Global view of refilling of the plasmasphere

Sandel, B. R. and Denton, M. H. (2007) Global view of refilling of the plasmasphere. Geophysical Research Letters, 34 (L17102). pp. 1-5. ISSN 0094-8276

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We use observations by the IMAGE Extreme Ultraviolet Imager (EUV) to characterize the outflow of He+ from the ionosphere to the plasmasphere under quiet conditions. The view afforded by the IMAGE orbit encompasses the entire plasmasphere in a single exposure, enabling us to examine for the first time the globally-averaged properties of plasmasphere refilling. We focus on a study period that begins with a moderate erosion event, and follow refilling during multiple orbits for a period of 69 hours. The inferred volume refilling rate, averaged over azimuth and time, ranges from ∼1 He+ cm−3 h−1 at L = 3.3 to ∼7 × 10−2 He+ cm−3 h−1 at L = 6.3 and is generally consistent with earlier, more local measurements. We show that the measured radial abundance profiles match those predicted by the Sheffield University Plasmasphere Ionosphere Model (SUPIM) for 2 ≤ L ≤ 4.

Item Type: Journal Article
Journal or Publication Title: Geophysical Research Letters
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/t1
Departments: Faculty of Science and Technology > Physics
ID Code: 6717
Deposited By: ep_importer_dcs
Deposited On: 21 Apr 2008 11:08
Refereed?: Yes
Published?: Published
Last Modified: 07 Jan 2020 02:53

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