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The role of electrons during chorus intensification: Energy source and energy loss
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
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2012 (English)In: Journal of Atmospheric and Solar-Terrestrial Physics, ISSN 1364-6826, Vol. 80, 37-47 p.Article in journal (Refereed) Published
Abstract [en]

The role of electrons during the shock-induced chorus intensification observed by THEMIS D on 19 November 2007 is investigated in detail. First, the electrons are accelerated through the local betatron acceleration and radial diffusion, which are primarily in the perpendicular direction and result in the positive anisotropy (T-perpendicular to > T-//) of electrons; then they are scattered through the pitch-angle diffusion, during which the electron energies are partially transferred to amplify the chorus. In the case of interest, the energy loss is more efficient for the lower-energy (15 key) electrons because they have larger density gradient along the diffusion curves. The energetic electrons act as the intermediate in this scenario. They transfer the energies carried by the interplanetary shock to the chorus. The energetic electrons injected from magnetotail are not observed; they have no contributions to the energy source in this event.

Place, publisher, year, edition, pages
2012. Vol. 80, 37-47 p.
Keyword [en]
Chorus intensification, Betatron acceleration, Pitch-angle diffusion, Interplanetary shock
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-178902DOI: 10.1016/j.jastp.2012.03.004ISI: 000304894000005OAI: oai:DiVA.org:uu-178902DiVA: diva2:542861
Available from: 2012-08-03 Created: 2012-08-02 Last updated: 2012-08-03Bibliographically approved

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Fu, Huishan
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Swedish Institute of Space Physics, Uppsala Division
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