FOR DECEMBER 1994 VOL. 46 NO. 12
COMMUNICATIONS RESEARCH LABORATORY MINISTRY OF POSTS AND TELECOMMUNICATIONS TOKYO, JAPAN
This Series contains  data on ionosphere ( I ) , solar radio emission (S) and radio propagation (P) obtained at the follow-
ing stations under the Communications Research Laboratory, Ministry of Posts and Telecommunications of Japan.

A. IONOSPHERE
lonospheic observations are carried out  at  the above  four stations  in Japan by means of vertical  sounding  using  iono- sondes. The ionosonde produces ionograms, which are record- ed digitally on computer storage medium as well as graphical- ly on 35 mm photographic film. The digitally-recorded iono- grams are collected from each station by the central computer and reduced to numerical values and Summary Plots  by the automatic processing system. The  ionograms obtained at Kokubunji are  manually  scaled  as well  by experienced specialists to supplement automatically-scaled parameters.
A1.  Automatic Scaling
Digital  ionograms are automatically scaled by  the pattern recognition method.  The following five  factors of  ionospheric characteristics are  published  for the present.  The  reliability of these factors has been ascertained by comparison of the automatically-scaled parameters with the manually-scaled values of large amounts of test ionograms. The  published data  consist of tabulations of hourly  values three factors ( foF2, fEs, fmin ) and  monthly  medians of of two factors ( h´Es, h´F ) , daily Summary Plots and monthly medians plot  of  foF2. a.  Characteristics of lonosphere
b.  Descriptive Letters The following descriptive letters are used in the tables. Impossible measurement because of the presence A of  a lower thin layer,for example Es ( for foF2 ). B Impossible measurement because  of absorption in the vicinity of fmin. C Impossible  measurement because of  any failure in observation. Impossible automatic scaling because of  too small G ionization density of the layer ( for fEs ). N Impossible automatic scaling  because  of  complex echoes. Blank  No digital record because of trouble in the auto- matic data  processing  system,  but existence  of  film record.
c.  Definitions of the CNT,MED,UQ and LQ
Median count (CNT) is the number of numerical values from which the median has been computed. In addition to numerical values, the count may include a descriptivel etter G. Median ( MED ) is defined as the middle value when the numerical values  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. If CNT is  less than 10, there are blank spaces left. d. Reliability of Automatic Scaling The results of the comparison between automatically- scaled  values  and  manually-scaled  ones showed  that hourly values  of  foF2 , fEs  and  fmin  were scaled within a difference of 1 MHz from about 90 , 90 and 99% , respectively of the test ionograms.
e.  Summary Plot
Daily  Summary  Plots which are made  from  quarter-hourly digital  ionograms are published  to present general ionosphere conditions. The upper and middle parts of a Summary Plot show  the diurnal  variation of  the frequency  range of  the echoes reflected from the Fand E regions, respectively. The two solid arcing lines indicate the predicted values of fxE and foE calculated by the method described in the CCIR report 340.  The lower part shows the diurnal  variation of the virtual height where the echo traces become horizontal.
A2.  Manual Scaling
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  lonogram  Interpretation and Reduction ( Second Edi- tion ) 1972 " and  its revision of  chapters  l-4,  published in July 1978. a.  Characteristics of Ionosphere
b. Symbols ( i ) Descriptive Letters The following I etters are  entered after, orused to replaced  a numerical value  on  the  monthly  tabulation sheets, if necessary. Measurement influenced by, or impossible because A 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. u 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 echoss. Measurement influenced or impossible because the G ionization  density  of  the layer  is  too  small to  enable it to be made accurately. Measurement influenced by, or impossible because H of, the presence of a stratification. K Presence of particle E layer. Measurement influenced or impossible because the L trace  has no sufficiently definite cusp between layers. Interpretation of  measurement  questionable because M the ordinary  and  extraordinary components  are  not distinguishable. 2 Conditions are such that  the measurement  cannot be interpreted. o Measurement  refers to  the  ordinary  component. Man-made perturbations of  the observed parameter; P. or spur type spread F present. a Range spread present. Measurement influenced by, or impossible because R of, attenuation in the vicinity of a critical frequency. S Measurement influenced by, or impossible because of, interference or atmospherics. T Value determined by  a sequence  of observations, the actual observation being inconsistent or doubtful. >> Forked trace which may  influence the measurement. W Measurement influenced or impossible because the echo lies outside the height range recorded. x Measurement  refers to  the  extraordinary component. Y Lacuna phenomena, severe layer tilt. Z 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, if necessary. Less than. Used only when fbEs is deduced from A foEs because total blanketing of higher layer is present. D Greater than. E Less than. l Missing value has been replaced by an interpolated value. J Ordinary component characteristic deduced  from the extraordinary  component.
B. SOLAR
Solar radio observations at 200, 500 and 2800 MHz are carried  out  at Hiraiso. The observation equipment consists of two parabolic antennas, one with 10-meter diameter for 200 MHz  measurements  and  one  with 2-meter diameter for  500 and 2800 MHz  measurements, Observations are continuously carried out almost  from sunrise to sunset.
