1.宇宙観測 : 太陽・地球系空間観測 : 1.2「あけぼの」衛星の成果(<小特集>衛星を使った宇宙プラズマの測定)

概要

論文の詳細を見る
In this paper, some selected results from AKEBONO satellite observations are reviewed. One result pertains to mid-altitude ( - 1.5R_e) electron and ion signatures of the plasma sheet relevant to premidnight discrete auroras, and the other regards an important role of the ionosphere to the supply of the plasma sheet population. Examples of the electron and ion distribution functions, which indicate that the parallel potential drops exist both above and below the satellite altitude over bright auroras are presented. Meridional structure of electric potentials relevant to premidnight discrete auroras is proposed on the basis of the temporal/spatial variation of particle distribution functions. Ions of ionospheric origin are accelerated upward in association with the electric potential drops, which can supply the ionospheric ions to the plasma sheet. The AKEBONO observations have also revealed the altitude structure of the polar wind evolution. It is shown that the polar wind can carry heavy ionospheric ions (He^+, 0^+) in addition to light H^+ ions.
社団法人プラズマ・核融合学会の論文
1996-01-25