Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p11e1616k&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P11E-1616
Physics
Plasma Physics
[2400] Ionosphere, [2487] Ionosphere / Wave Propagation, [7800] Space Plasma Physics
Scientific paper
The MARSIS subsurface sounder occasionally detects sequential parabolically shaped echoes that appear to originate below the Martian surface. This unique echo pattern is similar to what one would expect from a buried basin with multiple ridges at different distances from the center of the basin, much like the seating levels of a colosseum. These echoes were originally interpreted as indicative of craters buried by dust and debris, however, this was called into question when they were not observed in subsequent orbits over the same region. Because the echo pattern is not always present on subsequent orbits, they are now believed to be of ionospheric origin, which is the subject of this study. We present a possible ionospheric geometry in the shape of a plasma hole, and perform ray tracing calculations which show that the essential features of the observations can be reproduced by refraction of the radar signal near the boundary of the plasma hole.
Gurnett Donald A.
Kane M. V.
Menietti Douglas J.
Morgan Daniel
Plaut Jeffrey J.
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