Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990fsu..rept.....c&link_type=abstract
Progress Report Florida State Univ., Tallahassee. Dept. of Geology.
Astronomy and Astrophysics
Astronomy
Earth Crust, Earth Mantle, Geoelectricity, Geomagnetism, Magnetic Cores, Magnetic Measurement, Astronomical Observatories, Data Acquisition, Ionospheric Currents, Magsat Satellites, Pogo, Scalars
Scientific paper
The primary goal is to understand the sources of the near-Earth ambient magnetic field as observed by recent spacecraft surveys and surface variational magnetic observations so as to determine the electrical properties of the crust and upper mantle. Also included is the structure and changes on a short time scale of the core field which must be separated and identified. The Magsat data collection interval provides an opportunity to compare the vector field projections of ionospheric currents computed from surface data above the ionosphere as does the POGO data for scalar projections. The limitation of Magsat is its sun-synchronous orbit, which only sampled low latitudes at dawn and dusk, whereas POGO, though only making observations of the scalar field, sampled all local times. Magsat operated at a lower altitude than POGO (down to 350 km) whereas the orbits of the three POGO spacecraft ranged up to 1500 km and were never lower than about 400 km.
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