Physics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....8611265k&link_type=abstract
Journal of Geophysical Research, vol. 86, Dec. 1, 1981, p. 11265-11277.
Physics
87
Earth Magnetosphere, Geosynchronous Orbits, Magnetic Signatures, Magnetic Storms, Statistical Analysis, Ats 6, Diurnal Variations, Magnetic Equator, Magnetic Field Configurations, Mathematical Models
Scientific paper
The signatures of magnetospheric substorms near 6.6 earth radii are statistically examined using data obtained on board ATS 6 by magnetic field and energetic particle measurements. It is confirmed that the configuration change toward a tail-like field in the dusk-to-midnight sector typically begins about one hour before the onset of the expansion phase of a substorm. Configuration changes before the onsets of moderate substorms are characterized by a directional change of magnetic field at magnetic latitude of approximately 10 deg, rather than by a change in the field magnitude. It is found during storm periods that the magnetic field orientation occasionally becomes almost parallel to the magnetic equator before expansion phase onsets. Here, the field magnitude usually increases above background levels. These facts are seen as strongly suggesting that a tail-like configuration is caused by an intensification and earthward motion of the cross-tail current system, often close to 6.6 earth radii, rather than by development of diamagnetic ring current.
Kokubun Susumu
McPherron Robert L.
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