Studies of Wave-like Phenomena caused by the Catastrophe and the Consequences

Details Studies of Wave-like Phenomena caused by the Catastrophe and the Consequences Studies of Wave-like Phenomena caused by the Catastrophe and the Consequences

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....41.2214l&link_type=abstract

American Astronomical Society, SPD meeting #41, #22.14

Astronomy and Astrophysics

Astrophysics

Scientific paper

We investigated the evolutionary features of the magnetic configuration that includes a current-carrying flux rope, which is used to model the filament, after the loss of equilibrium in the system takes place in a catastrophic fashion. The flux rope is thrust upward rapidly and various types of disturbance around it and even on the boundary surface are consequently invoked. A slow mode shock is produced in front of the flux rope when its speed exceeds the local slow magnetoacoustic wave speed, and a fast mode shock appears as the speed exceeds the fast wave speed. Both shocks expand toward the flank, the fast one eventually reaches the boundary surface and its reflection forms two echoes from the footpoints, but the slow mode shock decays somewhere in the lower corona and cannot approach to the boundary. The interaction of the fast shock with the boundary leads to disturbance of which the propagation accounts for the Moreton wave when obsvered in Hα. Our results also suggest that the disturbance in the corona caused by the slow shock and the velocity vortices might account for the EIT wave whose speed is about 40% that of the Moreton wave. Implication of these results to the observed correlation of the type II radio burst to the fast and the slow mode shocks has also been discussed.

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