Along-track gradients from ST-5: Improving magnetic and thermal models of the lithosphere

Details Along-track gradients from ST-5: Improving magnetic and thermal models of the lithosphere Along-track gradients from ST-5: Improving magnetic and thermal models of the lithosphere

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm11a0297s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM11A-0297

Physics

1541 Satellite Magnetics: Main Field, Crustal Field, External Field

Scientific paper

The three-satellite ST-5 mission collected vector magnetic field observations in a string-of-pearls configuration at low (300+ km) altitudes over selected regions at mid and high-northern latitudes in early (March-June) 2006. The spin-stabilized, polar-orbiting satellites flew in the dawn-dusk meridian, and utilized miniature, high-quality, UCLA fluxgate magnetometers that were mounted on a novel boom. The mission was not designed to do geomagnetism, and contained no absolute magnetometer, no GPS, and no star camera. This technology demonstration mission tested a new miniature but high resolution sun sensor that was utilized for the despinning of the magnetic field observations (0.1 degree accuracy). Satellite location was estimated by tracking, and enhanced via post-processing to accuracies of about 0.1 km. Many of the magnetic field observations were collected in magnetically quiet times. After pre- and in-flight calibrations of this spinner, the along-track gradient of the total field derived from two of the three satellites was calculated, and exhibited favorable comparisons with the Comprehensive model (CM4) of the near-Earth magnetic field. CM4 was developed from high resolution geomagnetic field satellites such as CHAMP, Orsted, and Magsat. We utilize the gradient data to construct a model of the lithospheric magnetic field in several N-S bands of dense ST-5 coverage, and illustrate how these models can be used to improve magnetic and thermal models of the lithosphere.

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