Whistler wave generation by electron temperature anisotropy during magnetic reconnection at the magnetopause

Yoo, Jongsoo; Wang, Shan; Yerger, Evan; Jara-Almonte, J.; Ji, Hantao; Yamada, Masaaki; Chen, Li-Jen; Fox, William; Goodman, Aaron; Alt, Andrew

doi:10.1063/1.5094636

Whistler wave generation by electron temperature anisotropy during magnetic reconnection at the magnetopause

Journal Article · Thu May 23 00:00:00 EDT 2019 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5094636· OSTI ID:1543454

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Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)

Two magnetopause reconnection events of the Magnetospheric Multiscale mission with whistler wave activity are presented. The whistler mode around half of the electron cyclotron frequency is excited near the magnetospheric separatrix. In both events, there are positive correlations between the whistler wave and the lower hybrid drift instability (LHDI) activities, suggesting a possible role of LHDI in the whistler wave generation. A sudden change in the electron pitch angle distribution (PAD) function of energetic electrons is observed right after intense LHDI activity. This change in the PAD leads to temperature anisotropy in energetic electrons which is responsible for the whistler wave excitation. The measured dispersion relation demonstrates that the whistler wave propagates toward the X line nearly parallel to the magnetic field line. Furthermore, a linear analysis with the measured distribution function verifies that the whistler mode is excited by the temperature anisotropy in energetic electrons.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC02-09CH11466; SC0016278

OSTI ID:: 1543454

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 26; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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