Comparing ASPERA 3/4 Pick-up Ion Signatures at Mars and Venus

Details Comparing ASPERA 3/4 Pick-up Ion Signatures at Mars and Venus Comparing ASPERA 3/4 Pick-up Ion Signatures at Mars and Venus

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p13b1322m&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P13B-1322

Physics

6207 Comparative Planetology, 6225 Mars, 6295 Venus

Scientific paper

The solar wind interacts directly with the atmospheres of planets that do not have intrinsic magnetic fields, leading to direct atmospheric escape. The Mars Express and Venus Express spacecraft measure this interaction with the ASPERA 3 and 4 Ion Mass Analyzer instruments. Energy-time spectrograms of high mass ions show dispersed energy signatures that can be associated with the ion pick-up process which depends on the conditions in the solar wind. The subject of this study is a comparison between the pick-up ion signatures seen at Mars and Venus. A survey of the data reveals that high energy pick-up signatures are more common at Venus than Mars. The features gain energy with altitude at both planets, but achieve higher peak energies at Venus. The differences in what is observed may be due to ion gyroradius effects and/or orbital sampling bias. Modeling is necessary to understand these issues.

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