Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.p31a..02c&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #P31A-02
Physics
1517 Magnetic Anomaly Modeling, 1532 Reference Fields (Regional, Global), 1545 Spatial Variations (All Harmonics And Anomalies), 5440 Magnetic Fields And Magnetism, 5443 Magnetospheres (2756)
Scientific paper
The data collected by the magnetometer experiment aboard the Mars Global Surveyor since 14 September 1997 have been used by numerous investigators to define the structure of that field, which has turned out to be only of crustal origin to the accuracy of the observations. The various techniques used include representations by spherical harmonics of the global potential function, averages of field at altitude, or by magnetized elements at the surface. Data were collected from the highly elliptical braking orbits down to an altitude of 102 km from the planet's surface during mainly daytime conditions. Such data were found to contain contributions from the interactions of the planetary atmosphere with the solar wind, including ionospheric currents so generated. After being placed into a ``mapping'' orbit in March 1999 it was then possible to utilize data from the dark side, presumably nearly free of such external influences, but the lowest altitudes were no less than about 365 km and ranged up to about 435 km. The local times since then have been kept to nearly 2 pm and 2 am for non--polar latitudes. This review evaluates the accuracy of the models and maps of field, and estimated magnetization parameter derived from the data and models.
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