Rapid Loss of Radiation Belt Relativistic Electrons by EMIC Waves

Su, Zhenpeng; Gao, Zhonglei; Zheng, Huinan; Wang, Yuming; Wang, Shui; Spence, H. E.; Reeves, G. D.; Baker, D. N.; Wygant, J. R.

doi:10.1002/2017JA024169

Title: Rapid Loss of Radiation Belt Relativistic Electrons by EMIC Waves

Journal Article · 31 August 2017 · Journal of Geophysical Research. Space Physics

DOI: https://doi.org/10.1002/2017JA024169 · OSTI ID:1438119

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^[1]; Wang, Shui ^[1];

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Univ. of Science and Technology of China, Hefei (China)
Univ. of New Hampshire, Durham, NH (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico Consortium, Los Alamos, NM (United States)
Univ. of Colorado, Boulder, CO (United States)
Univ. of Minnesota, Minneapolis, MN (United States)

How relativistic electrons are lost is an important question surrounding the complex dynamics of the Earth's outer radiation belt. Radial loss to the magnetopause and local loss to the atmosphere are two main competing paradigms. Here on the basis of the analysis of a radiation belt storm event on 27 February 2014, we present new evidence for the electromagnetic ion cyclotron (EMIC) wave-driven local precipitation loss of relativistic electrons in the heart of the outer radiation belt. During the main phase of this storm, the radial profile of relativistic electron phase space density was quasi-monotonic, qualitatively inconsistent with the prediction of radial loss theory. The local loss at low L shells was required to prevent the development of phase space density peak resulting from the radial loss process at high L shells. The rapid loss of relativistic electrons in the heart of outer radiation belt was observed as a dip structure of the electron flux temporal profile closely related to intense EMIC waves. Our simulations further confirm that the observed EMIC waves within a quite limited longitudinal region were able to reduce the off-equatorially mirroring relativistic electron fluxes by up to 2 orders of magnitude within about 1.5 h.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: National Aeronautics and Space Administration (NASA); USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1438119

Report Number(s):: LA-UR-17-31425; TRN: US1900404

Journal Information:: Journal of Geophysical Research. Space Physics, Vol. 122, Issue 10; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 36 works

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