Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh43a..06c&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH43A-06
Physics
7513 Coronal Mass Ejections (2101), 7519 Flares, 7531 Prominence Eruptions, 7954 Magnetic Storms (2788)
Scientific paper
The largest geomagnetic storms are characteristically associated with major solar flares. The great storm of 9 November 1991 (Dst = -375 nT) provides an exception to this rule of thumb. It is ranked tenth of the largest Dst storms from 1932-2002, surpassing in intensity such well known events as 14 July 1982 and 16 July 2000. The November 1991 storm can be traced to a large disappearing solar filament from the southeast quadrant late on 5 November. The filament was located outside of an active region and its disappearance was well observed in both H-alpha and soft X-rays. The associated long-duration 1-8 Angstrom event had a C5 peak. This solar-terrestrial event indicates that neither a large complex active region nor an intense solar flare is a requirement for even first rank geomagnetic storms, thus providing insight to the physics of such events while making their prediction more difficult.
Balasubramaniam K.
Cliver Edward W.
Li Xiaoliang
Nitta Nariaki
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