Other
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.1549c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Feb. 1, 1986, p. 1549-1556.
Other
24
Auroras, Interplanetary Magnetic Fields, Ionospheric Currents, Latitude, Magnetospheric Instability, Polar Cusps, Magnetic Variations
Scientific paper
The connection between the interplanetary magnetic field (IMF) Bz, AE index, and magnetospheric cusp location is examined qualitatively. Seven months during 1979-1980 were searched for periods of low auroral activity and/or periods when the IMF Bz component and the AE index varied inconsistently (i.e., southward Bz and quiescent AE). During quiet auroral conditions, the IMF Bz, AE index, and equatorward cusp boundary generally tend to act coherently, although during very quiet times the cusp may exhibit considerable variability that is apparently unassociated with either Bz or AE. The effects of Bz and AE variations on the cusp are quite complicated and the observations simply do not indicate clear cusp response to one or the other. The largest equatorward cusp motions seem to occur as a result of prolonged southward Bz lasting 3 hours or more, and cusp latitude appears to depend strongly on time-accumulated Bz.
Carbary James F.
Meng Ching I.
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