A Statistical Study for Two Classes of CMEs

Details A Statistical Study for Two Classes of CMEs A Statistical Study for Two Classes of CMEs

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh12b0747m&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH12B-0747

Physics

7513 Coronal Mass Ejections, 7519 Flares, 7531 Prominence Eruptions

Scientific paper

MacQueen and Fisher (1983) noted the existence of two classes of CMEs; flare-associated CMEs show the highest speeds with little acceleration, wheras eruption-associated ones exhibit large accelerations. A statistical study has been performed to examine the bimodality of CMEs using the CME catalogue based on SOHO/LASCO observations from 1996 to 2000 by Yashiro and Michalek (2001). In the catalogue, we have used the speed and acceleration data obtained from height-time plots with 2nd order fits. We present the histogram of CME speed, the histogram of CME acceleration, and their speed-acceleration diagram. We have also conducted the same analysis for two different sets of data which have both time and spatial association with GOES solar flares and filaments activities (e.g., disappearing filaments), respectively. The filament data were collected from the NGDC and Big Bear Solar Observatory. Major results from this study are as follows. (1) The speed histogram for all the CMEs has a major peaks near 300km/s but does not show any double peaks. (2) Their acceleration histogram has a strong peak near zero, even for the two data sets associated with solar flares and filaments. (3) The number of CMEs with deceleration is comparable to that of CMEs with acceleration. (4) Their acceleration distribution has a maximum near zero regardless of their speed. (5) The ratio of flare-associated ones to all the CMEs increases with CME speed, wheras the ratio of filament-associated ones decreases. Finally we compare our results with previous ones and discuss their implications on the bimodality of CMEs.

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