Evidence for topographic effects on the Martian ionosphere

Details Evidence for topographic effects on the Martian ionosphere Evidence for topographic effects on the Martian ionosphere

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5676w&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5676

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Scientific paper

The altitudes of the electron density maximum in the Martian ionosphere, as measured by the Mariner-9 radio occultation experiment, have been analysed. The altitude of the density maximum, and the altitude of the solid surface in the occultation point, can both be expressed as the distance from the planet's center. Surprisingly, it turns out that these two planetocentric distances are positively correlated. Features in the Martian ionosphere seem to be modulated by the surface topography. This implies that the Martian surface topography directly influences the vertical distribution of electron densities in the Martian ionosphere. The altitude of the electron density maximum is also correlated with other easily distinguishable effects of solar zenith angle and dust storms. Further analysis unveiled that the effects of topography on the pressure in the lower atmosphere apparently are mapped into the upper atmosphere, where they impose climatic (chronic or permanent) features on the ionosphere.

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