Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh33b0413m&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH33B-0413
Physics
7509 Corona, 7524 Magnetic Fields, 7827 Kinetic And Mhd Theory, 7836 Mhd Waves And Instabilities (2149, 2752, 6050)
Scientific paper
We present the numerical results of a fast magnetoacoustic wave propagating within an idealized active region. The active region is modeled by an initially force-free, dipole magnetic configuration with gravitationally stratified density and contains a loop with a higher density than its surroundings. This study represents an extension to the model of Ofman &Thompson (2002). As found in their work, we see that fast wave propagation is distorted by the Alfvén speed profile and that the wave propagation generates fieldline oscillations and these oscillations are rapidly damped. Inside the high density loop, we find that the amplitude of these oscillations decreases as the density contrast, ξ, increases. We also find that the high density loop undergoes both vertical and horizontal oscillations. We calculate how the rate of wave damping in our loop varies with ξ and find a local minimum at about ξ=2.5, and we argue that this is evidence of wave trapping. Thus, this work illustrates the importance of obtaining accurate loop density measurements for coronal seismology.
McLaughlin James A.
Ofman Leon
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