A Comparison of GONG Intensity and Velocity Helioseismic Data

Details A Comparison of GONG Intensity and Velocity Helioseismic Data A Comparison of GONG Intensity and Velocity Helioseismic Data

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sf2a.conf..197b&link_type=abstract

Abstracts from SF2A-2001: Semaine de l'Astrophysique Francaise, meeting held in Lyon, France, May 28-June 1st, 2001, Eds.: F. Co

Astronomy and Astrophysics

Astrophysics

Scientific paper

Helioseismology seeks to infer the properties of the solar interior from global oscillation modes parameters (frequency,power,line width). Qualitive difference have been observed in spectra obtained simultane- ously in Doppler velocity (V) and total intensity (I). These differen- ces are probably related to the damping and excitation processes of the oscillation modes which are not completely understood. A comparison of V and I data is explored both in GONG and MDI data. The first goal is to obtain the central frequency of the real solar oscillation modes simultaneously from I and V data. An additional objective is to test models of the damping and excitation processes.

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