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Detailed Reference Information |
Newell, P.T., Liou, K., Meng, C., Brittnacher, M.J. and Parks, G. (1999). Dynamics of double-theta aurora: Polar UVI study of January 10–11, 1997. Journal of Geophysical Research 104: doi: 10.1029/1998JA900014. issn: 0148-0227. |
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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 &thgr; aurora configuration arose. These events exhibit many dynamic features hitherto rarely if ever reported in the literature of &thgr; 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 &thgr;-aurora events appear to constain any models of their origin. Interestingly, in the January 10 event, a double &thgr;-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. ¿ 1999 American Geophysical Union |
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Abstract |
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Keywords
Ionosphere, Ionospheric disturbances, Magnetospheric Physics, Polar cap phenomena, Space Plasma Physics, Waves and instabilities |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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