Other
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007acasn..48..181x&link_type=abstract
Acta Astronomica Sinica, vol. 48, no. 2, p. 181-189
Other
1
Physical Data And Processes: Magnetohydrodynamics, Sun: Coronal Mass Ejections, Sun: Filaments, Sun: Magnetic Fields
Scientific paper
Observations indicated that solar coronal mass ejections (CMEs) are strongly associated with reconnection-favored flux emergence. As suggested by observations, two types of emerging flux with reconnection-favored direction can trigger filament eruptions (and then CMEs): one is within the filament channel, and the other is on the outer edge of the channel. Based on numerical simulations, a physical model of the emerging flux trigger mechanism for CMEs is proposed, which explained well the observational phenomena. Using 2.5 dimensional numerical simulations with the gravity and heat conduction being omitted, the eruption and non-eruption regimes are presented in parameter space, which indicate that whether a CME can be triggered depends on both the amount and the location of an emerging flux, besides its polarity orientation. Furthermore, by analyzing15 eruption events in 2002 and 2003 and 44 non-eruption events in 2002, the relation between filament eruptions (and CMEs) and the properties of emerging flux including its polarity orientation, its location, and the amount of the unsigned flux is studied statistically. The results show that not all the emerging flux can make a filament lose equilibrium and then trigger the onset of a CME. The statistic results basically support the theoretical numerical simulations, in which the 2.5 dimensional time dependent compressible resistive MHD equations are numerically solved with a multi-step implicit scheme. This research provides useful information for the space weather forecast.
Chen Peng-Fei
Fang Chen
Xu Xiao-Ye
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