Comparison of Mode Parameters Between Velocity and Intensity Acoustic Spectra via Ring Diagrams

Details Comparison of Mode Parameters Between Velocity and Intensity Acoustic Spectra via Ring Diagrams Comparison of Mode Parameters Between Velocity and Intensity Acoustic Spectra via Ring Diagrams

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp24a..03t&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP24A-03

Astronomy and Astrophysics

Astrophysics

7500 Solar Physics, Astrophysics, And Astronomy, 7522 Helioseismology

Scientific paper

We analyse the local acoustic spectra at different locations over the solar disk using both velocity and intensity images from MDI. These spectra were fitted to obtain different mode parameters: e.g., acoustic frequencies, mode amplitudes and life time using symmetric fits. We find differences between frequencies derived from velocity and intensity filtergrams, and it appears that the mode frequencies vary as a function of location on the disk. Since the apparent frequency shift between an oscillation observed in velocity and intensity can not be a property of the mode, the analysis is expected to provide important information about the driving and damping of local acoustic oscillations.

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