B1.  Daily Data at Hiraiso
The three-hourly  mean and daily mean values of  the solar radio emission intensities are tabulated separately for 200 and 500 MHz measurements. The intensities are expressed by the flux density in 10'22 Wm ² Hz ¹ unit. The table for 200 MHz measurements also presents the variability  indices  defined by  the  number of  impulsive  radio bursts within the  three-hour intervals as follows: 0 quiet or no burst, 1 a   few bursts, M Mode interpretation uncertain. O Extraordinary  component  characteristic  deduced from the  ordinary component. ( Used for x-character- istics only. ) T Value determined  by a sequence of  observations, the actual  observation being inconsistent  or doubtful. Uncertain or  doubtful numerical value. U Measurement deduced from the third magneto- Z 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 trace is indicated after the type letter. The types are: l An  Es  trace which shows no appreciable increase of height  with frequency. - A flat Es trace at or below the normal E layer minimum virtual height or below the particle E layer minimum virtual height. An  Es trace showing  a relatively symmetrical cusp at C 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 normnal  E  trace. ( Usually a daytime type. ) An Es trace which is diffuse and  non-blanketing g over a wide frequency range. r An  Es  trace showing  an  increase in virtual height at the high frequency end similar to group retardation. An Es trace having a well-defined flat or gradually a rising lower edge with stratified and diffuse traces present above it. A diffuse Es trace which rises steadily with fre- S quency and usually emerges from another type · Es trace. A weak diffuse trace at heights below 95 km as- d sociated with high absorption and large fmin. n 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 k particle E. When foEs > foE (particle E) the Es type precedes k. c. Definitions of the CNT, MED, UQ and LQ Median count ( CND)  is  the  number of values from which the median has  been computed. In addition to numerical values, the count may include certain descriptive letters. Median ( MED) is the middle value when the numerical values 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.
RADIO  EMISSION
2 many bursis, 3 very many bursts. The daily variability index is defined as the daily mean of three-hourly indices. The following symbols are used in the tables, when inter- ference  or  radio  bursts prevented  measuring  the base-level flux  densities or determining the variability indices: w Measurement  impossible  because  of inter- ference. B Measurement impossible because of bursts. Daily  data within parentheses mean that  the observation time does not exceed one third of the period.
B2. Outstanding Occurrences at Hiraiso
The table is a list of outstanding occurrences of solar radio emission bursts observed at 200,500 and 2800 MHz during a  month. Listed in the table are the date, frequencies, the type of event, the start time and the time of maximum, both in U.T. ex- pressed in hours, minutes and tenths of a minute, the duration in  minutes,  the peak and  mean flux  densities  in 10 22  Wm 2 Hz ¹ unit, and  the polarization. The type of event is expressed by a combination of a numerical code  and  a  letter symbol  in accordance  with the " Descriptive Text of Solar Geophysical Data, NOAA " as defined  by H. Tanaka  in  the " Instruction  Manual for Monthly Report of Solar Radio Emission, WDC-C2 " in January 1975:
The polarization  is  expressed  by  the polarization degree and  sense as follows: R or L right- or left-handed polarization, W,M or S weak,moderate or strong polarization, almost zero or unable to detect polarization 0 due to small increase of flux, 00 polarization degree of less than 1 percent. One of the following symbols may be attached after numerical  values, if  necessary. D u U greater than, or later than, less than or earlier than, approximate, or uncertain. B3.  Summary Plots of F 10.7  at Hiraiso The 10.7 cm solar radio flux at Hiraiso is plotted over a one month period. The 10.7 cm flux (F 10.7 ) is determined by adjust- ing  the 10.7 cm radio flux measured at  Hiraiso to the  Pentinc- ton 10.7 cm radio flux. The figure on the right-hand  side  shows the F 10.7 index estimated at Hiraiso.
C. RADIO
PROPAGATION
C1.  H.F. Field Strength at Hiraiso
Field strength observation of 15 MHz standard waves transmitted from WWV and WWVH stations which are located respectively  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  600 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 follow- ing table. The  tabulated  field strength  expressed  in dB above one microvolt per meter is the average of quasi-peak values of the incident upper sideband field intensity for 45 seconds after the universal time indicated on the table. Abbreviated symbols are as follows:
C S innuenced by,  or impossible  because of,  any artificial accident, influenced by, or impossible because of, interferences or atmospherics.
C2.  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 range  over five grades as follows: 1 very poor(very disturbed), 2 poor(disturbed), w rather poor(unstable), 4 normal, 5 good. Whole  day  quality  figure  ranged  in grades of   10, 1+, 2-, 2o, 2+, 3-, 3o, 3+, 4-, 4o, 4+, 5-, 5o  stands for an average of six-hourly quality figures of the two circuits.  Abbreviated symbols are as follows: C artificial accident, S propagational accident, U inaccurate.
The  column of conditions presents a record of  the forecast of radio propagation conditions which is applicable to forth- coming 12 hours and  broadcast  six times  par  hour  from JJY ( Japan Standard Wave ) staion. The conditions are denoted as follows: N normal, U unstable, W disturbed. Data on geomagnetic storms which are often correlated with radio propagation disturbances are tabulated based on reports from observation at Kakioka Magnetic Observatory, Japan Meteorological Agency. Time ( U.T. ) is expressed in hours and minutes ( or tenths of an 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 ….
