Ion conics observed by AKEBONO Satellite

概要

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Some characteristics of upflowing ion conics in the polar magnetosphere are reported from AKEBONO charged particle observations. The field aligned bulk shift of upflowing ions is well correlated to an enhancement of electron precipitation even with a small scale, whereas the temperature anisotropy of upflowing ions responds to the electron precipitation in a dull way. The event we reported suggests that the parallel acceleration of ion conics is rather independent of the anisotropic heating and is most probably caused by a parallel electric field. The cone angle of upflowing ion conics decreases more slowly than expected from a simple adiabatic motion in the mirror force field. The temperature defined along the cone increases with altitude. These observation results demonstrate that additional ion energization often takes place widely along the field line.
国立極地研究所の論文