Interaction of EIT Waves with Coronal Active Regions

Details Interaction of EIT Waves with Coronal Active Regions Interaction of EIT Waves with Coronal Active Regions

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh31d11o&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH31D-11

Physics

7509 Corona, 7524 Magnetic Fields, 7835 Magnetic Reconnection, 7843 Numerical Simulation Studies, 7851 Shock Waves

Scientific paper

We use 3D MHD modeling to investigate the interaction of the EIT waves with active regions. The active region is modeled by an initially force-free, bipolar, magnetic configuration. We include gravity, finite thermal pressure, and resistive dissipation in our model. The EIT wave is launched at the boundary of the region, as short time velocity pulse that travels with the local fast magnetosonic speed ( ~ 250 km/s) towards the active region. We investigate the effect of the pulse amplitude and direction relative to the active region magnetic field orientation. We find that the EIT wave reconnects with the active region magnetic field, and induces transient currents. The currents and the resulting Lorenz force lead to the dynamic distortion of the active region magnetic field, and the generation of secondary waves that propagate away from the active regions. The Lorenz force compresses the plasma and induces flow along the magnetic flux tubes producing active region loops. Analysis of the interaction between the EIT wave and the active region can serve as a diagnostic of the active region coronal magnetic structure. We show animations of the interaction of the EIT waves with the active regions.

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