Venus Ions Loss as Seen From ASPERA-4 Data

Details Venus Ions Loss as Seen From ASPERA-4 Data Venus Ions Loss as Seen From ASPERA-4 Data

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..777f&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

Physics

Scientific paper

We report the total escape rates of planetary ions based on the measurements by the ion mass analyzer IMA of ASPERA-4 (Analyzer of Space Plasmas and Energetic Atoms) onboard Venus Express. The statistical study of the ion flux distributions covering the period from May 2006 up to December 2007 shows that in the reference frame referred to the solar wind convection electric field O+ ions mostly escape through a thin plasma sheet co-aligned with the convection electric field in the planetary wake. At the same time planetary H+ escape occurs via an annular area around the planetary optical shadow. The total average escape rate of all planetary ions is about 1.0 × 1025 s-1. Since these numbers are of critical importance for several fields, we present and discuss all details of the sophisticated procedure used to obtained the rates from raw measurements. 1

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