  15  15  18  15 2 3 18  10  13  17  17  17  17  17  17  1 2 4 17  25  19  27  27  24  58  58  58  -10  -13  -13  -13  -12  -12  -12  -13  -13  -13  -13   15  17  16 2 5 16  17  -19   22   22   13    52   53  -1 25 17  230 190 210 180ニューヨタードター -ニューヨタードター i- 6re 317 27 3 - 3:3 18n3 19 - 20 16  14112000180000 - 11 2 S 17  14 - 17  11 - 3  - 3  - 3  - 3 - 3 - 3 - 3 - 3 - 3 - 3 - 3 - 3 - 3 - 3 - 3 - 3 - 3 - 14  18  14 29 19201613 13 1616 13001203 13001800 seeニューキュータ- 30 C N T MED 29年2月29日29日27日27日29日29日29日29日29日29日29日29日29 16  18 - 19  121  17  19 - 19 - 1 19  23  23  23  23  27  24  24  29  31  31  31  -11  31  -11  - , 4, 1,05,105 11 12  13  13  14  17  15 -5  -5 u 6 L D
odaub. Radio Propagation Quality Figures at Hiraiso
c. Phase Variations in OMEGA Radio Waves at Inubo Inubo November 1986 (dog.) ALDRA - 13.6 kHz 100 Δダ0 – 100
400 200 p 0 ( d e g . ) 100 N.DAKOTA - 13.6 kHz 0 Δダ- 100 -200 400 & 200 0
13 (dog.) HAIKU - 13.6.kHz 100 Δダ0 -100 -200 400 200な0 DAY φ Polar Cap Phase Anomaly (PCPA) on Aldra-Inubo Circuit NONE
15 30 DYY 29 Δ β (deg.)
Hiraiso
Notes CO: Colorado(WWV)  HA: Hawaii(WWVH)  1): Australia  2): London
(ii) Sudden Phase Anomaly (SPA) at Inubo IONOSPHERIC  DATA  IN JAPAN  FOR NOVEMBER  1986 Vol.38 No.11 -  (Not for Sale) F-455電離層月報（1986年11月）第38巻第11号（非売品） 1987年2月23日印刷1987年2月27日発行研究を免疫所郵  政治省  電  波   〒184東京都小金井市賃井北町４丁目２－１ ☎ (0423) (21) 1.2.1.1(代)科発行 Fr Queries about "lonospheric Data in Japan" should be forwarded to: The Radio Research Laboratory, Ministry of Posts and Telecommunications, 2-1 Nukui-Kitamachi 4-chome, Koganei-shi, Tokyo 184 JAPAN,