A high latitude electron density model derived from image/RPI sounding

Details A high latitude electron density model derived from image/RPI sounding A high latitude electron density model derived from image/RPI sounding

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm21a..03n&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM21A-03

Physics

2700 Magnetospheric Physics, 2768 Plasmasphere, 2794 Instruments And Techniques

Scientific paper

The plasma density distribution over the polar cap is difficult to assess with insitu measurements because it is rare to have a few satellites along the same field line or geocentric direction. The existence of constant upward and downward flow of plasma, which may be directly or indirectly associated with geomagnetic activities, polar wind and/or polar rain also makes any theoretically derived polar density distribution based on the assumption of static plasma invalid. The Radio Plasma Imager (RPI) on board the IMAGE satellite uses a radio sounding technique for the remote sensing of plasma densities in the magnetosphere. In this study, the electron density is determined by inverting the R-X mode echo traces. With a new profile inversion routine, RPI data sets of IMAGE high-latitude passes over the period from May 2000 to March, 2001, covering the polar region with invariant latitudes greater than 70o, and measuring electron densities from ~1.4 to 5.0 RE were analyzed. Presented in this report are high latitude electron density profiles in solar magnetic coordinates and an empirical model of polar cap electron density distribution derived as a function of radial distance and geomagnetic activity. The derived empirical relation gives a better understanding of the variation of polar cap electron density with geocentric distance and the magnitude of the effect of geomagnetic activity on the polar cap electron densities.

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