Subcritical Growth of Electron Phase-space Holes in Planetary Radiation Belts

Adnane Osmane; Drew L.  Turner; Lynn B. Wilson; Andrew P. Dimmock; Tuija I. Pulkkinen

doi:10.3847/1538-4357/aa8367

Subcritical Growth of Electron Phase-space Holes in Planetary Radiation Belts

Adnane Osmane, Drew L. Turner, Lynn B. Wilson, Andrew P. Dimmock, Tuija I. Pulkkinen

Department of Electronics and Nanoengineering

Research output: Contribution to journal › Article › Scientific › peer-review

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Abstract

The discovery of long-lived electrostatic coherent structures with large-amplitude electric fields (1 ≤ E ≤ 500 mV/m) by the Van Allen Probes has revealed alternative routes through which planetary radiation belts' acceleration can take place. Following previous reports showing that small phase-space holes, with q φ/T^c _e ≃ 10^-2 10^-3, could result from electron interaction with large-amplitude whistlers, we demonstrate one possible mechanism through which holes can grow nonlinearly (i.e., γ ∝ √ φ) and subcritically as a result of momentum exchange between hot and cold electron populations. Our results provide an explanation for the common occurrence and fast growth of large-amplitude electron phase-space holes in the Earths radiation belts.

Original language	English
Article number	83
Journal	The Astrophysical Journal
Volume	846
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aa8367
Publication status	Published - 1 Sept 2017
MoE publication type	A1 Journal article-refereed

Keywords

acceleration of particles
Earth
planetary systems
plasmas
turbulence

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10.3847/1538-4357/aa8367

Osmane_2017_ApJ_846_83
© 2017. The American Astronomical Society. All rights reserved. This is the final version of the following article: Osmane, Adnane & Truner, Drew L. & Wilson, Lynn B. & Dimmock, Andrew P. & Pulkkinen, Tuija I. 2017. Subcritical Growth of Electron Phase-space Holes in Planetary Radiation Belts. The Astrophysical Journal. Volume 846, issue 1. DOI: 10.3847/1538-4357/aa8367
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abstract = "The discovery of long-lived electrostatic coherent structures with large-amplitude electric fields (1 ≤ E ≤ 500 mV/m) by the Van Allen Probes has revealed alternative routes through which planetary radiation belts' acceleration can take place. Following previous reports showing that small phase-space holes, with q φ/Tc e ≃ 10-2 10-3, could result from electron interaction with large-amplitude whistlers, we demonstrate one possible mechanism through which holes can grow nonlinearly (i.e., γ ∝ √ φ) and subcritically as a result of momentum exchange between hot and cold electron populations. Our results provide an explanation for the common occurrence and fast growth of large-amplitude electron phase-space holes in the Earths radiation belts.",

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Subcritical Growth of Electron Phase-space Holes in Planetary Radiation Belts

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