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

Journal Article · · Annales Geophysicae (Online)
 [1];  [1];  [2];  [3];  [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [5];  [6];  [3];  [3];  [7];  [7]
  1. Boston Univ., MA (United States)
  2. Boston Univ., MA (United States); Univ. of California, Los Angeles, CA (United States)
  3. The Aerospace Corp., El Segundo, CA (United States)
  4. Univ. of Iowa, Iowa City, IA (United States)
  5. Univ. of New Hampshire, Durham, NH (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  7. Univ. of Minnesota, Minneapolis, MN (United States)

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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1463509
Report Number(s):
LA-UR-18-25090
Journal Information:
Annales Geophysicae (Online), Vol. 36, Issue 3; ISSN 1432-0576
Publisher:
European Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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