17:15 〜 18:30
[PEM06-P08] Flapping current sheet motions excited by non-adiabatic ions in near-Earth magnetotail
キーワード：current sheet , flapping, non-adiabatic ions
The current sheet is a crucial region of the magnetotail, where energy reserve and release take place. The origin of the up-down motions of the current sheet, referred to as flapping motions, is among the most fundamental issues of magnetotail dynamics. Obervational evidences suggest that the flapping motion is a kind of internal excited kink-like waves, but its particular propagating featueres such as the low phase speeds and the propagating direction from the tail center toward flanks do not match any local generation mechnisms prevrioudly established so far. Here we report observations of the current sheet flapping motions induced by non-adiabatic ions in the magentic field configurations with a finite guiding component, whose population present periodic hemispherical aymmetries.