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Correlated observations of intensified whistler waves and electron acceleration around the geostationary orbit

Fuliang Xiao, Qiugang Zong, Zhenpeng Su, Zhaoguo He, Chengrui Wang, Lijun Tang2012年Plasma Physics and Controlled FusionIF 2.2出版社

We report correlated observations of enhanced whistler waves and energetic electron acceleration collected by multiple satellites specifically near the geostationary orbit during the 7–10 November 2004 superstorms, together with multi-site observations of ULF wave power measured on the ground. Energetic (>0.6 MeV) electron fluxes are found to increase significantly during the recovery phase, reaching a peak value by ∼100 higher than the prestorm level. In particular, such high electron flux corresponds to intensified whistler wave activities but to the weak ULF wave power. This result suggests that wave–particle interaction appears to be more important than inward radial diffusion in acceleration of outer radiation belt energetic electrons in this event, assisting to better understand the acceleration mechanism.

日本語訳

我々は、2004年11月7日から10日にかけての超磁気嵐期間中に、静止軌道付近で複数の衛星によって観測された、強化されたホイッスラー波と高エネルギー電子の捕捉に関する相関観測結果を報告する。また、地上で測定されたULF波パワーの多点観測結果も併せて報告する。高エネルギー(0.6 MeV超)電子フラックスは、回復期に有意に増加し、嵐前のレベルより約100倍高いピーク値に達することが確認された。特に、このような高い電子フラックスは、強化されたホイッスラー波活動と対応する一方、ULF波パワーは弱いものであった。この結果は、本イベントにおける外部放射線帯の高エネルギー電子の加速において、波-粒子相互作用が内向きの動径拡散よりも重要であることを示唆しており、加速メカニズムの理解向上に寄与するものである。

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Electron accelerationWhistler waves
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