[P-EM08] Inner magnetosphere: Latest results and new perspectives

[PEM08-01] Relativistic electron precipiations associated with the pulsating aurora

*三好 由純¹、齊藤 慎司¹、大山 伸一郎¹、栗田 怜¹、塩川 和夫¹、Turunen Esa²、Kero Antti²、Manninen Jyrki² (1.名古屋大学宇宙地球環境研究所、2.サダンキラ地球物理学研究所)

キーワード：Pulsating aurora, radiation belts

We investigate the wide energy electron precipiations from keV to MeV associated with the pulsating aurora. The EISCAT observations indicated that a few hundred keV electrons often precipitate into the middle atmosphere during the pulsating aurora. The satellite at the magnetosphere observes that intense rising tone emissions of chorus waves were observed in the magnetosphere. The chorus waves that propagate to the higher latitudes can modulate electrons for the wide energy range, and resultant precipiations take place. Our computer simulation confirmed this process; chorus waves propagating along the field line cause the wide energy electron precipitations. These precipiations have a great impact on the ion chemistory at the mesosphere. In fact, the computer simulation showed that significant enhancement of NOx and decrease of O3 occurs associated with the precipiation of pulsating aurora electrons.