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Evidence of kinetic Alfvén eigenmode in the near-Earth magnetotail during substorm expansion phase
S. P. Duan; Lei Dai; Chi Wang; J. Liang; A. T. Y. Lui; L. J. Chen; Z. H. He; Y. C. Zhang; V. Angelopoulos
Department空间科学部
Source PublicationJournal of Geophysical Research-Space Physics
2016
ISSN0148-0227
Language英语
KeywordKinetic Alfvén Wave Substorm Hall Current Aurora Brightening Hall Fields
AbstractUnipolar pulses of kinetic Alfvén waves (KAW) are first observed in the near-Earth plasma sheet (NEPS) associated with dipolarizations during substorm expansion phases. Two similar events are studied with Time History of Events and Macroscale Interactions during Substorms (THEMIS) observations during substorms on 3 February 2008 and 7 February 2008. The unipolar pulses were located at a trough-like Alfvén speed profile in the northern plasma sheet at a distance of 10–11 REfrom Earth. The dominant wave components consist of a southward δEz toward the neutral plane and a +δBy toward the dusk. The |δEz|/|δBy| ratio was in the range of a few times the local Alfvén speed, a strong indication of KAW nature. The wave Poynting flux was earthward and nearly parallel to the background magnetic field. The pulse was associated with an earthward field-aligned current carried by electrons. These observational facts strongly indicate a KAW eigenmode that is confined by the plasma sheet but propagates earthward along the field line. The KAW eigenmode was accompanied by short timescale (1 min) dipolarizations likely generated by transient magnetotail reconnection. The observed polarity of the KAW field/current is consistent with that of the Hall field/current in magnetic reconnection, supporting the scenario that the Hall fields/current propagate out from reconnection site as KAW eigenmodes. Aurora images on the footprint of THEMIS spacecraft suggest that KAW eigenmode may power aurora brightening during substorm expansion phase.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5425
Collection空间科学部
Recommended Citation
GB/T 7714
S. P. Duan,Lei Dai,Chi Wang,et al. Evidence of kinetic Alfvén eigenmode in the near-Earth magnetotail during substorm expansion phase[J]. Journal of Geophysical Research-Space Physics,2016.
APA S. P. Duan.,Lei Dai.,Chi Wang.,J. Liang.,A. T. Y. Lui.,...&V. Angelopoulos.(2016).Evidence of kinetic Alfvén eigenmode in the near-Earth magnetotail during substorm expansion phase.Journal of Geophysical Research-Space Physics.
MLA S. P. Duan,et al."Evidence of kinetic Alfvén eigenmode in the near-Earth magnetotail during substorm expansion phase".Journal of Geophysical Research-Space Physics (2016).
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