Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2906r&link_type=abstract
American Astronomical Society Meeting 210, #29.06; Bulletin of the American Astronomical Society, Vol. 39, p.138
Astronomy and Astrophysics
Astronomy
Scientific paper
Coronal dimmings represent plasma which has been removed from the corona by a CME ejection. We report on a statistical analysis of 99 CME-associated EUV coronal dimmings between 1998 and 2000. We investigate the size and location of the events and characterize how these events evolve with time. The durations typically range from 4 to 12 hours, though the longest events extend to nearly 24 hours. The dimmings appear most frequently within the belt of active regions (20-50 degrees latitude). Dimming events are generally symmetric in latitude and longitude with some tendency to be broader in latitude. The temporal profiles of most events are characterized by a sharp rise and a gradual recovery. The dimming area and intensity evolve on different timescales, with events often reaching their maximum extent in area and then continuing to deepen in intensity. Though the majority of cases are well fit by a single recovery slope, a large minority of events have a two part decay with an initial decaying slope that is similar in magnitude to the rising slope and a secondary, flatter, decay lasting several hours. These dimming properties will also be compared with associated CME properties. The results from this study are expected to provide insight into CME origins and may help improve predictions of CME-related parameters.
Biesecker Doug
Reinard Alysha
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