IMAGE RPI Observations of a Plasmaspheric Density Trough

Details IMAGE RPI Observations of a Plasmaspheric Density Trough IMAGE RPI Observations of a Plasmaspheric Density Trough

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm13c1612t&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM13C-1612

Physics

[2730] Magnetospheric Physics / Magnetosphere: Inner, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2768] Magnetospheric Physics / Plasmasphere

Scientific paper

We report coordinated observations of a density trough within the plasmasphere using measurements from the Radio Plasma Imager (RPI) and Extreme Ultraviolet Imager (EUV) on the IMAGE satellite and DMSP F-15 measurements. The density trough inside the plasmasphere with width of ~0.7 RE in terms of L-shell (from L~2.3 to L~3.0) was observed in situ by the RPI when IMAGE traversed the plasmasphere in the 2130 MLT sector. The density inside the trough is about 1/3 of that in the surrounding region. A 2-D electron density image constructed from the RPI active sounding measurements reveals that the density trough extends along the field to a large latitudinal dimension. Meanwhile, the DMSP F-15, circling the Earth at about 840 km altitude, almost simultaneously detected a light ion density trough at the same L-shells and in the similar MLT sector, suggesting that the observed density trough is a field-aligned structure extending from the equator to the topside ionosphere. No large westward flow is found from the DMSP F-15 observations, indicating that the observed density trough was not directly related to the subaurora ion drift (SAID).

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