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

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2017-09-01
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Mcode
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Language
en
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Series
Astrophysical Journal, Volume 846, issue 1
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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Keywords
acceleration of particles, Earth, planetary systems, plasmas, turbulence
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Citation
Osmane, A, Turner, D L, Wilson, L B, Dimmock, A P & Pulkkinen, T I 2017, ' Subcritical Growth of Electron Phase-space Holes in Planetary Radiation Belts ', The Astrophysical Journal, vol. 846, no. 1, 83 . https://doi.org/10.3847/1538-4357/aa8367