Van Allen Probes observation of plasmaspheric hiss modulated by injected energetic electrons

Run Shi; Wen Li; Qianli Ma; Seth G Claudepierre; Craig A Kletzing; William S Kurth; George B Hospodarsky; Harlan E Spence; Geoff D Reeves; Joseph F Fennell; J. Bernard Blake; Scott A Thaller; John R Wygant

doi:10.5194/angeo-36-781-2018

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Van Allen Probes observation of plasmaspheric hiss modulated by injected energetic electrons

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Van Allen Probes observation of plasmaspheric hiss modulated by injected energetic electrons

Run Shi, Wen Li, Qianli Ma, Seth G Claudepierre, Craig A Kletzing, William S Kurth, George B Hospodarsky, Harlan E Spence, Geoff D Reeves, Joseph F Fennell, …

Annales Geophysicae, Vol.36(3), pp.781-791

05/23/2018

DOI: 10.5194/angeo-36-781-2018

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Abstract

Plasmaspheric hiss was observed by Van Allen Probe B in association with energetic electron injections in the outer plasmasphere. The energy of injected electrons coincides with the minimum resonant energy calculated for the observed hiss wave frequency. Interestingly, the variations in hiss wave intensity, electron flux and ultra low frequency (ULF) wave intensity exhibit remarkable correlations, while plasma density is not correlated with any of these parameters. Our study provides direct evidence for the first time that the injected anisotropic electron population, which is modulated by ULF waves, modulates the hiss intensity in the outer plasmasphere. This also implies that the plasmaspheric hiss observed by Van Allen Probe B in the outer plasmasphere (L > ∼ 5.5) is locally amplified. Meanwhile, Van Allen Probe A observed hiss emission at lower L shells (< 5), which was not associated with electron injections but primarily modulated by the plasma density. The features observed by Van Allen Probe A suggest that the observed hiss deep inside the plasmasphere may have propagated from higher L shells.

Details

Title: Subtitle: Van Allen Probes observation of plasmaspheric hiss modulated by injected energetic electrons
Creators: Run Shi - Boston University
Wen Li - Boston University
Qianli Ma - Boston University
Seth G Claudepierre - The Aerospace Corporation
Craig A Kletzing - University of Iowa
William S Kurth - University of Iowa
George B Hospodarsky - University of Iowa
Harlan E Spence - University of New Hampshire
Geoff D Reeves - Los Alamos National Laboratory
Joseph F Fennell - The Aerospace Corporation
J. Bernard Blake - The Aerospace Corporation
Scott A Thaller - University of Minnesota
John R Wygant - University of Minnesota
Resource Type: Journal article
Publication Details: Annales Geophysicae, Vol.36(3), pp.781-791
DOI: 10.5194/angeo-36-781-2018
ISSN: 1432-0576
eISSN: 1432-0576
Language: English
Date published: 05/23/2018
Academic Unit: Physics and Astronomy
Record Identifier: 9984199950402771

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