Physics
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104...95n&link_type=abstract
Journal of Geophysical Research, Volume 104, Issue A1, p. 95-104
Physics
11
Ionosphere: Ionospheric Disturbances
Scientific paper
During the much studied magnetic cloud encounter with Earth on January 10-11, 1997, pairs of polar cap arcs twice became widely separated from the auroral oval, that is, an extremely rare double θ aurora configuration arose. These events exhibit many dynamic features hitherto rarely if ever reported in the literature of θ aurora. The two independent bars proved capable of merging into a single bar, crossing the polar cap, then splitting again. Moreover, in both events, after completely crossing the polar cap, the transpolar arcs reversed direction, and crossed again. The dynamics of these double θ-aurora events appear to constain any models of their origin. Interestingly, in the January 10 event, a double θ-aurora which had twice crossed the polar cap ended up in a configuration previously termed a double oval. Particle data from the DMSP F13 satellite demonstrates that an isolated plasma sheet fragment formed also in the southern hemisphere, at least for the January 11 event for which correlative data is available.
Brittnacher Mitchell J.
Liou Kan
Meng Ching I.
Newell Patrick T.
Parks George
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