Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmgp41a..07r&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #GP41A-07
Physics
5440 Magnetic Fields And Magnetism, 6250 Moon (1221)
Scientific paper
As summarized recently by Connerney et al. (GRL, v. 28, p. 4015, 2001), the Mars Global Surveyor magnetometer experiment has obtained nearly uniform global measurements of the Martian crustal magnetic field at mapping orbit altitudes (370 - 438 km) since March 1999. In this paper, we report mapping of these data and modeling of selected magnetic anomalies using methods introduced earlier by Hood and Zakharian (J. Geophys. Res., v. 206, p. 14601, 2001). Major goals are to estimate lower limits on bulk intensities of magnetization, approximate bulk directions of magnetization, and corresponding paleomagnetic pole positions for relatively isolated anomaly sources. A single, relatively isolated, anomaly located at 14oS, 166oW (194oE) was selected for detailed modeling. This anomaly has a total field magnitude at 383 km altitude of 240 nT and is therefore one of the strongest on Mars. As a source model, we assume a uniformly magnetized circular plate located at the martian surface with an unknown thickness and radius. Results show that the surface plate required to produce these fields has a radius of 390 +/- 60 km and a dipole moment per unit area of 1.9 +/- 0.5 x 105 Amperes (19000 +/- 5000 G-cm). The inferred bulk magnetization vector has direction angles of α =25o+/- 15o, β =270o+/- 30o, where α is the angle between the local radial direction and the moment vector and β is the azimuth of the surface projection of the moment vector measured counterclockwise (looking down) about the radius vector from the local eastward direction. The corresponding north paleomagnetic pole (calculated following Hood and Zakharian) is centered on 28o +/- 10oN, 200o +/- 30o E longitude (160o +/- 30o W longitude). For comparison, we have previously modeled two anomalies in the northern polar region (ref. 2) with south paleomagnetic poles centered at 38oN, 141oW and at 61oN, 136oW, respectively. Thus, the north paleomagnetic pole position estimated for the anomaly studied here is in the same region as the south paleomagnetic poles estimated earlier for the two anomalies studied by Hood and Zakharian.
Hood Lon L.
Richmond N.
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