Mathematics – Logic
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmgp32a0190a&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #GP32A-0190
Mathematics
Logic
1517 Magnetic Anomaly Modeling, 1599 General Or Miscellaneous
Scientific paper
A reliable magnetic anomaly map at a constant altitude is essential for viable geological interpretation of the magnetic source bodies. Mars Global Surveyor has provided two sets of magnetic data, one at low altitudes of 80-200 km, and the other at high altitudes of 360-420 km. The along track measurement are at much shorter intervals. Therefore, the resolution of the data is limited due to the satellite altitude, the track spacing and the contribution from the external magnetic field. I first derived two spherical harmonic models of the magnetic anomalies, one from the low-altitude data and the other using the high-altitude data. The models are limited to harmonics of degree and order 65, because the resolution of the low-altitude data suffers from uneven distribution of tracks and the satellite altitude is the limiting factor for the resolution of the high-altitude data. The external field components of both data sets have been minimized by selecting data from night side and also averaging them over bins of 1x1 degree and 10 km thickness that tends to average out the time varying part of the external field. The two models highly correlate over harmonics of degree up to 50, with degree correlation higher than 0.9. The final magnetic anomaly map of Mars is obtained by combining the covariant harmonics of the two models that include harmonics of degree up to 50. I model some small and isolated magnetic anomalies in terms of vertical prisms of elliptical cross section to estimate the range of crustal magnetization and determine possible paleomagnetic pole of Mars.
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