Computer Science – Sound
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1815o&link_type=abstract
American Astronomical Society, SPD meeting #42, #18.15; Bulletin of the American Astronomical Society, Vol. 43, 2011
Computer Science
Sound
Scientific paper
Recent Hinode/EIS observations indicated that slow magnetosonic waves are present in active region loops. Some of the spectral data were also interpreted as evidence of quasi-periodic flows. We perform three dimensional MHD model of an active region with waves and flows in coronal loops. The model is initiated with a dipole magnetic field and gravitationally stratified density, and velocity pulses are driven periodically in localized regions at the footpoints of magnetic loops. The resulting flows produce higher density loops compared to the surrounding plasma by injecting material along the field. We find that the excitation of periodic flows with subsonic speeds result in the excitation of slow magnetosonic waves that propagate along the loops. The phase speed of the waves is 100 km/s, close to coronal sound speed. When the amplitude of the driving pulses is increased we find that slow shock trains are produced. Using the results of the 3D MHD model we suggest that the observed slow magnetosonic waves and quasi periodic-flows are driven by the same quasi-periodic impulsive events at the bases of active regions.
Davila Jose Manuel
Ofman Leon
Wang Tower
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