Other
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.p33a..02b&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #P33A-02
Other
5440 Magnetic Fields And Magnetism, 5464 Remote Sensing, 5475 Tectonics (8149), 5499 General Or Miscellaneous
Scientific paper
Attempts have been made to estimate the position of the paleomagnetic dipole field axis of Mars using its magnetic anomalies. The results strongly depend on the accuracy of the anomalies. The immense amount of the magnetic data, measured by Mars Global Surveyor during its mapping period, provides good opportunity to derive highly accurate magnetic anomalies. We extract the least contaminated radial component of the magnetic data, and only those acquired at nighttime to further minimize contribution from the external magnetic field. The data are separated to two sets of almost equal size, acquired from March 1999 to February 2001 and from February 2002 to April 2003. The low altitude science and areobreaking phase data are not considered because they are daytime data and are contaminated by the external magnetic field. Each set of data is bined over 0.5x0.5 degree girds, and the mean value of a grid is determined. We model the source bodies of the 9 small and isolated magnetic anomalies we had previously identified, by a uniformly magnetized vertical prism of elliptical cross section using a space domain algorithm. Four models are calculated for the source body of each magnetic anomaly, as follows. The first two models are directly obtained using the two bined data sets. The other two are obtained using the low-pass filtered version of the bined data sets. For this purpose we extract the magnetic data over a given anomaly from the two bined data sets, and select their covariant parts using the Fourier domain algorithm. Assuming that a model source body is magnetized by a dipole magnetic field, we calculate the position of the dipole axis. This results in 4 paleomagnetic pole positions for each isolated magnetic anomaly. The 4 pole positions of 6 anomalies almost overlap indicating the high reliability of the pole positions. The 4 pole positions differ by no more than 10 degrees for the other 2 anomalies, indicating that the external field has minor contribution to these magnetic anomalies. The 4 pole positions of the remaining anomaly differ by as much 30 degrees, implying appreciable contribution from the external field. The pole positions show clustering in general agreement with those obtained by other investigators. We will discuss the geophysical implications of the new results.
Arkani-Hamed Jafar
Boutin Daniel
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