ION.ANT.– 84 IONOSPHERIC DATA AT SYOWA STATION (ANTARCTICA) January – December 2017 C O N T E N T S
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY TOKYO, JAPAN
This data book summarizes the results for vertical soundings of the ionosphere at Syowa Station, Antarctica in 2017. The observations were conducted by the National Institute of Information and Communications Technology.  The location of the station, specifications of the ionosonde, and symbols used in this data book are as follows:
* Geomagnetic latitude and longitude were calculated using IGRF-12 (2015) SPECIFICATIONS OF THE IONOSONDE USED AT SYOWA STATION
Note: From 2016, new type of FM/CW Ionosonde will be used for routine ionospheric observations at Syowa Station. Observer: T. Kondo Scaler: K. Fukushima OBSERVERS
a. All symbols and terminology in the tables or figures of ionospheric data are used in accordance with the URSI Handbook of Ionogram Interpretation and Reduction (second edition 1972)
b.
Characteristics of Ionosphere
fxI foF2
Top frequency of spread F traces or oblique traces. Ordinary wave critical frequency for the F2 layer. Top frequency of Es layer as reflected overhead Lowest frequency of the vertical ionospheric reflections. Minimum virtual height of the ordinary wave F trace as a whole. Symbols ( i ) Descriptive  Letters. The following letters are entered after, or used to replace, numerical values on the monthly tabulation sheets. A B C D E F G H K L M N 0 P Q R S T V Measurement influenced by, or impossible because of, the presence of a lower thin layer, for example, Es. Measurement influenced by, or impossible because of, absorption in the vicinity of fmin . Measurement influenced by, or impossible because of, any non-ionospheric reason. Measurement influenced by, or impossible because of, the upper limit of the normal frequency range. Measurement influenced by, or impossible because of, the lower limit of the normal frequency range. Measurement influenced by, or impossible because of, the presence of spread echoes. Measurement influenced or impossible because the ionization density of the layer is too small to enable it to be made accurately. Measurement influenced by, or impossible because of, the presence of stratification. Presence of particle E layer. Measurement influenced or impossible because the trace has no sufficiently definite cusp between layers. Interpretation of measurement questionable because ordinary and extraordinary components are not distinguishable. Conditions are such that the measurement cannot be interpreted. Measurement refers to the ordinary component. Spur type spread 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 atmospherics. Value determined by a sequence of observations, the actual observation being inconsistent or doubtful. Forked trace that may influence the measurement. W X Y Z Measurement influenced or impossible because the echo lies outside the recorded height range. Measurement refers to the extraordinary component. Lacuna phenomena, severe layer tilt . Third magneto- electronic component present.
( ï )
Qualifying Letters
The following letters are entered in the first column before numerical values on the monthly tabulation sheets. D E Greater than. Less than. J M 0 T U Z Ordinary component characteristic deduced from the extraordinary component . Mode interpretation uncertain. Extraordinary component characteristic deduced from the ordinary component. (Used for x-characteristics 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 )
Definitions of CNT, MED, UQ, and LQ
CNT (median count) is the number of values from which the median has been computed. In addition to numerical values, the count may include certain descriptive letters. MED (median) is the middle value when the numerical values are arranged in the order of magnitude, or the average of the two middle values if there is an even number of values. UQ (upper quartile) is the median value of the upper half of the values when they are ranked according to magnitude. LQ (lower quartile) is the median value of the lower half. I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. J A N . 2 0 1 7   f x I   ( 0 . 1 M H z ) LAT.69'00.4'S LON.039'35.4'R   SWEEP  1.0MHz TO 15.0MHz IN 15.0SEC IN MANUAL SCALING 
J A N . 2 0 1 7 fxl (0.1MHz) NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . J A N . 2 0 1 7  f o F 2  ( 0 . 1 M H z ) 45°R MEAN TIME (G.M.T. + 3 H) LAT.69°00.4'S LON.039°35.4'R   SWEEP  1.0MHz 70 15.0MHz IN 15.0SEC IN MANUAL SCALING
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN 5
I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . J A N . 2 0 1 7  f t E s  ( 0 . 1 M H z ) 45°E MEAN TIME (G.M.T. + 3 H) NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN 6 I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T .
I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . J A N . 2 0 1 7  h ' F  ( K M ) 45°E MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. + FEB.2017  fxI  (0.1MHz) LAT.69'00.4'S LON.039'35.4'R   SWEEP  1.0MHz TO 15.0MHz IN 15.0SRC IN MANUAL SCALING
F E B . 2 0 1 7 fxl (0.1MHz) NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN FEB.2017  foF2  (0.1MHz) I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . 45°R MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . FEB.2017  ftEs (0.1MHz) 45°E MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN
I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T .
FEB.2017  h'F (KM) I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. + 3 H) NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN MAR.2017  fxI  (0.1MHz) I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN MAR.2017 foF2 (0.1MHz) I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . 45°R MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . MAR.2017  ftEs (0.1MHz) 45°E MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . MAR.2017  fmin (0.1MHz) 45°R MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN MAR.2017  h'F (KM) I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. + 3 H)
M A R . 2 0 1 7 h'F (KM) NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . A P R . 2 0 1 7   f x I   ( 0 . 1 M H z ) 45°E MEAN TIME (G.M.T. + 3 H) LAT.69'00.4'S LON.039'35.4'R   SWEEP  1.0MHz TO 15.0MHz IN 15.0SRC IN MANUAL SCALING
A P R . 2 0 1 7 fxl (0.1MHz) NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN A P R . 2 0 1 7   f o F 2   ( 0 . 1 M H z ) I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . A P R . 2 0 1 7  f t E s  ( 0 . 1 M H z ) 45°E MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . A P R . 2 0 1 7  f m i n  ( 0 . 1 M H z ) 45°R MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN APR.2017 h'F (KM) I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. + 3 H)
I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . MAY 2017 fxl (0.1MHz) 45°E MEAN TIME (G.M.T. + 3 H) LAT.69'00.4'S LON.039'35.4'R   SWEEP  1.0MHz TO 15.0MHz IN 15.0SRC IN MANUAL SCALING
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . MAY 2017 foF2 (0.1MHz) 45°E MEAN TIME (G.M.T. + 3 H)
I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T .
