Van Allen Probe measurements of the electric drift E × B/B2 at Arecibo's L = 1.4 field line coordinate

TitleVan Allen Probe measurements of the electric drift E × B/B2 at Arecibo's L = 1.4 field line coordinate
Publication TypeJournal Article
Year of Publication2016
AuthorsLejosne, S, Mozer, FS
JournalGeophysical Research Letters
Volume43
Issue13
Pagination6768 - 6774
Date Published07/2016
Keywordscorotation; electric field; Inner radiation belt; Ionosphere; plasmasphere; Van Allen Probes
AbstractWe have used electric and magnetic measurements by Van Allen Probe B from 2013 to 2014 to examine the equatorial electric drift E × B/B2 at one field line coordinate set to Arecibo's incoherent scatter radar location (L = 1.43). We report on departures from the traditional picture of corotational motion with the Earth in two ways: (1) the rotational angular speed is found to be 10% smaller than the rotational angular speed of the Earth, in agreement with previous works on plasmaspheric notches, and (2) the equatorial electric drift displays a dependence in magnetic local time, with a pattern consistent with the mapping of the Arecibo ionosphere dynamo electric fields along equipotential magnetic field lines. The electric fields due to the ionosphere dynamo are therefore expected to play a significant role when discussing, for instance, the structure and dynamics of the plasmasphere or the transport of trapped particles in the inner belt.
URLhttp://doi.wiley.com/10.1002/2016GL069875
DOI10.1002/2016GL069875
Short TitleGeophys. Res. Lett.


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