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

Elektroniikan ja nanotekniikan laitos

Tutkimustuotos: Lehtiartikkeli › Article › Scientific › vertaisarvioitu

3 Sitaatiot (Scopus)

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Abstrakti

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.

Alkuperäiskieli	Englanti
Artikkeli	83
Julkaisu	The Astrophysical Journal
Vuosikerta	846
Numero	1
DOI - pysyväislinkit	https://doi.org/10.3847/1538-4357/aa8367
Tila	Julkaistu - 1 syysk. 2017
OKM-julkaisutyyppi	A1 Julkaistu artikkeli, soviteltu

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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.",

keywords = "acceleration of particles, Earth, planetary systems, plasmas, turbulence",

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AU - Osmane, Adnane

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AU - Pulkkinen, Tuija I.

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KW - acceleration of particles

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KW - turbulence

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

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