3D MHD Model of Waves in an Active Region

Details 3D MHD Model of Waves in an Active Region 3D MHD Model of Waves in an Active Region

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh33b0416o&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH33B-0416

Other

7509 Corona, 7524 Magnetic Fields, 7836 Mhd Waves And Instabilities (2149, 2752, 6050)

Scientific paper

Wave activity associated with flares and CME's have been observed with SOHO, TRACE, and other satellites. The propagation and dissipation of the waves provide information on the coronal magnetic structures. In particular, MHD waves were observed in coronal active region AR8270 following a flare with TRACE on July 14, 1998. In this study, three dimensional MHD model of the active region field was constructed using National Solar Observatory (NSO) Kitt Peak magnetogram and potential extrapolation of the magnetic field, together with gravitationally stratified density as the initial state. The model was evolved to steady state, and a velocity pulse with amplitude of ~100 km/sec was launched into the active region from below to mimic the observed effect of the flare. It was found that the global oscillations in the model active region are in good qualitative agreement with observations. The main difference between the observations and the model is in the oscillation of several individual loops that damp on longer time scale, compared to the corresponding magnetic field line oscillation damping in the model. We investigate the effects of global active region magnetic structure, as well as local loop structure on the trapping and damping of waves in the active region.

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