Martian Ionogram Scaling by the Object Tracking Method and the result in Magnetic Cusp regions based on MARSIS

Details Martian Ionogram Scaling by the Object Tracking Method and the result in Magnetic Cusp regions based on MARSIS Martian Ionogram Scaling by the Object Tracking Method and the result in Magnetic Cusp regions based on MARSIS

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa13a1881w&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA13A-1881

Physics

[2459] Ionosphere / Planetary Ionospheres, [2706] Magnetospheric Physics / Cusp, [6225] Planetary Sciences: Solar System Objects / Mars, [6974] Radio Science / Signal Processing

Scientific paper

The Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) onboard the Mars Express (MEX) spacecraft started to collect data of the Martian topside ionosphere from May 2005. By now it has obtained large amounts of ionograms. It is important to extract vertical ionospheric information effectively from the ionograms for further study. Here we propose a method called Object Tracking Method (OTM) to automatically extract the ionospheric electron density profiles by computer. The method is based on three algorithms, namely the Hough transform, region growing segmentation algorithm and moving objects detection method from video sequences, and tracking ionosphere echoes as moving objects in processing. The identification ratio of OTM for the MARSIS ionograms is estimated to be around 90%. The Object Tracking Method is used to automatically scale the topside ionogram of MARSIS. In Martian magnetic cusp regions, the result shows significant enhancement of electron density. Not only the primary electron peak density and the electron density peak height are increased but also the density along the whole electron profile is higher than ambient plasmas. The shape of the cusp structure in ionosphere depends on variation of Martian crustal magnetic field.

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