C3.  Phase Variation in OMEGA Radio Waves at Inubo
The phase values of eight OMEGA radio signals as received at Inubo are depicted for an interval of one month, along with the phase  deviation  defined  as a deviation from a  value averaged over the six quietest day within the month. Par- ticulars  of  the received signals are given  in  the  table  below. In  each of  the  four  panels of the  figure, the phase ( φ ) is shown in the lower part and the phase deviation ( Δ $ ) is shown  in  the  upper part. The phase data are sampled  every 30 min, so the curves of the phase and phase deviation are composed of 48 data points perday. The phase delay is measured as a positive value. The  polar cap phase anomaly ( PCPA ) caused by the solar protons are well detected on the Norway signal. The start, end and  maximum times of  the  PCPA are listed in  the  table next to the figure, where the times are expressed as  day / hour & minute in U.T.. The maximum phase deviation in the list is  defined as a phase advance ( negative values in the figure ) in degrees.
C4.  Sudden Ionospheric Disturbances
a.  Short  Wave  Fade-out ( SWF) at Hiraiso The  table  of  short  wave  fade-cut ( 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 those 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  χχ. When these quantities could not  be deter- mined accurately, they are accompanied by one of the follow- ing symbols. D greater than, u 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 and X-ray flares, and solar radio burst to SWF is  marked by X, being determined with data from interchange messages  of  IUWDS and obser- vations at Hiraiso. In table ( a ) SWF, date indicates the day to which the start-time of the event belongs.
b.  Sudden Phase Anomaly ( SPA ) at  Inubo
Data  of sudden phase anomaly ( SPA ) are prepared from the records  of  phase measurement of  VLF radio  waves  re- ceived 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 -, an indistinguishable record is spaced out, and  a  multi-peak event is marked by *. The most remarkable or distinct phase advance is underlined and listed in the column of Time. In table ( b ) SPA, date indicates the day to which the start-time of the event belongs. The following letters may be attached to the value, if necessary. greater than, D E less than, U uncertain or doubtful.
HOURLY VALUES or for2 AT   W A K K A N A I COMMUNICATIONS RESEARCH LABORATORY, JAPAN HOURLY  VALUES For fEs AT ' W A K K A N A I D E C . 1 9 9 4
COMMUNICATIONS RESEARCH LABORATORY,
7
HOURLY VALUES or foF2  AT K O K U B U N J I COMMUNICATIONS RESEARCH LABORATORY, HOURLY VALUES or fEs D E C , 1 9 9 4 AT K O K U B U N J I
COMMUNICATIONS RESEARCH LABORATORY, JAPAN
HOURLY VALUES  or for2 D E C . 1 9 9 4 L A T . 31.2N LON. 130.6R AT Y A M A G A W A
COMMUNICATIONS RESEARCH LABORATORY, JAPAN
D E C . 1 9 9 4 HOURLY VALUES or fEs AT  Y A M A G A W A
AT   O K I N A W A HOURLY VALUES or foF2  " p HOURLY VALUES or fEs AT OKINAWA D E C . 1 9 9 4
COMMUNICATIONS RESEARCH LABORATORY, 30 42 - MONTHLY MEDIANS or h'F AND h ' E S D E C . 1 9 9 4 135E MEAN TIME(UTC+9H) AUTOMATIC SCALING
S T A T I O N    W A K K A N A I LAT. 45.4N LON. 141.7E STATION K O K U B U N J I LAT. 35.7N LON. 139.5E
