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Model-observation comparison for the geographic variability of the plasma electric drift in the Earth\textquoterights innermost magnetosphere

Plasmaspheric rotation is known to lag behind Earth rotation. The causes for this corotation lag are not yet fully understood. We have used more than two years of Van Allen Probe observations to compare the electric drift measured below L~2 with the predictions of a general model. In the first step, a rigid corotation of the ionosphere with the solid Earth was assumed in the model. The results of the model-observation comparison are twofold: (1) radially, the model explains the average observed geographic variability of the ...

Lejosne, ène; Maus, Stefan; Mozer, F.;

YEAR: 2017     DOI: 10.1002/2017GL074862

corotation; electric field; Ionosphere; plasmasphere; thermosphere; Van Allen Probes; wind


Van Allen Probe measurements of the electric drift E \texttimes B/B2 at Arecibo\textquoterights L = 1.4 field line coordinate

We have used electric and magnetic measurements by Van Allen Probe B from 2013 to 2014 to examine the equatorial electric drift E \texttimes B/B2 at one field line coordinate set to Arecibo\textquoterights 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 ...

Lejosne, Solène; Mozer, F.;

YEAR: 2016     DOI: 10.1002/2016GL069875

corotation; electric field; Inner radiation belt; Ionosphere; plasmasphere; Van Allen Probes