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Cold electron heating by EMIC waves in the plasmaspheric plume with observations of the Cluster satellite
Author(s) -
Yuan Zhigang,
Xiong Ying,
Huang Shiyong,
Deng Xiaohua,
Pang Ye,
Zhou Meng,
Dandouras Iannis,
Trotig Jean Gabriel,
Fazakerley Andrew N.,
Lucek Elizabeth
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl059241
Subject(s) - plume , physics , electron , pitch angle , geophysics , landau damping , emic and etic , van allen radiation belt , van allen probes , computational physics , atomic physics , magnetosphere , plasma , nuclear physics , meteorology , sociology , anthropology
We report in situ observations by the Cluster spacecraft of plasmaspheric electron heating in the plasmaspheric plume. Electron heating events were accompanied by enhancements of electromagnetic ion cyclotron (EMIC) waves in the increased density ducts on the negative density gradient side for two substructures of the plasmaspheric plume. Electron heating is much stronger for the pitch angle of 0° and 180° than for the pitch angle of 90°. Theoretical calculations of the Landau resonant interaction between electrons and observed EMIC waves demonstrate that Landau damping of oblique EMIC waves is a reasonable candidate to heat cold electrons in the presence of O + ions in the outer boundary of the plasmaspheric plume. Therefore, this observation is considered in situ evidence of plasmaspheric electron heating through Landau damping of EMIC waves in plasmaspheric plumes.