Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...494..263m&link_type=abstract
Astronomy and Astrophysics, Volume 494, Issue 1, 2009, pp.263-268
Astronomy and Astrophysics
Astrophysics
3
Sun: Coronal Mass Ejections (Cmes), Sun: Flares
Scientific paper
Aims: Here, we study the relationship between flares and CMEs. Methods: For this purpose a statistical analysis of 578 flare-associated CMEs is presented. We considered two types of flare-associated CMEs: CMEs that follow and precede flare onset. Results: We shown that both samples have quite different characteristics. The first type of CMEs tends to be decelerated (median acceleration = -5.0 m s-2), faster (median velocity = 519 km s-1), and physically related to flares (a correlation coefficient between the energy of the CME and the peak of the X-ray flare = 0.80). The CMEs preceding associated flares are mostly accelerated (median acceleration = 5.4 m s-2), slightly slower (median velocity = 487 km s-1), and poorly related to flares (a correlation coefficient between the energy of the CME and the peak of the X-ray flare = 0.12). Conclusions: These two types of flare-associated CMEs demonstrate that magnetic reconnection, which influences the CME acceleration, could be significantly different in the two types of events.
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