Solar Polar Electron Density Lower Than Equator in 2002

Details Solar Polar Electron Density Lower Than Equator in 2002 Solar Polar Electron Density Lower Than Equator in 2002

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh32a..01j&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SH32A-01

Physics

6900 Radio Science, 6969 Remote Sensing, 6979 Space And Satellite Communication, 7509 Corona, 7599 General Or Miscellaneous

Scientific paper

In 2002, Cassini was in cruise to Saturn past Jupiter and was in solar conjunction on June 21. The radio signal from Cassini was occulted by the solar corona enabling measurement of its integrated electron density along the line of sight. The point of closest of approach of Cassini's radio signal passed beneath the south pole of the sun within 2 solar radii allowing measurement of the electron density as the latitude of the point of closest approach varied. Differenced Range Versus Integrated Doppler (DRVID) data is collected by transmitting a code to the spacecraft and measuring how long it takes for the code to return. We fit a longitudinally symmetric, latitudinally varying electron density model to the Cassini 2002 DRVID data and compare to the spherically symmetric electron density model. We find that the electron density is lower over the polar regions than over the equator in 2002.

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