Resonant Scattering of Relativistic Outer Zone Electrons by Plasmaspheric Plume Electromagnetic Ion Cyclotron Waves

doi:10.1088/0256-307X/26/12/129401

Chin. Phys. Lett.

2009, Vol. 26

Issue (12): 129401 DOI: 10.1088/0256-307X/26/12/129401

GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS

Resonant Scattering of Relativistic Outer Zone Electrons by Plasmaspheric Plume Electromagnetic Ion Cyclotron Waves

SU Zhen-Peng, ZHENG Hui-Nan

CAS Key Lab for Basic Plasma Science, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026

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SU Zhen-Peng, ZHENG Hui-Nan 2009 Chin. Phys. Lett. 26 129401

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Abstract The bounce-averaged Fokker-Planck equation is solved to study the relativistic electron phase space density (PSD) evolution in the outer radiation belt due to resonant interactions with plasmaspheric plume electromagnetic ion cyclotron (EMIC) waves. It is found that the PSDs of relativistic electrons can be depleted by 1-3 orders of magnitude in 5h, supporting the previous finding that resonant interactions with EMIC waves may account for the frequently observed relativistic electron flux dropouts in the outer radiation belt during the main phase of a storm. The significant precipitation loss of ~MeV electrons is primarily induced by the EMIC waves in H⁺ and He⁺ bands. The rapid remove of highly relativistic electrons (>5MeV) is mainly driven by the EMIC waves in O⁺ band at lower pitch-angles, as well as the EMIC waves in H⁺ and He+ bands at larger pitch-angles. Moreover, a stronger depletion of relativistic electrons is found to occur over a wider pitch angle range when EMIC waves are centering relatively higher in the band.

Keywords: 94.20.wj 52.35.Hr 94.30.Lr 94.30.Hn

Received: 13 May 2009 Published: 27 November 2009

PACS:	94.20.wj	(Wave/particle interactions)
	52.35.Hr	(Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))
	94.30.Lr	(Magnetic storms, substorms)
	94.30.Hn	(Energetic trapped particles)

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