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| Paper: |
Evidence of the Correspondence of EIT Waves and Coronal Mass Ejections
Induced Waves Using a Three-Dimensional Magnetohydrodynamic Simulation |
| Volume: |
474, Numerical Modeling of Space Plasma Flows (ASTRONUM2012) |
| Page: |
185 |
| Authors: |
Wu, S. T.; Wu, C.-C.; Liou, K. |
| Abstract: |
Before the discovery of EIT waves and coronal mass ejections (CMEs) it was already known that Moreton waves
were observed to propagate across the solar disk during some solar flares. This magnetohydrodynamic wave was
explained as the intersecting line between the edge of an expanding global coronal wavefront and the chromosphere (Uchida, 1968)
where Uchida concluded that the Moreton wave was a fast mode MHD wave.
In this presentation, we will show that the EIT wave could be a part of a CME induced wave propagating across the solar disk.
To illustrate this scenario, we have employed a global 3D MHD model (Wu et al. 2001) to simulate this phenomenon for the May 12, 1997
event which was an Earth-directed CME observed by SOHO/EIT (Thompson et al. 1998). To carry out this simulation, the measured
global magnetic fields obtained from the Stanford University Wilcox Solar Observatory (WSO) were used as the inputs to the simulation model.
We were able to show that the scenario suggested by Uchida (1968), namely, the observed EIT wave propagating across the
solar disk could be caused by the intersection line between the edge of an expanding CME induced wave front and the chromosphere.
In addition to the flare source scenario, we concluded that an EIT (or EUV) wave can also be a part of a flare induced
coronal wave with its foot print on the Sun's surface. |
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