MONTHLY MEDIANS or h'F and h'Es A U T O M A T I C  S C A L I N G 135E MEAN TIME(UTC+9H) D E C . 1 9 9 4 - S T A T I O N   O K I N A W A LAT.-26.3N LON. 127.8R

MONTHLY MEDIANS PLOT or for2

IONOSPHERIC DATA sTATION Kokubunji
IONOSPHERIC DATA sTATION Kokubunji DEC.1994  for1 (0.01MHz)    135'E MEAN TIME (G.M.T. + 9 H)
IONOSPHERIC DATA sTATION Kokubunji DEC.1994  for (0.01MHz)     135'E MEAN TIME (G.M.T. + 9 H)
I O N O S P H E R I C   D A T A STATION Kokubunji 135* E "MEAN TIME (G.M.T.p + 9   H ) D E C . 1 9 9 4 foEs (0.1MHz)
D E C , 1 9 9 4 I O N O S P H E R I C A D A T A S T A T I O N Kokubunji
I O N O S P H E R I C  D A T A  s T A T I O N  K o k u b u n j i DEC.1994  M(3000)F2 (0.01) -135'E MEAN TIME (G.M.T. .4'R LON.139'29.3'R   SHEEP  1.0NHz TO 25.0NHz IN 24.0SRC IN MANUAL SCALING < |o o |o 1 |o 2 |o 3 |o 4 |o 5 |o 6 |o 7 |o 8 |o 9 |1 0 |1 |1 2 |1 3 |1 4 |1 5 |1 6 |1 7 |1 8 |1 9 |2 0 |2 1 |2 2 |2 3 1 3 3 5 3 0 5 3 2 0 3 5 5 3 5 0 3 0 0 3 2 5 3 6 0 3 6 5 3 6 5 3 1 0 3 6 5 3 7 5 3 6 5 3 5 0 3 8 5 3 4 0 3 5 0 3 5 0 3 5 0 3 2 5 3 3 5 2 9 5 3103202903003751440325385375136535513453503653703653803653153751345350300255 U  3 27531036037535033033537037537035036035037536036037534035036037534035036037534513503300 3 2 5 3 4 0 3 2 5 3 3 0 3 5 0 3 0 0 3 6 0 3 6 0 3 6 5 3 7 0 3 4 5 3 6 0 3 7 0 3 6 5 3 7 0 3 6 5 3 7 0 3 6 5 3 4 0 3 5 0 3 1 5 3 4 0 3 2 5 1 3 5 3 5 3 0 5 3053203103453453053360370385380360370350365385360365355305400136530513151385 7 310330325365138513404003553651355340380370335135036513703603351351320325290310 8 |29 š|3 3 0|3 60|3 4 5|3 4 5|3 7 0|3 2 0|4 0 5|3 3 0|3 7 0|3 4 0|3 5 5|3 4 5|3 5 0|3 4 0|3 8 5|3 5|3 7 0|3 5 0|3 3 0|3 3 5|3 0 0|3 1 5 31513301320131013201340135013651380137013701370137513551355136013751345134013551350129013051330 1 0 3 1 0 3 0 0 3 1 5 3 3 5 3 5 3 5 3 5 5 3 9 0 3 7 0 3 6 5 3 5 5 3 5 3 5 0 3 6 0 3 5 0 3 6 0 3 5 3 6 5 3 7 0 3 2 0 3 1 5 3 6 0 3 5 0 3 4 5 1 1 3 4 0 3 5 0 3 2 5 3 2 5 2 9 5 3 2 5 3 4 0 3 7 5 3 8 0 3 6 5 3 6 0 3 6 5 3 7 0 3 9 0 3 6 5 3 6 0 2 8 5 3 0 2 8 5 3 4 0 3 3 5 3 6 0 2 9 5 1 2 3 1 5 3 2 0 3 2 5 3 8 5 3 4 5 3 1 5 3 3 3 8 0 3 7 0 3 7 5 3 4 5 3 7 0 3 5 0 3 5 0 3 5 0 3 5 0 3 5 3 8 5 3 5 3 3 0 3 1 5 3 0 0 2 9 0 3 2 0 1313203303053603603003203653375375380340365340380360385360310365360280315285 1 4 3 0 0 3 3 0 3 2 0 2 9 0 3 1 0 3 3 0 2 9 0 3 7 0 3 5 0 3 4 0 3 6 0 3 4 5 3 5 3 7 5 3 2 5 3 7 5 3 8 5 3 5 5 3 0 5 3 3 5 3 3 0 3 5 3 1 5 2 9 5 1 5 | 3 2 0 3 0 5 | 3 2 0 3 4 0 3 6 5 | 4 2 0 3 3 5 | 3 5 0 3 8 5 | 3 6 5 | 3 6 5 | 3 7 0 3 4 0 3 7 5 3 9 0 3 4 5 2 8 0 3 2 5 3 0 0 3 1 0 2 9 5 | 2 7 5 2 9 2 9 2 9 2 9 2 9 2 1 6 3 1 5 0 3 1 0 3 2 5 3 4 0 3 6 0 3 0 5 3 5 0 3 6 5 3 4 0 3 6 0 3 5 0 3 7 0 3 5 0 3 5 5 3 4 5 3 8 0 3 8 0 3 4 0 3 8 5 3 4 5 3 5 3 1 5 2 7 5 53 1 53 30 3 3 0 3 4 5 3 3 0 3 1 5 3 6 5 3 6 0 3 6 5 3 6 0 3 7 5 3 7 0 3 6 0 3 7 0 3 5 5 3 4 5 3 3 0 3 6 0 3 6 5 3 3 0 3 5 3 0 2 9 5 1 8 | 2 9 5 | 3 2 0 3 1 0 3 3 0 3 2 5 3 0 5 3 1 5 3 5 5 3 6 5 3 7 5 3 5 3 6 5 3 7 0 3 5 0 3 5 0 3 9 3 3 6 0 3 7 5 3 6 0 3 7 0 3 2 0 3 1 9 30 5 3 1 0 3 3 5 0 3 7 5 3 7 0 3 2 5 3 4 5 3 4 5 3 6 5 3 9 0 3 6 5 3 5 3 4 0               3 5 3 7 0 3 3 5 3 9 5 3 0 0 3 5 5 3 2 5 3 0 5 2 0 2 8 5 3 0 5 3 1 5 3 2 0 3 3 5 3 7 0 3 2 5 3 8 5 3 5 3 5 0 3 5 4 0 5 3 5 3 6 5 