Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa13b..01g&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SA13B-01
Physics
2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2740 Magnetospheric Configuration And Dynamics, 2768 Plasmasphere, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
Total electron content (TEC) data, obtained from radio signals sent between several low-Earth-orbiting (LEO) and global positioning system (GPS) satellites, are processed using a dipole-oriented 3-dimensional grid. The result is a series of tomographic reconstructions of topside ionosphere and plasmasphere electron density between LEO and GPS satellite orbit altitude. These tomographic density images are then compared to extreme ultraviolet (EUV) images of the He + population of the plasmasphere, taken by NASA's IMAGE spacecraft. Since singly-ionized helium in the plasmasphere is optically thin, the brightness in these EUV images is proportional to the column-integrated density of He+ ions along the line of sight. Comparisons are made between the TEC-inferred electron density and the EUV-observed He+ density at a given L-shell and Magnetic Local Time (MLT). Specifically, 3-dimensional electron densities in our tomographic TEC images are integrated along the lines-of-sight of the EUV images, producing column-integrated, 2-dimensional electron densities that can be compared with the EUV image brightness. Comparing the column integrated densities from the two different sources at various positions and times can yield improved understanding of the electron to He+ ion ratio, as well as the degree to which GPS inferred TEC data correlates with EUV image brightness over time. The EUV images also provide the plasmapause location, which is important to the interpretation of the TEC-inferred density, since the plasmapause often lies within GPS orbit. One or more case studies, centered around periods of changing geomagnetic activity, are presented. Future comparisons between TEC and EUV data could lead to an improved, three-dimensional, empirical model of plasmaspheric electron density.
Galvan David A.
Hajj G.
Mannucci Anthony J.
Moldwin Mark B.
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