IMAGE and DMSP observations of a density trough inside the plasmasphere

Details IMAGE and DMSP observations of a density trough inside the plasmasphere IMAGE and DMSP observations of a density trough inside the plasmasphere

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11507227f&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A7, CiteID A07227

Physics

5

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

Scientific paper

We report coordinated observations of a density trough within the plasmasphere using the measurements from the radio plasma imager (RPI) and extreme ultraviolet imager (EUV) on the IMAGE satellite and the measurements from DMSP F-15. The density trough inside the plasmasphere with a width of ˜0.7 RE in terms of L shell (from L ˜ 2.3 to L ˜ 3.0) was observed in situ by RPI when IMAGE traversed the plasmasphere in ˜2130 magnetic local time (MLT) sector. The plasmasphere images taken by the IMAGE EUV instrument confirm that the density trough is inside the plasmasphere. A 2-D electron density image constructed from the RPI active sounding measurements reveals that the density trough extends along the magnetic field from the IMAGE orbit to at least 41° magnetic latitude. Meanwhile, the DMSP-F15 satellite, circling the Earth at about 850 km altitude, detected a light ion density trough at the same time on the same L shells and similar MLT sector. The coordinated observations with the IMAGE and DMSP-F15 satellite demonstrate, for the first time, that the density trough is a low-density plasmaspheric structure extending from the plasmasphere to the topside ionosphere along the geomagnetic field lines.

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