3 7 0 3 5 5 3 6 5 3 7 5 3 6 3 9 5 3 1 0 3 5 2 1 3 5 0 3 2 5 3 3 5 3 0 0 3 1 5 3 2 5 4 0 0 3 9 0 3 6 5 3 5 3 0 3 1 0 3 4 0 3 3 5 3 5 3 6 0 3 8 5 3 8 0 2 9 0 3 3 0 3 5 5 3 8 0 3 3 0 3 0 5 R J   S 2 2 3 0 0 3 2 5 3 1 5 3 7 5 3 7 5 3 4 5 2 3 3 2 5 3 2 0 2 8 0 3 1 5 3 2 0 3 6 5 3 8 5 3 8 5 3 8 5 3 8 0 3 5 5 3 8 3 8 0 3 5 5 3 8 3 8 5 3 7 0 3 7 0 3 7 0 3 7 0 3 5 3 3 0 3 4 5 3 6 0 3 2 0 3 0 0 2 4 3 1 0 3 2 5 3 1 0 3 4 5 3 6 5 3 5 0 3 6 0 3 6 0 3 3 5 3 3 0 3 3 5 3 7 5 3 2 5 3 8 5 3 4 0 3 4 0 3 3 5 3 5 3 1 5 4 1 5 3 0 0 2 5 3 1 5 2 9 0 3 2 5 1 3 4 5 2 8 5 3 1 0 3 4 5 3 6 5 3 8 0 3 7 5 3 5 0 3 1 0 3 6 0 3 7 0 3 5 0 3 6 0 3 6 0 3 5 0 3 4 5 3 6 0 3 6 5 2 9 0 3 0 5 2 6 3 2 5 3 1 0 3 2 5 3 6 5 3 6 5 3 0 3 5 5 3 8 0 3 5 3 5 3 6 0 3 6 0 3 7 0 3 7 5 3 6 5 3 8 5 3 3 5 3 0 3 6 0 3 8 5 4 1 0 2 8 5 2 9 5 2 7 3 4 0 3 1 0 3 1 5 3 1 5 3 7 0 3 7 0 3 6 5 3 6 0 3 7 5 3 6 0 3 8 0 3 8 0 3 5 0 3 1 0 3 6 5 3 8 0 3 8 0 3 2 5 3 2 5 2 9 0 3 4 5 2 9 0 3 1 5 28 3155335531532537036537034033038533037533553604053553103703653265310 95290320305310315360380350320350390330345380370355340340365335325340303 3 0 31513000305132513051320133513901360135513701335137013651370135013851335135513651360 3 0 0 3 0 5 | 2 9 5|2 9 5|3 2 5|3 1 5|3 1 0|3 1 0|3 4 0|3 8 5|3 7 0|3 4 0|3 6 0|3 7 0|3 5 0|3 5 0|3 4 5|3 5 0|3 5 5|3 8 0|3 5 5|3 5 5|3 6 0|3 4 0|2 7 5|3 0 5 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 CR7| 31| 31| 31| 31| 31| 29| 31| 31| 31| 31| 30| 31| 31| 31| 31| 31| 31| 31| 29| 31| 31 MED 31 0 3 2 0 3 2 0 3 4 0 3 4 5 3 3 0 3 4 0 3 7 0 3 7 0 3 6 5 3 6 0 3 6 5 3 5 3 6 0 3 6 5 3 6 0 3 7 5 3 5 3 5 3 5 0 3 4 5 3 5 3 1 5 3 0 0 U ♀ 3 2 0 3 3 0 3 2 5 3 5 5 3 6 5 3 5 0 3 6 0 3 8 5 3 7 5 3 6 5 3 7 0 3 7 0 3 6 5 3 7 0 3 7 5 3 6 5 3 8 5 3 7 5 3 5 0 3 6 5 3 6 0 3 5 5 3 3 0 3 1 0 |5 ♀ 3 0 0 3 0 5 3 1 0 3 1 5 3 1 5 3 1 0 3 2 5 3 6 0 3 5 5 3 5 0 3 4 5 3 4 5 3 5 0 3 5 0 3 5 0 3 5 3 6 5 3 4 0 3 1 5 | 3 0 3 2 5 3 1 8 2 9 0 2 9 5 DEC. 1994  K(3000)F2 (0.01)  COMMUNICATIONS RESEARCH LABORATORY, JAPAN
IONOSPHERIC DATA sTATION Kokubunji DEC.1994  M(3000)F1 (0.01)  135'E MEAN TIME (G.M.T. + 9 H)
IONOSPHERIC DATA sTATION Kokubunji DEC.1994  h'f2 (KM) IONOSPHERIC  DATA  sTATION  Kokubunji DEC.1994  h'F (KM) LA7.35'42.4'N LON.139'29.3'E   SHEEP  1.0MH: 70 25.0MH: IN 24.0SEC IN MANUAL SCALING " | 0 0 1 | 0 2 | 0 3 | 0 4 | 0 5 | 0 6 | 0 7 | 0 8 | 0 9 | 1 0 | 1 | 1 2 | 1 3 | 1 4 | 1 5 | 1 6 | 1 7 | 1 8 | 1 9 | 2 0 | 2 1 | 2 2 3 1,245,300,275,275,245,260,240,210,200,200,215,240,190,200,240,220,200,235,215,225,270 2 128030032530520520023912152152252002302351240230225215221027021522101240290335 3 3 7 0 3 2 5 3 0 5 2 2 5 2 5 5 2 6 0 4,315,280,240,225,255,270,265,215,225,200,190,190,190,195,225,220,230,225,220,215,230,319 5,290,285,270,245,245,285,250,230,225,205,200,195,220,210,190,220,215,210,210,215,215,255,225,30,5 6 300270280240220265250210215230215210 7,315,285,215,225,215,255,215,225,210,250,215,210,195,195,225,215,210,250,245,230,270,340,330 8 325280225255230220310210220235220245240225240205210210245255255255255310280 9 2802 652 602 702 702 602 052 102 152 252 302 052 002 302 202 52 152 202 552 202 103 402 153 50 10 28522652852502352252252052101952202102152002152252102152252252240225240230 11270 12 305280255220235255260210220225210225240215215225220195225215265310310290 