Physics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.2447g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, March 1, 1987, p. 2447-2460.
Physics
30
Auroral Arcs, Dmsp Satellites, Magnetic Signatures, Magnetic Storms, Polar Substorms, Earth Ionosphere, Magnetic Disturbances, Magnetic Fields, Midlatitude Atmosphere
Scientific paper
The relationship between midlatitude and synchronous orbit magnetic signatures and the location of the auroral surge at the onset of three isolated magnetospheric substorms is explored. It is found that the surge forms with its western edge about one hour west of the longitude where the major axis of the midlatitude Pi 2 polarization ellipse is along magnetic north and where the D component perturbation of the magnetic bay is near zero. These observations are in qualitative agreement with a current wedge consisting of a localized upward current in the west and a longitudinally distributed current in the east. At synchronous orbit the longitude of the surge heat appears to separate a region to the west where the magnetic field becomes more taillike from one to the east where the magnetic field becomes more dipolar.
Gelpi C.
Hughes Jeffrey W.
Singer Howard J.
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