Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm24a..04g&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SM24A-04
Physics
2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2768 Plasmasphere, 2794 Instruments And Techniques
Scientific paper
Total electron content (TEC) data, obtained from radio signals sent between the Jason-1 satellite in low-Earth- orbit (LEO) and global positioning system (GPS) satellites, are inverted using tomography to infer electron density in Jason-1's orbital plane. We then construct column density traces along the lines of sight of an extreme ultraviolet (EUV) image of the He+ population of the plasmasphere, taken by NASA's IMAGE spacecraft. In this way, we produce column integrated electron density (TEC) values aligned with IMAGE's lines of sight. Since singly-ionized helium in the plasmasphere is optically thin, the radiance of an EUV image pixel is proportional to the column-integrated density of He+ ions along the line of sight. Hence, a TEC measurement gives us a column-integrated electron density, while an EUV image brightness value is proportional to a column-integrated He+ density. By comparing the radial brightness profile from an EUV image to the line-of-sight TEC in Jason's orbital plane, we can gain insight into the behavior of He+ and electron density in the plasmasphere. Future comparisons between TEC and EUV data could lead to an improved, three-dimensional, empirical model of plasmaspheric electron density, and a better understanding of IMAGE EUV images themselves.
Galvan David A.
Hajj G.
Mannucci T.
Moldwin Mark B.
Sandel Bill
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