The magnetic field of the earth - Performance considerations for space-based observing systems

Details The magnetic field of the earth - Performance considerations for space-based observing systems The magnetic field of the earth - Performance considerations for space-based observing systems

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985itgrs..23..541w&link_type=abstract

IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892), vol. GE-23, July 1985, p. 541-551.

Physics

5

Geomagnetism, Satellite Observation, Earth Core, Earth Crust, Magnetic Anomalies, Magnetic Signatures, Magnetometers, Position Errors, Satellite-Borne Instruments, Solar Activity, Space Plasmas, Spatial Distribution

Scientific paper

Basic problems inherent in carrying out observations of the earth magnetic field from space are reviewed. It is shown that while useful observations of the core and crustal fields are possible at the peak of the solar cycle, the greatest useful data volume is obtained during solar minimum. During the last three solar cycles, the proportion of data with a planetary disturbance index of less than 2 at solar maximum was in the range 0.4-0.8 in comparison with solar minimum. It is found that current state of the art orbit determination techniques should eliminate orbit error as a problem in gravitational field measurements from space. The spatial resolution obtained for crustal field anomalies during the major satellite observation programs of the last 30 years are compared in a table. The relationship between observing altitude and the spatial resolution of magnetic field structures is discussed. Reference is made to data obtained using the Magsat, the Polar Orbiting Geophysical Observatory (POGO), and instruments on board the Space Shuttle.

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