Thermal electron acceleration by localized bursts of electric field in the radiation belts

TitleThermal electron acceleration by localized bursts of electric field in the radiation belts
Publication TypeJournal Article
Year of Publication2014
AuthorsArtemyev, AV, Agapitov, OV, Mozer, F, Krasnoselskikh, V
JournalGeophysical Research Letters
Volume41
Start Page5734
Issue16
Date Published08/2014
KeywordsRadiation belts; thermal electrons; Van Allen Probes; wave-particle interaction
AbstractIn this paper we investigate the resonant interaction of thermal ~10−100 eV electrons with a burst of electrostatic field that results in electron acceleration to kilovolt energies. This single burst contains a large parallel electric field of one sign and a much smaller, longer lasting parallel field of the opposite sign. The Van Allen Probe spacecraft often observes clusters of spatially localized bursts in the Earth's outer radiation belts. These structures propagate mostly away from thegeomagnetic equator and share properties of soliton-like nonlinear electron-acoustic waves: a velocity of propagation is about the thermal velocity of cold electrons (~3000−10000 km/s), and a spatial scale of electric field localization alongthe field lines is about the Debye radius of hot electrons (~5−30 km). We model the nonlinear resonant interaction of these electric field structures and cold background electrons.
URLhttp://doi.wiley.com/10.1002/2014GL061248
DOI10.1002/2014GL061248
Short TitleGeophys. Res. Lett.


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