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Comprehensive Observations of Substorm‐Enhanced Plasmaspheric Hiss Generation, Propagation, and Dissipation
Author(s) -
Liu Nigang,
Su Zhenpeng,
Gao Zhonglei,
Zheng Huinan,
Wang Yuming,
Wang Shui,
Miyoshi Yoshizumi,
Shinohara Iku,
Kasahara Yoshiya,
Tsuchiya Fuminori,
Kumamoto Atsushi,
Matsuda Shoya,
Shoji Masafumi,
Mitani Takefumi,
Takashima Takeshi,
Kazama Yoichi,
Wang BoJhou,
Wang ShiangYu,
Jun ChaeWoo,
Chang TzuFang,
Tam Sunny W. Y.,
Kasahara Satoshi,
Yokota Shoichiro,
Keika Kunihiro,
Hori Tomoaki,
Matsuoka Ayako
Publication year - 2020
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 - 10.1029/2019gl086040
Subject(s) - hiss , plasmasphere , substorm , geophysics , van allen radiation belt , physics , whistler , van allen probes , dissipation , electrojet , geostationary orbit , instability , magnetosphere , electron , earth's magnetic field , magnetic field , astronomy , thermodynamics , satellite , quantum mechanics , mechanics
Plasmaspheric hiss is an important whistler‐mode emission shaping the Van Allen radiation belt environment. How the plasmaspheric hiss waves are generated, propagate, and dissipate remains under intense debate. With the five spacecraft of Van Allen Probes, Exploration of energization and Radiation in Geospace (Arase), and Geostationary Operational Environmental Satellites missions at widely spaced locations, we present here the first comprehensive observations of hiss waves growing from the substorm‐injected electron instability, spreading within the plasmasphere, and dissipating over a large spatial scale. During substorms, hot electrons were injected energy‐dispersively into the plasmasphere near the dawnside and, probably through a combination of linear and nonlinear cyclotron resonances, generated whistler‐mode waves with globally drifting frequencies. These waves were able to propagate from the dawnside to the noonside, with the frequency‐drifting feature retained. Approximately 5 hr of magnetic local time away from the source region in the dayside sector, the wave power was dissipated toe − 4of its original level.