3.地球磁気圏における磁気リコネクション研究(<小特集>磁気リコネクション研究の到達点と課題)
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This article reviews recent progress in magnetospheric reconnection study. With the establishment of the presence of reconnection and its importance in the magnetospheric dynamics, recent interest is shifting to understanding how reconnection occurs and develops in the magnetotail and at the magnetopause. Instruments onboard new space-crafts launched in the 90's such as Geotail(Japan-US mission)are providing us with data of unprecedented high quality. These data enable us to inspect the ion particle dyamics within a reconnection jet and to resolve ion inertia scales in the proximity of a reconnection site. Combining these observational findings with simulation studies, we have come to realize the significance of ion scale phenomena in MHD scale reconnection. The best example would be the role of Hall-current loops surrounding a reconnection site in enabling fast reconnection to proceed. Having summarized the present status as above, two critical issues for the future are suggested: Understanding cross-scale coupling down to the electron scale, and generalizing the conclusion regarding the MHD-ion scale coupling obtained for the Earth's magnetosphere to other situations such as the solar corona, where the difference between the two scales is extremely large.
- 社団法人プラズマ・核融合学会の論文
- 2001-10-25
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