Physics
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.2723h&link_type=abstract
Journal of Geophysical Research, vol. 82, July 1, 1977, p. 2723-2734.
Physics
6
Auroras, Daytime, Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Storms, Polar Substorms, Auroral Arcs, Auroral Zones, Magnetic Equator, Time Constant
Scientific paper
Latitudinal shifts of the discrete dayside aurora are examined with respect to variations in the interplanetary magnetic field (IMF) and to magnetospheric substorms. Within 10-15 min after steplike southward (northward) transitions in the IMF the dayside auroral oval moves equatorward (poleward). In at least some cases the auroral shift is similar to an exponential relaxation in latitude from an initial to a final steady state value; for these cases the average exponential time constant is estimated to be 17 min. Substorm features in the dayside aurora include (1) an equatorward shift by 1-3 deg of the equatorward discrete auroral boundary, (2) a brightening of the discrete aurora near substorm onset, (3) the formation of multiple auroral bands, and (4) poleward motion of short-lived individual auroral arcs occurring nearly coincident in time with the equatorward boundary shifts, the average poleward velocity of these arcs being approximately 800 m/s.
Akasofu Syuh-Ichi
Horwitz James L.
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