Global view of refilling of the plasmasphere

Details Global view of refilling of the plasmasphere Global view of refilling of the plasmasphere

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3417102s&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 17, CiteID L17102

Physics

11

Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431)

Scientific paper

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.

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