Ion density and transport in the upper ionospheres of Mars and Venus

Details Ion density and transport in the upper ionospheres of Mars and Venus Ion density and transport in the upper ionospheres of Mars and Venus

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..781f&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

ABSTRACT Observations by the Pioneer Venusmission have established that the dynamic pressure of the solar wind is usually balanced by the induced magnetic pressure at the ionopause of Venus[1]. This result has recently been confirmed for Mars by observations of the MARSIS and ASPERA-3 experiments on board Mars Express [2]. While these observations also included the density of electrons in the upper ionosphere, the role of heavy ions for the physics of the ionopause has not yet been resolved - mainly because the measurement of heavy ions with energies below 20eV is experimentally challenging. We report on the observations of heavy ions at altitudes above 250kmby the ASPERA experiments onboardMars and Venus Express and on methods to derive absolute ion densities and fluxes from these observations. We further discuss the role of heavy ions for the physics of the ionopause and their interaction with the induced fields. References [1] Russell, C. and Vaisberg, O. (1983) ,in Venus, UArizona Press.. [2] Dubinin, E. et al. (2008), GRL, accepted for publication.

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