HR: 16:00h
AN: SP24A-03    [Abstracts]
TI: Comparison of Mode Parameters Between Velocity and Intensity Acoustic Spectra via Ring Diagrams
AU: * Tripathy, S C
EM: sushant@nso.edu
AF: National Solar Observatory, 950 N Cherry Avenue, Tucson, AZ 85719 United States
AU: Hill, F
EM: fhill@nso.edu
AF: National Solar Observatory, 950 N Cherry Avenue, Tucson, AZ 85719 United States
AU: González Hernández, I
EM: irenegh@nso.edu
AF: National Solar Observatory, 950 N Cherry Avenue, Tucson, AZ 85719 United States
AU: Howe, R
EM: rhowe@nso.edu
AF: National Solar Observatory, 950 N Cherry Avenue, Tucson, AZ 85719 United States
AU: Komm, R W
EM: rkomm@nso.edu
AF: National Solar Observatory, 950 N Cherry Avenue, Tucson, AZ 85719 United States
AU: Toner, C G
EM: ctoner@nso.edu
AF: National Solar Observatory, 950 N Cherry Avenue, Tucson, AZ 85719 United States
AB: 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.
DE: 7500 SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY
DE: 7522 Helioseismology
SC: Solar Physics Division - AAS [SP]
MN: 2005 Joint Assembly