<論文>科学衛星TAIYO-RPAによる低緯度電離層の観測結果

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The aeronomy satellite TAIYO was launched on February 24, 1975, into an orbit with an inclination of 31°, perigee of 250 km, apogee of 3100 km and period of 120 min. The ionospheric F region and the topside ionosphere in the low latitudes have been observed during sunspot minimum, 1975-76, by the retarding potential analyzer which was included in the satellite TAIYO payloads. The main results deduced from the analysis of the stored data of a total of 117 paths indicate that, firstly, a semi-empirical formula of the O^+ - H^+ ion transition height where O^+ density is equal to H^+ density, is obtained and is expressed as a function of the solar zenith angle and the magnetic dip angle, secondly, there very frequently exist high energy components in electrons and ions of the ionosphere over the South Atlantic geomagnetic anomaly region, 250°E - 0°E - 80°E in the daytime and the nighttime. The altitude range of the region in which there exist non-thermal components of the plasma reaches to about 800 km or more.
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