13 255265280255220280265225210195205190220225230225210220240215205310275310 14 310255260265275225210220210225225225230220220235205210305225260245310310 15 290295290275210205270220210175240210250245245225210200 16 1290260250260215285250220225210220210235235215220205205235205245235270325 17 310275235240225285310220220230210205205235230210205250215220220210275335 1 8 | 3 2 5 2 7 0 2 5 5 2 6 0 2 6 0 2 7 5 3 0 5 2 2 5 2 1 0 2 2 5 2 2 5 2 2 0 2 5 2 3 5 2 1 0 2 2 5 2 1 0 2 0 5 2 3 0 2 3 5 2 4 0 2 6 0 2 8 0 19 305/280/260/230/215/215/265/220225/230/220225/210/210 201325,300,270,240,255,225,270,210,225,235,220,200,210,250,230,220,205,200,275,220,275,235,260,280, 21 1250245255305280290210205215230225210220225240235205210330280245225255315 2 2 3 5 2 8 0 2 7 5 2 1 5 2 3 0 2 2 0 2 4 5 2 2 0 2 1 0 1 9 5 2 3 5 2 1 0 2 4 5 2 1 0 2 2 5 2 0 5 1 9 5 1 9 5 2 5 0 2 3 5 2 2 5 2 3 0 3 1 5 2 3 1 2 8 0 2 7 0 2 9 0 3 1 0 2 6 5 2 2 5 2 1 0 1 9 0 2 1 5 2 0 0 2 1 5 1 9 5 2 2 5 2 1 0 2 2 0 1 9 5 2 1 0 2 1 0 2 5 0 2 8 5 2 2 5 2 3 0 2 5 0 2 8 0 2 4 12 8 0 2 7 5 2 9 5 2 5 0 2 2 0 2 3 5 2 3 0 2 1 0 2 1 5 2 2 0 2 1 0 1 9 0 2 4 5 2 3 5 2 3 0 2 1 0 2 1 0 2 1 0 2 2 3 5 2 2 0 2 6 5 2 2 5 2 9 0 25 290330275255330305235220210245250250195235245235210200235240220235375345 2 6  3 0 5 2 8 5 2 9 0 2 4 0 2 2 5 2 2 5 2 1 5 2 1 0 2 2 5 2 2 5 2 5 0 2 2 5 2 4 5 2 1 5 2 3 0 2 0 5 2 2 0 2 5 0 2 2 0 2 3 5 3 4 5 3 0 5 2 7 2 5 0 2 9 0 2 8 5 2 7 0 2 5 0 2 3 5 2 5 2 0 5 2 1 5 2 1 0 2 0 2 0 2 0 2 0 2 0 2 0 1 8 0 2 0 5 1 9 0 2 5 0 2 5 2 9 0 2 1 0 2 6 0 2 9 0
 2 8 1 2 5 0 2 6 5 2 3 5 2 5 2 5 2 29 270320315295290260220205195225210205195220230225220205230210245250290270 3013053201325265269280240210215200210210225250220215200225225205210 3112703052852503252902302052152452501235220225225240215205240205205235335340 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 1 4 1 5 1 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 curl 31 30 31 31 31 31 30 31 31 31 31 31 30 30 30 31 31 31 30 31 31 29 31 31 ksロ2 9 0 2 8 0 2 7 5 2 5 2 4 5 2 5 2 3 5 2 1 0 2 1 5 2 2 5 2 2 0 2 1 0 2 2 5 2 2 5 2 2 5 2 2 5 2 1 0 2 3 9 2 2 5 2 2 8 2 3 8 2 7 0 3 0 5 V ♀ 3 1 0 3 0 0 2 9 0 2 7 0 2 6 5 2 8 0 2 6 5 2 2 0 2 3 0 2 2 5 2 2 5 2 3 5 2 3 5 2 3 0 2 2 5 2 1 5 2 5 0 2 4 0 2 5 5 2 6 2 3 1 0 3 2 5 1 9 2 7 0 2 7 0 2 5 5 2 4 0 2 2 0 2 5 2 2 5 2 1 0 2 1 0 2 0 2 1 0 2 0 5 2 0 5 2 1 0 2 1 5 2 1 5 2 0 2 2 5 2 1 5 2 2 0 2 2 5 2 5 0 2 0 COMMUNICATIONS RESEARCH LABORATORY, JAPAN DEC . 1 9 9 4  h ' r  (KM) IONOSPHERIC DATA sTATION Kokubunji DEC.1994  h'E (KM)
IONOSPHERIC DATA sTATION Kokubunji DEC .1994  h'Es (KM)        135'E MEAN TIME (G.M.T. + 9 H) IONOSPHERIC DATA sTATION Kokubunji DEC.1994  TYPES OF ES I  I  135'E MEAN TIME (G.M.T. + 9 H)
O GROUP H D M in  mone : . " ( " ) , 
三三1932 68 ! ! ! o a c . mana OK HIMI STREOLS 1222 """ : , . . . ... SYNDILI
 REFERE . ic  a common ou . ... , : 
5555555
 51000 " " inno ! ! ! : " " " " " " " time 2016 B. Solar Radio Emission B1. Daily Data at Hiraiso
Not available until system improvement is completed. B. Solar Radio Emission B1. Daily Data at Hiraiso 500 MHz
Note: No observations during the following periods. 7th 2205 - 8th 0508
December 1994
A vertical grid space corresponds to a 100 sfu.
