Statistics – Computation
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..gp22a06t&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #GP22A-06
Statistics
Computation
0903 Computational Methods, Potential Fields, 1517 Magnetic Anomaly Modeling, 1594 Instruments And Techniques, 5440 Magnetic Fields And Magnetism, 5464 Remote Sensing
Scientific paper
Very high amplitude crustal field anomalies were revealed over a significant for portion of Mars by the Mars Global Surveyor (MGS) mission. Several terrestrial crustal anomalies could be interpreted as resulting from remanent magnetization; however, since there is no ambient magnetizing field all of these Martian anomalies must be produced by remanence. In this investigation, we applied some methods and techniques developed to study the Magsat crustal magnetic field at satellite altitude to these recently acquired Martian anomaly data. Our goal is to derive the direction of magnetization and compute a virtual geomagnetic pole for selected anomalies as well as information on their likely source. The study region extends from 50° S-10° N 135° W-75° W and includes the Southern Tharsis region. Some 252 descending (night-side) orbital passes from the mapping phase of the MGS mission were examined to determine extent of contamination by external fields. A second-order polynomial was used to de-trend each orbit followed by low-pass filtering, with a 250 km wavelength cut off. Total field and component crustal anomaly maps were made at the altitude of the MGS mapping phase, 400 km. After selecting and analyzing an isolated anomaly in the southwest corner of the Tharsis area, an average direction of magnetization was computed as -10° inclination and 212° declination. Assuming a dipolar main field this yielded a virtual geomagnetic pole at 45° N,58° W. This pole lies in the eastern sector of Tempe Terra some 400 km southeast of the Tempe Fossae.
Frawley James J.
Frey Herbert V.
Ravat Dhananjay
Taylor Patrick T.
Zatman Stephen
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