Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...435..881d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 435, no. 2, p. 881-887
Astronomy and Astrophysics
Astrophysics
9
Acoustic Properties, Flux Density, Solar Oscillations, Solar Wind Velocity, Sunspots, Mathematical Models, Statistical Distributions
Scientific paper
Sunspots are known to behave as efficient sinks of acoustic wave energy, absorbing almost 50% of the energy from the acoustic waves impinging on them. The physical properties of the flux tube that forms the sunspot are believed to be responsible for the absorption. We show that the absorption coefficient is closely connected not only to the physical properties of the sunspot flux tube, but also to its geometry beneath the surface. Using geometric acoustics, we show that a sunspot with a monolithic fluxtube structure mixes acoustic modes; energy in an incoming mode, at any horizontal wavenumber kh, gets dispersed into a wide range of wavenumbers. We also predict the observational signatures of mode mixing in sunspots.
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