Comparison of IMAGE EUV plasma plume images with LANL geosynchronous
in situ plasma observations

Moldwin, M B, Sandel, B R, Elphic, R, Thomsen, M

Images from the IMAGE EUV instrument of plasmaspheric plumes that
appear to cross geosynchronous orbit are compared with the "picture"
of plasmaspheric plasma derived from multiple geosynchronous
satellite observations. In addition, quiet intervals when
geosyncnrhounous spacecraft observed plasmaspheric plasma for
extended intervals are compared with IMAGE EUV plasmapause location
estimates. A comparison of the data is revealing the complexity and
temporal variability of the outer plasmasphere and helps put the in
situ observations into global context by separating spatial from
temporal variability. Estimates of the density gradients responsible
for the IMAGE EUV intensity gradients are also determined.