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2018•Unpublished venueOpen access

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

Run Shi, Wen Li, Qianli Ma, S. G. Claudepierre, C. A. Kletzing, W. S. Kŭrth, G. B. Hospodarsky, H. E. Spence, G. D. Reeves, J. F. Fennell, J. B. Blake, S. A. Thaller, J. R. Wygant

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Abstract

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 of hiss wave intensity, electron flux, and 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 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 (

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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 of hiss wave intensity, electron flux, and 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 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 (

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Available abstract

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 of hiss wave intensity, electron flux, and 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 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 (

Key concepts: Hiss, Plasmasphere, Van Allen Probes, Physics, Electron, Van Allen radiation belt, Atomic physics, Population

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