HR: 1340h
AN: SH44A-1731 [Abstracts]
TI: The Evolution of the Electric-Field Distribution During the CME/Two-Ribbon-Flare Event
AU: * Yu, H
EM: hsyu@jupiter.ss.ncu.edu.tw
AF: National Central University, Institute of Space Science, National Central University, Chung-
Li, 320-01, Taiwan
AU: Lyu, L
EM: lyu@jupiter.ss.ncu.edu.tw
AF: National Central University, Institute of Space Science, National Central University, Chung-
Li, 320-01, Taiwan
AU: Wu, S
EM: wus@cspar.uah.edu
AF: University of Alabama in Huntsville, Center for Space Plasma and Aeronomic Research,
University of Alabama in Huntsville, Huntsville, AL 35899, United States
AB:
The two-ribbon-flare (TRF) associated electric field near the solar surface can be estimated from the observed
footpoint motion of the two-ribbon flares and the observed magnetic field on the solar surface. Based on the
steady reconnection model, the estimated electric field on the solar surface is equal to the electric field near the
reconnecting current sheet (RCS). The electric field near the RCS can be used to calculate the magnetic flux
change rate during the CME/TRF event. The electric field near the RCS is also responsible for the generation of
the relativistic particles and the acceleration of the coronal mass ejection (CME). Therefore, it is important to
know how to correctly estimate the electric field at the RCS during a CME/TRF event. In this investigation, we use
a two-dimensional magnetohydrodynamic simulation to study the evolution of the electric-field distribution during
the CME/TRF event. Our preliminary results indicate that the electric field is not always uniform during the
CME/TRF event. Particularly, the electric field above and below the reconnection site are usually different from
each other. Our results might provide an explanation to the poor correlation between the estimated electric field
on the solar surface and the acceleration of the CME in the previous observations (Jing et al., 2005).
DE: 7513 Coronal mass ejections (2101)
DE: 7519 Flares
DE: 7526 Magnetic reconnection (2723, 7835)
DE: 7835 Magnetic reconnection (2723, 7526)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting