Computer Science – Sound
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3723102d&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 23, CiteID L23102
Computer Science
Sound
Planetary Sciences: Solar System Objects: Mars, Ionosphere: Planetary Ionospheres (5435, 5729, 6026), Ionosphere: Ionospheric Irregularities
Scientific paper
Radar soundings from the Mars Express spacecraft occasionally show ionospheric and surface echoes that overlap in frequency. For specular reflection from a horizontally stratified ionosphere such a frequency overlap is not possible, since ionospheric and surface reflections can only occur at frequencies below and above the maximum ionospheric plasma frequency, respectively. In this paper we show that such overlapping echoes are only observed near the terminator where strong horizontal gradients are present in the ionosphere. Using a simple ionospheric propagation model we show that the observed frequency overlaps are consistent with current estimates of the horizontal gradients near the terminator.
Duru Firdevs
Gurnett Donald A.
Morgan Daniel
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