Physics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9712231t&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A8, Aug. 1, 1992, p. 12,231-12,243.
Physics
4
Auroral Zones, Field Aligned Currents, Interplanetary Magnetic Fields, Night, Current Sheets, Magsat Satellites
Scientific paper
A new By-controlled field-aligned current system which develops in the midnight sector is presented on the basis of the magnetic field data from southern passes of Magsat for which the IMF Bz component was positive and the By component was particularly stable. The current system, referred to as the midnight sector triple-sheet (MTS) field-aligned current system, appears in the premidnight sector (postmidnight sector) of the southern hemisphere when By is negative (positive). When By is negative (positive), the current system consists of the most equatorward and the most poleward sheets with currents flowing away from (into) the ionosphere and a sheet in between with currents flowing into (away from) the ionosphere. The MTS current system is defined in 70 passes among 100 passes for which IMF Bz was positive and By was stable. Magnitude of By and the magnetic local time are found to be the main controlling factors of the intensity of the MTS current system.
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