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . MAY 2017 h'F (KM) 45°E MEAN TIME (G.M.T. + 3 H)
I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . J U N . 2 0 1 7   f x I  ( 0 . 1 M H z ) 45°E MEAN TIME (G.M.T. + 3 H) LAT.69°00.4'S LON.039°35.4'R   SWEEP  1.0MHz TO 15.0MHz IN 15.0SRC IN MANUAL SCALING
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . JUN.2017  foF2  (0.1MHz) 45°E MEAN TIME (G.M.T. + 3 H) LAT.69'00.4'S LON.039'35.4'R   SNEEP  1.0MH: 70 15.0MH: IN 15.0SEC IN MANUAL SCALING
J U N . 2 0 1 7 foF2 (0.1MHz) NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN
I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T .
J U N . 2 0 1 7  h ' F  ( K M ) I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. + 3 H) I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . J U L . 2 0 1 7   f x I  ( 0 . 1 M H z ) 45°E MEAN TIME (G.M.T. + 3 H) LAT.69'00.4'S LON.039'35.4'R   SWEEP  1.0MHz TO 15.0MHz IN 15.0SRC IN MANUAL SCALING
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN J U L . 2 0 1 7  f o F 2  ( 0 . 1 M H z ) I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . JUL.2017  fmin (0.1MHz) 45°R MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN J U L . 2 0 1 7  h ' F  ( K M ) I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. + 3 H)
I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . A U G . 2 0 1 7   f x I   ( 0 . 1 M H z ) 45°E MEAN TIME (G.M.T. + 3 H) LAT.69'00.4'S LON.039'35.4'R   SWEEP  1.0MHz TO 15.0MHz IN 15.0SRC IN MANUAL SCALING
A U G . 2 0 1 7 f x I  ( 0 . 1 M H z ) NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN
A U G . 2 0 1 7 f o F 2  ( 0 . 1 M H z ) NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . A U G . 2 0 1 7   f o F 2   ( 0 . 1 M H z ) 45°R MEAN TIME (G.M.T. + 3 H) LAT.69°00.4'S LON.039°35.4'R   SWERP  1.0MH: TO 15.0MH: IN 15.0SEC IN MANUAL SCALING I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T .
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . A U G . 2 0 1 7   f m i n   ( 0 . 1 M H z ) 45°R MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN A U G . 2017  h ' F  (KM) I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. + 3 H)
I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . SEP.2017 fxI (0.1MHz) 45°E MEAN TIME (G.M.T. + 3 H) LAT.69°00.4'S LON.039°35.4'R   SWEEP  1.0MHz TO 15.0MHz IN 15.0SRC IN MANUAL SCALING
S E P . 2 0 1 7 f x I  ( 0 . 1 M H z ) NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . SEP.2017 foF2 (0.1MHz) 45°E MEAN TIME (G.M.T. + 3 H) LAT.69'00.4'S LON.039'35.4'R   SNEEP  1.0MH: 70 15.0MH: IN 15.0SEC IN MANUAL SCALING
S E P . 2 0 1 7 f o F 2  ( 0 . 1 M H z ) NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . SEP.2017  ftEs (0.1MHz) 45°E MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . SEP.2017 fmin (0.1MHz) 45°R MEAN TIME (G.M.T. + 3 H)
SEP.2017  h'F (KM) I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. + 3 H)
I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. + 0CT.2017  fxI  (0.1MHz) LAT.69'00.4'S LON.039'35.4'R   SWEEP  1.0MHz TO 15.0MHz IN 15.0SRC IN MANUAL SCALING
0 C T . 2 0 1 7 f x I  ( 0 . 1 M H z ) NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . 0CT.2017 foF2 (0.1MHz) 45°R MEAN TIME (G.M.T. + 3 H) LAT.69°00.4'S LON.039°35.4'R   SWERP  1.0MHz TO 15.0MHz IN 15.0SEC IN MANUAL SCALING
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . 0CT.2017  ftEs (0.1MHz) 45°E MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN 0CT.2017 h'F (KM) I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C    D A T A S T A T I O N SHOWA-ST.
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN
N O V . 2 0 1 7 f o F 2  ( 0 . 1 M H z ) NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T .
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . 45°E MEAN TIME (G.M.T. + 3 H) NOV.2017  h'F (KM)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T .
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . DEC.2017 foF2 (0.1MHz) 45°R MEAN TIME (G.M.T. + 3 H)
I O N O S P H E R I C  D A T A  S T A T I O N  S H O W A - S T . DEC.2017 fmin (0.1MHz) 45°E MEAN TIME (G.M.T. + 3 H) LAT.69°00.4'S LON.039°35.4'R   SWERP  1.0MH: YO 15.0MH: IN 15.0SEC IN MANUAL SCALING
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN I O N O S P H E R I C  D A T A  s T A T I O N  S H O W A - S T . DEC.2017  h'F (KM) 45°E MEAN TIME (G.M.T. + 3 H)
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, JAPAN 2 3 2 4 2 5 2 6 2 7 2 8 2 9 1 1 1 1 2 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 7 T