Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...485..869p&link_type=abstract
Astrophysical Journal v.485, p.869
Astronomy and Astrophysics
Astronomy
28
Convection, Methods: Numerical, Sun: Oscillations
Scientific paper
A new method of fitting tridimensional power spectra of solar oscillations is described and compared with a previous one whose use has been more common. The new method fits the parameters of the Lorentzian profiles in a bidimensional k - omega diagram constructed from an azimuthal average of the tridimensional one. The horizontal velocities are then determined keeping these parameters fixed, greatly reducing the computation time. Both methods are compared for two radial orders (n = 3, 4) of a tridimensional power spectrum obtained for a region of about 15 deg square around solar disk center. The images used in this work correspond to a 3 day set of 1080 x 1080 pixel intensity images obtained at the Observatorio del Teide on 1994 November 8--10 with the Taiwanese Oscillation Network (TON) instrument. The results of the fitted velocities agree within the estimated errors for the two methods. The reduction of the computing time obtained with the new method makes it convenient for the ring diagram analysis.
Ai Guoxiang
Bala B.
Chou Dean-Yi
Chou Yung-Ping
Ehgamberdiev Sh.
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