Physics
Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3814104s&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 14, CiteID L14104
Physics
Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Plasmasphere
Scientific paper
We compare measurements of He+ by IMAGE/EUV with measurements of the local electron density ne by IMAGE/RPI to derive new constraints on the relative abundance of He+ in the plasmasphere. Analysis of 1067 pairs of He+ and ne determinations shows that the ratio of He+ to ne is much more variable early in the refilling process as compared to late, which may be related to interspecies differences in refilling rates. Further, the ratio is roughly constant with L for the periods studied, with a typical value of about 0.09.
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