Statistical Properties of Hiss in Plasmaspheric Plumes and Associated Scattering Losses of Radiation Belt Electrons

Whistler mode hiss acts as an important loss mechanism contributing to the radiation belt electron dynamics inside the plasmasphere and plasmaspheric plumes. Based on Van Allen Probes observations from September 2012 to December 2015, we conduct a detailed analysis of hiss properties in plasmaspheri...

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Bibliographic Details
Published in:Geophysical research letters 2019-06, Vol.46 (11), p.5670-5680
Main Authors: Zhang, Wenxun, Ni, Binbin, Huang, He, Summers, Danny, Fu, Song, Xiang, Zheng, Gu, Xudong, Cao, Xing, Lou, Yuequn, Hua, Man
Format: Article
Language:English
Subjects:
Dynamics
electron scattering
Electrons
Hiss
Jupiter
Plasmasphere
plasmaspheric plumes
plume hiss
Plumes
Probability theory
Properties
Properties (attributes)
Radiation
Radiation belt electrons
Scattering
Statistical analysis
Statistics
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Summary:Whistler mode hiss acts as an important loss mechanism contributing to the radiation belt electron dynamics inside the plasmasphere and plasmaspheric plumes. Based on Van Allen Probes observations from September 2012 to December 2015, we conduct a detailed analysis of hiss properties in plasmaspheric plumes and illustrate that corresponding to the highest occurrence probability of plumes at L = 5.0–6.0 and MLT = 18–21, hiss emissions occur concurrently with a rate of >~80%. Plume hiss can efficiently scatter ~10‐ to 100‐keV electrons at rates up to ~10−4 s−1 near the loss cone, and the resultant electron loss timescales vary largely with energy, that is, from less than an hour for tens of kiloelectron volt electrons to several days for hundreds of kiloelectron volt electrons and to >100 days for >5‐MeV electrons. These newly obtained statistical properties of plume hiss and associated electron scattering effects are useful to future modeling efforts of radiation belt electron dynamics. Key Points Plume hiss occurs concurrently with a rate of >~80%, corresponding to the highest occurrence rate of plumes at L = 5.0‐6.0 and MLT = 18‐21 Plume hiss is efficient for pitch angle scattering ~10‐ to 100‐keV electrons near the loss cone Plume hiss can drive more efficient scattering of >500‐keV electrons at higher L‐shells than normal frequency hiss at lower L‐shells
ISSN:0094-8276
1944-8007
DOI:10.1029/2018GL081863