Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...576..485l&link_type=abstract
The Astrophysical Journal, Volume 576, Issue 1, pp. 485-492.
Astronomy and Astrophysics
Astronomy
10
Sun: Coronal Mass Ejections (Cmes), Sun: Flares, Sun: Magnetic Fields, Sun: Prominences
Scientific paper
It has been suggested that coronal mass ejections (CMEs) are triggered by the loss of equilibrium of a coronal magnetic field configuration containing a twisted flux rope. We propose that there are two types of CMEs: fast CMEs that are triggered by a catastrophic loss of equilibrium and slow CMEs that do not involve a true catastrophe, but nevertheless show rapid evolution of the system. As an extension of the 1991 work by Forbes and Isenberg, we investigated the evolution of a magnetic configuration taking into account deviations from ideal MHD. We find that the non ideal-MHD evolution makes it easier for the catastrophic loss of equilibrium to occur, and the catastrophic behavior of the system is no longer constrained by the radius of the flux rope. For ideal-MHD evolution, we find that noncatastrophic solutions can account for slow CMEs. We also discuss the conditions under which the ideal-MHD approximation holds.
Lin Juhn-Jong
van Ballegooijen Adriaan A.
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