Intercalibration of Mars Express Subsurface and Ionospheric Radar Total Electron Content

Details Intercalibration of Mars Express Subsurface and Ionospheric Radar Total Electron Content Intercalibration of Mars Express Subsurface and Ionospheric Radar Total Electron Content

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p23a1617m&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P23A-1617

Physics

[5435] Planetary Sciences: Solid Surface Planets / Ionospheres, [6225] Planetary Sciences: Solar System Objects / Mars, [6929] Radio Science / Ionospheric Physics, [6994] Radio Science / Instruments And Techniques

Scientific paper

The Mars Advanced Radar for Subsurface and Ionosphere Sounding on board the Mars Express spacecraft comprises two modes: one for sounding the planetary subsurface and the other for sounding the ionosphere. Optimization of subsurface radargrams yields as a by-product the ionospheric total electron content (TEC). The ionospheric sounding mode yields the electron density profile, which can be integrated to get the TEC. Because the two modes cannot operate simultaneously, it has so far been impossible to compare the results of the two methods. Now for the first time we have implemented a mode of operation in which the instrument is switched from subsurface mode to ionospheric mode and back at four-minute intervals, allowing us to compare the two TECs for consistency on a short time scale. We find that the ionospheric method has a higher background level than the subsurface method of measuring TEC. On the dayside, near the terminator, when the TEC significantly exceeds its background level, the two methods track each other very well and agree to within about 30%. Refinement of this intercalibration may allow us to extend TEC measurements to the whole dayside of Mars.

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