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Planetary ENA Imaging: Venus and a comparison with Mars |
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| Authors: | H. Gunell,M. Holmströ m,N.V. Erkaev |
| Affiliation: | a Swedish Institute of Space Physics, Box 812, SE-981 28 Kiruna, Sweden b Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, A-8042 Graz, Austria c Institute of Computational Modelling, Russian Academy of Sciences, 660036 Krasnoyarsk 36, Russia |
| Abstract: | We present simulated images of energetic neutral atoms (ENAs) produced in charge exchange collisions between solar wind protons and neutral atoms in the exosphere of Venus, and make a comparison with earlier results for Mars. The images are found to be dominated by two local maxima. One produced by charge exchange collisions in the solar wind, upstream of the bow shock, and the other close to the dayside ionopause. The simulated ENA fluxes at Venus are lower than those obtained in similar simulations of ENA images at Mars at solar minimum conditions, and close to the fluxes at Mars at solar maximum. Our numerical study shows that the ENA flux decreases with an increasing ionopause altitude. The influence of the Venus nighttime hydrogen bulge on the ENA emission is small. |
| Keywords: | 52.65.Kj 96.30.Ea 96.30.Gc 96.35.Hv |
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