Physics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.9219g&link_type=abstract
Journal of Geophysical Research, vol. 86, Oct. 1, 1981, p. 9219-9223. NSF-Navy-supported research.
Physics
9
Birkeland Currents, Geomagnetism, Libration, Magnetic Effects, Satellite Orbits, Attitude (Inclination), Current Sheets, Magnetic Signatures, Magnetometers, Military Spacecraft
Scientific paper
Principal oscillations of the TRIAD satellite are studied in 150 passes and are identified as the librations of a gravity-stabilized satellite. The libration periods are T(O)/2 and T(O)/(3) exp 1/2, where T(O) is the orbit period of about 100 min. The amplitude and phase change over periods of a few days, sometimes vanishing altogether, and these attitude changes are numerically evaluated and removed. Data from three consecutive passes spanning over three hours show a magnetic profile which extends as far as 10 deg in latitude from a single region 1 Birkeland current sheet, confirming the permanent and global nature of large-scale Birkeland currents.
Favin S.
Gustafsson Georg
Potemra Thomas A.
Saflekos Nicholaos A.
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