Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp31a12b&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP31A-12
Physics
7522 Helioseismology
Scientific paper
Helioseismology seeks to infer the properties of the solar interior from global oscillation mode parameters (frequency, power, line width). Qualitative differences, such as substantial frequency shifts, have been observed in data obtained simultaneously in Doppler velocity (V) and total intensity (I). Clearly, the physics of the oscillation determining the mode parameters cannot depend on the quantity we observe from the Earth. These differences are thus probably related to the damping and excitation processes of the oscillation modes, which are not completely understood. A comparison of intensity and velocity data is explored both in GONG and MDI data. We first derive the relative phase and coherence between V and I, with the ultimate goals of obtaining the central frequency of the real solar oscillation modes simultaneously from V and I data, and testing models of the damping and excitation processes.
Barban Caroline
Hill F. F.
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