MHD Waves in Magnetic Flux Concentrations

Details MHD Waves in Magnetic Flux Concentrations MHD Waves in Magnetic Flux Concentrations

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh42b0535b&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH42B-0535

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Computation

7507 Chromosphere, 7524 Magnetic Fields, 7529 Photosphere, 7827 Kinetic And Mhd Theory, 7843 Numerical Simulation Studies

Scientific paper

Results from 2D MHD simulations of waves in a stratified isothermal atmosphere will be presented and analyzed. The waves are generated by a localized piston source situated on the lower, photospheric, boundary of the computational domain. A combination of fast and slow magneto-atmospheric waves propagates with little mutual interaction until they encounter the surface where the sound speed and the Alfven speed are comparable in magnitude. The waves couple strongly in this region and emerge with different amplitudes and phases. Owing to this mode mixing and the large variation in the Alfven speed in the magneto-atmosphere, the fluctuations observed at a given location are often a superposition of both fast and slow waves which have traversed different paths and have undergone different transformations during their journies.

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