Physics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ncimc..17..313m&link_type=abstract
Nuovo Cimento C, Vol. 17, N. 3, p. 313 - 321
Physics
Aurorae: Interplanetary Magnetic Field
Scientific paper
On October 6, 1979, the low-altitude polar-orbiting satellites DMSP-F2 and -F4 crossed the auroral electron precipitation region in the opposite hemispheres at nearly the same universal time and in the same magnetic local-time sector near midnight. Three pairs of such nearly simultaneous conjugate crossings took place during a period of enhanced magnetic activity and strongly turning northward or southward of the interplanetary magnetic field (IMF). These conjugate observations allowed the study, with time resolution better than six minutes, of the variation, in response to directional changes of the interplanetary magnetic field, of the latitudinal position and width of the auroral regions. During the equatorward expansion of the whole auroral electron precipitation region, its latitudinal width is observed to decrease markedly when the IMF turns from a northern to a southern direction. These findings could be explained in terms of changes of the total open magnetic flux.
Candidi Maurizio
Mastrantonio F.
Mastrantonio G.
Meng Ching I.
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