Elevation angle range ≥ 6°. uuv ) ( UPPER  SIDE-BAND  OF H.F. FIELD STRENGTH C 1 . 15 MHZ F R E Q U E N C Y 1994 4.5 M RECEIVING  ANTENNA  ROD 80 HZ BANDWIDTH H I R A I S O M E A S U R E D  A T 14月15月15月17月18月19月39月39月39月39月998  948  998  998  948  958  998  978  998  198  198  198 DYY - -27 -27 - -18 - 27 BS -27 -275 272 -2 EST 275 -27 -27 -27 -27 - 27 -27 -27 -27 -27 -27 282 -レン-7 2528 5:40
-- – 2 -レ-4 -28 252 200
- 200 -25 -ra 228 2525 sses -28 son -29 -28 -28 -28 -28 2 -28 -28 -28 -252 sess -7 528 - 2 -2 520 222 2000
- ESB 252 2022 -28 -28 -28 576
1- 2002 SS
List ess 5 3 -228   - 11 21:20 200
-- -28 -28 222 - 6 -4 -25 -6 -28 -28 ers -28 -28 -28 -28 -28 -28 -28 -13 -6 E20 -28 -10 2012 202 - 2 ESS -28 -28 - 2 2525 ESSO stor -28 -28 -28 -28 -28 -28 -28 -28 -13 -28 5 02-28 -28 -28 -2 – 6 -2 - 2 -28 -28 -28 5:25
- 5:25
-- 2525 252
|- -28 -28 -28 -28 -28 B20 252
1- -2 -28 -28 6 c C C -28 -28 -28 -19 -13 c C C -7 -28 -28 C c C c SSR
E-1- -7 5:00
1-4 -2 C C 7 -28
 128 - 13 -28 -28 -28 222 -7 25年-28
ES -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 . - 7 ・ - 28 -7 8 -28 -28 -28 -28 -19 -19 2525 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 2282 -20 2528 -13 -28 g 28 - 28 -29
-29 - 10 28 - 28 -28
ESB -7 ses
Li 202 -28 -28 -28 -28 2528 sess - 1 0 -28 -28 - 4   -28 520 sta -28 -28 -28 - 7 -4 -28 -28 -28 -28 -28 -28 -28 -28 -28 2022 -13 -28 11 sess
1 25年202 -19 -4 -8 6 -4 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 252 12 stan -28 -28 -28 -28 - 7 -3 -7 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 E4 -28 -28 -28 ES 0 13 200
リ-22 28-28-28 21:2 -19 1 6 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -7 -28 14 -28 -28 -28 - 7 -2 -28 -28 -28 2122 2:25
- -28 252
- 1 -28 -28 5:56
| -レス
ウィンズ
レ---- -28 -28 -28 -2 -28 15 -28 -28 -10 -28 -28 -28 - 2 -28 -28 -28 -28 -3 -28 -28 -28 -28 -28 -28 -28 7 -19 -28 0 -13 16 ES -28 -28 - - 7 -3 ser 252 -7 -28 -28 -28 202 -28 ss
 195 -13 -28 -28 2005 202 252 -19 -28 17 5:28 -28 -28 -28 -28 -13 -24 see
ケースsee -28 -28 -28 -28 -28 -28 2525 -281-28 es 578
- ESS -28 -28 0 18 -28-28

-28 -ES -28 -28 -28 ses -28
528 -28 -28 -28 ers ESB -28 -28 -28 -28 -28 202になる。
リスSSS
 - 20 --- -7 19 -28 -28 -28 -28 -28 -28 -13 -2 -4 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -25 20 -13 -4 ESSO -28 -28 -28 -28 28-28

E28-28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 2 21 202 2528 -5 -28 -28 see
| 555 252 -2 21:52
| s 20 ESS ES

2012年2125になるレッド2:25 -28
ES28 SSR
1- 2022 | -28 | -28 22 ES 28-28

1528-28 - 4 sso
| -10 see g= 2525 2019となる。
 1 252 ES 
したとSSR
1 520
- 212となる。
1 s sになる528
- ES 88 258
- 2528
-- -4 23 122 -28 0 -2 2022 es 28
- - 225 258
 –んで
レスE28 - 19 200 228 228
-- 28 - 28 528
528
528 202 200 5:00
1,000 24 252 -27 -27 -27 -12 -6 - 18 -27 -27 ESTS ST
 1 -27 -27 EST - 275
1- -27 -27 -27 -27 - -27 -27 -27 25 ES7 -57 -27 -27 -27 -18 -18 -12 str EST str | -27 -27 -27 EST -27 -27 -27 -27 -27 -27 -27 ES7 -27 26 -27 -27 1577 EST -18 -12 -12 275
1 s:15
- -27 ES7 EST - 27 -27 E27 -27 -27 -27 -18 -27 -27 -27 27 -18 -18 ES7 STE ntレー EST s of -27 ES7 575
