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Modulation of Whistler Mode Waves by Ion‐Scale Waves Observed in the Distant Magnetotail
Author(s) -
Zhao Duo,
Fu Suiyan,
Parks George K.,
Chen Lunjin,
Liu Xu,
Tong Yuguang,
Li Jinxing,
Pu Zuyin,
Zong Qiugang,
Sun Weijie,
Li Shouxian,
An JianZhu
Publication year - 2020
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2019ja027278
Subject(s) - whistler , physics , ion , atomic physics , computational physics , electric field , electron , surface wave , ion acoustic wave , wave propagation , optics , quantum mechanics
Wave activities in tailward flows have been explored in the distant magnetotail at ~54 R E , where the coupling between whistler mode waves and ion‐scale waves was observed. The whistler mode waves periodically appeared at each cycle of the ion‐scale waves, and the electron distribution functions associated with the whistler mode waves showed enhancement in the direction parallel to background magnetic field. Wave analyses show that the field‐aligned electron components act as the energy source of the whistler mode waves. The ion‐scale waves are generated by the interaction of the hot ion beam with background ions. A likely candidate of the ion‐scale wave is the kinetic Alfven wave, which can generate the enhanced field‐aligned electron populations by the parallel electric field.