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Mapping the earth's magnetic and gravity fields from space Current status and future prospectsThe principal magnetic fields encountered by earth orbiting spacecraft include the main (core) field, external fields produced by electrical currents within the ionosphere and magnetosphere, and the crustal (anomaly) field generated by variations in the magnetization of the outermost portions of the earth. The first orbital field measurements which proved to be of use for global studies of crustal magnetization were obtained by a series of three satellites launched and operated from 1965 to 1971. Each of the satellites, known as a Polar Orbiting Geophysical Observatory (POGO), carried a rubidium vapor magnetometer. Attention is also given to Magsat launched in 1979, the scalar anomaly field derived from the Magsat measurements, satellite tracking studies in connection with gravity field surveys, radar altimetry, the belt of positive free air gravity anomalies situated along the edge of the Pacific Ocean basin, future technological capabilities, and information concerning data availability.
Document ID
Document Type
Reprint (Version printed in journal)
Settle, M.
(NASA Headquarters Washington, DC United States)
Taranik, J. V.
(NASA Office of Space Science and Applications Washington, DC, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Publication Information
ISSN: 0273-1177
Subject Category
Distribution Limits
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