The plasma environment of Venus: Comparison of Venus Express ASPERA-4 measurements with 3D hybrid simulations

Details The plasma environment of Venus: Comparison of Venus Express ASPERA-4 measurements with 3D hybrid simulations The plasma environment of Venus: Comparison of Venus Express ASPERA-4 measurements with 3D hybrid simulations

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..846m&link_type=abstract

European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht

Computer Science

Scientific paper

We use data of the ASPERA-4 ion and electron spectrometers onboard Venus Express to determine the locations and shapes of the plasma boundaries (bow shock, ion composition boundary and mantle) at Venus and compare our fits with previous models obtained by PVO and Venera 9, 10 observations. Additionally we investigate the variation of the terminator bow shock position as a function of the solar wind dynamic pressure and solar EUV flux. We put this data analysis into context with a 3D hybrid simulation, developed by Bagdonat and Motschmann for the interaction of solar wind with weak comets. In the hybrid model, the ions are treated as particles, whereas the Lorentz-force can act on each particle and the electrons are modeled as a massless charge neutralizing fluid. The planetary heavy ion plasma is generated by an oxygen ionosphere and exosphere adapted to a profile, which depends on the solar zenith angle (Chapman layer). We compare our simulation results with the ASPERA-4 IMA (Ion Mass Analyser) and ELS (Elecron Spectrometer) data which includes a discussion of the plasma boundaries and escape fluxes from the planet.

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