Comparison of Geosynchronous Quiet-Time Plasmaspheric Density Structure with
IMAGE EUV Observations

D. Galvan (UCLA, Los Angeles, CA 90095), E. Winegar, M.B. Moldwin, 
J. Goldstein, B. Sandel, and M.F. Thomsen

The plasmasphere during quiet geomagnetic intervals shows a surprising
amount of azimuthal structure. A comparison of simultaneous data from six
LANL Magnetospheric Plasma Analyzers in geosynchronous orbit with IMAGE EUV
data allows for the quantitative comparison of the density of the outer
plasmasphere as a function of MLT. Episodes when one or more LANL satellites
observed long intervals of plasmaspheric plasma are compared to IMAGE EUV
observations to place the in situ observations into a global context. This
allows the identification of co-rotating and quasi-stationary structures in
the outer plasmasphere and allows us to quantify the density gradients
observed by IMAGE EUV. Several case studies from 2001 to 2003 are presented.

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Presentation at the Yosemite Conference of Inner Magnetospheric Interactions,
3 - 6 February 2004, Yosemite, California, USA