Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....12671l&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #12671
Physics
Scientific paper
Neutral gas temperatures inferred from topside plasma scale heights of electron density distributions and Lyman-alpha dayglow observations imply much higher dependence on solar activity expressed by the solar radio flux in the exosphere of Venus and Mars. We show that the production of very low energetic hydrogen and oxygen atoms (VLENA) via photochemical reactions below the exobase lead to hot neutral particle populations which may give rise to overestimations of the exosphere temperatures observed by remote techniques. We use a Monte Carlo particle simulation for the calculation of the energy density distribution of various hot particle populations at the exobase of Venus and Mars. In addition, we study also the upper atmosphere temperature influence of energetic neutral atom (ENA) populations which have their origin in the solar wind and discuss the VLENA and ENA influence of the exosphere temperature on Mars, which would have important implications for the loss of water.
Bauer Siegfried J.
Lammer Helmut
Lichtenegger Herbert I. M.
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