Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.2104o&link_type=abstract
American Astronomical Society, SPD meeting #42, #21.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Recently, quasi-periodic, propagating waves have been observed in EUV by the SDO/AIA instrument in about 10 flare/CME events thus far. A typical example is the waves associated with the 2010 August 1 C3.2 flare/CME that exhibited arc-shaped wave trains propagating in an active region magnetic funnel with 5% intensity variations at speeds in the range of 1000-2000 km/s. The fast temporal cadence and high sensitivity of AIA enabled the detection of these waves. We identify them as fast magnetosonic waves driven quasi-periodically at the base of the flaring region, and develop a three-dimensional MHD model of the event. For the initial state we utilize the dipole magnetic field to model the active region, and include gravitationally stratified density at coronal temperature. At the coronal base of the active region we excite the fast magnetosonic wave by periodic velocity pulsations in the photospheric plane confined to the funnel of magnetic field line. The excited fast magnetosonic waves have similar amplitude, wavelength and propagation speeds as the observed wave trains. Based on the simulation results, we discuss the possible excitation mechanism of the waves, their dynamical properties, and the use of the event for coronal MHD seismology.
Aschwanden Markus
Liu Wende
Ofman Leon
Title Alan
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