1 ss -27 -27 EST -27 -27 ES7 -27 -27 -27 -18 -18 -18 28 526 -27 -27 -27 ESTI - ss -27 - -27 - ESS ES7 -27 es -27 E27 -27 ES7 -27 s 17 -12 -27 -27 29 ES7 - -3 ES - -27 - 3 -27 -27 ESE -27 -27 -27 -27 ES7 -27 - 27 - -27 -27 -18 -18 -27 30 -27 -27 −18 -27 -27 -27  -27 -27 -27 -27 -27 -27 -27 -27 -6 -27 -27 -27 -27 -27 -27 -27 31 -6 31 31 3 l 31 31 31 31 3 1 3 l 31 31 31 30 30 30 30 30 30 30 30 30 30 30 CNT 30 25:22 57年222 sea
1 - 199 -18 S:20
- -5 -7 -100 -28 200 500
1 -ろう。
行え-285 17年200 202 202 ses 2022 252
1 - MED -13 -28 -27 272- EST -57 - 11 0 -27 - EST -27 ES7 EST -27 EST E27 sh STE -27 -27 -13 U D - - 19 -28 -28 -28 202 sses -28 -28 -28 5450 202 -28 -28 -28 -28 -28 -28 -28 -28 -28 -28 L D D E C
Cl. H.F.  FIELD  STRENGTH ( UPPER  SIDE-BAND  OF  WWW ) D E C 1994 F R E Q U E N C Y 15 NHZ BANDWIDTH  80 HZ RECEIVING  ANTENNA  ROD 4.5 M MEASURED  AT  HIRAISO 98n 96n 96n 96n 96n 96n 96n 96n 98n 98n 18n 17n 12H 13H 5 -27 272 6 3 -27 7 7 -5 -27 -27 EST ES7 EST 30 30 30 30  30 30 30 30 30 30 31 31 31 31 3 1 31 31 31 31 31 31 31 6 -14 -28 -28 2520 2000 6 7 SSES 5:00
-2 552
1 200 - 222 - -25 -わせ
イ3 4 6 6 -4 -27 - ES -27 -23 11 =5 13 5 13 - sure -27 -27 -27 - 2 S -6 11 g 13 13 3 -19 -28 -28 -28 -28 -28 3 -- ss
 19 -28 -28 -28 -28 2000 -25 -52 -28 BST -4 -2 -2 DAY 46N 46N 46N 46N 18H 19H 26H 21H 22H 23H 1 -2 6 1.4 5 2 -5 6 8 11 A 8 g 7 3 8 3 8 10 6 8 4 8 9 10 6し6 5 5 8 7 6 6 g 6 3 6 13 g 6 3 6 11 c c c 7 A 8 6 8 3 6 -2 -2 g - 2 6 -2 - 2 10 8 8 13し11 3 6 3 13 12 3 g 3 6 13 9 T g 6 14 6 1 9 9 8 -2 8 6 4 6 2 6 10 3 -4 8 19 5 -2 - 2 8 20 8 8 g -2 5 -2 3 - 4 6 6 -2 -19 7 -2 13 13 3 7 4 26 3 -6 0 13 27 8 1 14 4 28 7 1 2 3 29 7 12 g 7 30 A 9 10 7 31 -3 2 3 g CNT 30 30 MED 6 8 U D 9 12 L D -2 3 C2. Radio Propagation Quality Figures at Hiraiso Time in U.T.
I n u b o (d e g . ) 100 △ φ NORWAY -  13.6 kHz December - 1994 8 WIN A THE ATTW - 100 -200 400 φ 200 ^^^ 8 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Δ φ (d o g , ) NORTH DAKOTA 1.3 , 16 k H s 100 a My/ VM - ! 00 -200 400 φ 200 1 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 (d e g . ) L I B E R I A  - 1 3. 6 k H 2 Δゆ100 a - 100 -200 φ 480 200 2 (d e g . ) Δ φ JAPAN .---1 3. 6 100 8 wr whether to the res v - ) { - -100 -200 400 e 200 /// a 2 5 7 a 9 10 11 12 13 14 15 16 17 18 19 28 21 22 23 24 25 26 27 28
December a1994
I n u b o (d e g . ) 1.3.6 HAWAI I 1 0 0 Δ Φ 0 - 100 -200 400 $ 200 o 17 18 19 20 15 16 1.4 Δ φ (d e g . ) k H z 1 3. 6 R E U N I O N L A 100 a tosti -100 -200 408 φ 200 a △ Φ (d e g , ) AUSTRALIA - 13.6 kHz 100 o - ! 00 -200 400る208 8 15 14 1 3 (d e g . ) 1 3. 6 ARGENTINA - 1 0 0 Δ φ o -100 -200 488 φ 200 8 27 28 24 25 26 20 21 23 17 18 19 22 16 15 l 4 s g 11 12 13 10 2 i Polar Cap Phase Anomaly (PCPA) on Norway-Inubo Circuit NONE
(a) Short Wave Fade-out (SWF) at Hiraiso Hiraiso
CO:Colorade(WWV) HA:Hawaii(WWVH) AUS:Australia MOS: Moscow BBC: London * Optical and X-ray Flares
IONOSPHERIC  DATA  IN JAPAN  FOR  DECEMBER   1994 F-552  Vol.46  No.12 (Not for Sale)電離層月報（1994年12月）第46巻第12号(非売品) 1995年3月20日 印刷1995年3月25日  発行郵政治省通信総合研究所所
〒184東京都小金井市真井北町４丁目２一１ TR（0423）（21）1 2 1 1（代） Queries about "lonospheric" Data in Japan" should be forwarded to I Communications Research Laboratory, Ministry of Posts and Telecommunications, 2-1 Nukui-Kitamachi 4-chone, Koganei-shi, Tokyo 184 JAPAN.