Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa33c..08b&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SA33C-08
Physics
5421 Interactions With Particles And Fields, 5435 Ionospheres (2459), 6225 Mars, 6295 Venus, 7807 Charged Particle Motion And Acceleration
Scientific paper
Suprathermal electron measurements have been recently made at both Venus and Mars by several spacecraft. Directional information in the form of pitch angle distributions are particularly useful because they allow us to probe magnetic field topology near planets, as well as the physical processes affecting plasma populating magnetic flux tubes. We will present angular electron distributions measured at both Mars and Venus. We analyze measurements made by the magnetometer and electron reflectometer (MAG/ER) on Mars Global Surveyor over a period of more than six years to identify the locations of open and closed magnetic field lines near Mars, and variability with respect to solar wind pressure and the direction of the interplanetary magnetic field. At Venus we discuss the utility of electron angular distributions for determining when draped solar wind magnetic field lines intersect the collisional atmosphere, and present recent progress made toward construction of pitch angle distributions from the Venus Express magnetometer and electron sensor (MAG and ASPERA-4 ELS).
Barabash Stas
Brain David Andrew
Frahm Robert
Halekas Jasper S.
Lin Robert P.
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