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Local Generation of High-Frequency Plasmaspheric Hiss Observed by Van Allen Probes


AuthorHe, Zhaoguo; Chen, Lunjin; Liu, Xu; Zhu, Hui; Liu, Si; Gao, Zhonglei; Cao, Yong;
Keywordselectron; high frequency; local generation; Plasmaspheric Hiss; substorm injection; Van Allen Probes
AbstractThe generation of a high-frequency plasmaspheric hiss (HFPH) wave observed by Van Allen Probes is studied in this letter for the first time. The wave has a moderate power spectral density (\~10-6 nT2/Hz), with a frequency range extended from 2 to 10 kHz. The correlated observations of waves and particles indicate that HFPH is associated with the enhancement of electron flux during the substorm on 6 January 2014. Calculations of the wave linear growth rate driven by the fitted electron phase space density show that the electron distribution after the substorm onset is efficient for the HFPH generation. The energy of the contributing electrons is about 1\textendash2 keV, which is consistent with the observation. These results support that the observed HFPH is likely to be generated locally inside the plasmasphere due to the instability of injected kiloelectron volt electrons.
Year of Publication2019
JournalGeophysical Research Letters
Volume
Number of Pages1141-1148
Section
Date Published01/2019
ISBN
URLhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2018GL081578
DOI10.1029/2018GL081578