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Variations in ionospheric parameters during periods of minimum and maximum solar activity

V I Taran1996年Plasma Physics and Controlled FusionIF 2.2出版社

Ionospheric investigations in Ukraine are being carried out with uniquely developed incoherent scatter radars. Data on the variations in the electron density and the electron and ion temperatures during periods of low (1994) and high (1989 - 1990) solar activity are presented. The F-layer peak height ranges from 450 at night to 240 km in the daytime; the electron density maximum varies approximately from over a cycle of solar activity throughout the winter period. The electron temperature has a maximum afternoon value as the solar activity is high in summer. In the periods of magnetic disturbances, a drop in is most frequently observed. In winter, the influence of the sunrise and sunset at the magnetic conjugate point is also observed. An increase in electron temperature, a drop in electron density, and the displacement of the heated region along the magnetic field lines are clearly seen in the ionosphere irradiated by high-power, HF radiation. Longitudinal effects in the ionospheric behaviour were observed in simultaneous measurements in Kharkiv and Millstone Hill (USA).

日本語訳

ウクライナの電離圏研究は、独自に開発された非干渉散乱レーダーを用いて実施されている。太陽活動が低い期間(1994年)と高い期間(1989年〜1990年)における電子密度、電子温度、イオン温度の変動に関するデータが提示されている。F層のピーク高度は、昼間で450km、夜間で240kmの範囲にある。電子密度の最大値は、太陽活動の1周期を通じて約[数値]倍変動する。電子温度は、夏季の昼間に最大値を示す。磁気擾乱時には、[パラメータ]の低下が最も頻繁に観測される。冬季には、磁気共役点における日出・日没の影響も観測される。高電力の非干渉散乱レーダー照射による電離圏加熱では、電子温度の上昇、電子密度の低下、加熱領域の磁力線に沿った変位が明確に観測される。ハリコフ(ウクライナ)とミルストーンヒル(米国)での同時観測により、電離圏挙動における経度効果が明らかにされた。

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