Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.5802z&link_type=abstract
American Astronomical Society Meeting 210, #58.02; Bulletin of the American Astronomical Society, Vol. 39, p.167
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a statistical study on the distribution of CME kinematic properties, including speed and acceleration with an emphasis on CME’s dynamic evolution process in the inner corona. From 1996 to 2005, the Large Angle and Spectroscopic Coronagraph (LASCO) on SOHO spacecraft has observed about 10400 CMEs. The speed of these CMEs has a wide distribution from 20 km/s to 3400 km/s. What is the cause of this broad diversity of CME speed? We look into the CME acceleration magnitude and acceleration duration; the combination of these two factors determines the final speed of a CME. The direct observations of CME acceleration in the inner corona have been made for only several dozen events when LASCO C1 coronagraph was operational from 1996 to 1998. In order to extend this study to a much larger number of events, we make use of flares associated with CMEs. In particular, the rise time of soft X-ray flares can be effectively used as a proxy of CME acceleration time. We will present the distribution of CME acceleration magnitude and duration, including average, median and maximum value. The relations between CME kinematic properties, which is a result of magnetic re-structuring in the large scale, and flare flux properties, which is a result of particle acceleration and heating in the micro scale, are discussed.
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