Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...471..961m&link_type=abstract
Astronomy and Astrophysics, Volume 471, Issue 3, September I 2007, pp.961-965
Astronomy and Astrophysics
Astrophysics
11
Sun: Atmosphere, Sun: Oscillations, Sun Magnetic Fields
Scientific paper
Aims:We show that the spatial distribution (and its variation with frequency) of the power spectra of the velocity and intensity signals, in and around solar active regions, is a manifestation of the interaction of acoustic waves at the magnetic canopy. Methods: We analysed 6 h of simultaneous, full-disk, velocity and intensity images obtained using the MOTH instrument tuned in the Na D2 line at 589 nm and K D1 line at 770 nm, and full-disk velocity images from the SOHO/MDI experiment using the Ni line at 677 nm. Results: We propose that more than one type of magneto-acoustic-gravity wave is required to explain the well-known phenomena of p-mode absorption and power halos.
Armstrong James D.
Jefferies Stuart M.
McIntosh Scott W.
Moretti Pier Francesco
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