Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.2401z&link_type=abstract
American Astronomical Society, SPD meeting #37, #24.01; Bulletin of the American Astronomical Society, Vol. 38, p.250
Astronomy and Astrophysics
Astronomy
Scientific paper
We report the results of a statistical study of the accelerations of coronal mass ejections (CMEs). CME usually undergoes a multi-phased kinematic evolution, with a main acceleration phase characterized by a rapid increase of CME velocity in the inner corona, followed by a relatively smooth propagation phase characterized by a constant speed or a small residual acceleration in the outer corona. We study both the main acceleration and the residual acceleration for a number of 50 CME events. These events are continuously tracked from the inner to the outer corona by all three coronagraphs of the LASCO: C1 (1.1 to 3.0 Rs), C2 (2 to 6 Rs) and C3 (4 to 30 Rs). We find that the magnitude of the main acceleration ranges from 2.8 to 4464.0 m/s/s with a median (average) value of 170.1 (330.9 m/s/s), whereas the magnitude of the residual acceleration ranges only from -131.0 to 52.0 m/s/s with a median (average) value of 3.1 (0.9 m/s/s). The distribution of the duration of the main acceleration is from 6 min to 1200 min, with a median (average) value of 54 (180 min). The main acceleration has a wide distribution over almost three orders of magnitude in terms of both magnitude and duration, representing a continuous spectrum of events from extremely gradual ones to extremely impulsive ones. We find an intriguing scaling law between the acceleration magnitude (A) and the acceleration duration (T) over the entire parameter range, that is A (m/s/s) = 10000 / T (min); this relation shows a strong inverse linear correlation in logarithmic scale between the two parameters with a correlation coefficient of 0.95. We acknowledge the support from NASA SECGI and NSF SHINE programs.
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