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

Author
Keywords
Abstract
In 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\textquoterights 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.
Year of Publication
2014
Journal
Geophysical Research Letters
Volume
41
Start Page
5734
Date Published
08/2014
URL
http://doi.wiley.com/10.1002/2014GL061248
DOI
10.1002/2014GL061248