SOHO CoRoT Kepler Picard SDO GONG
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Time-Distance Analysis of GONG Global Mode Time Series.

Auteur

Kholikov Shukirjon

Institution

National Solar Observatory/GONG Program

Theme

Low degree solar and stellar seismology
Auteur(s) supplémentaire(s)Irene Gonzalez Hernandez, Frank Hill, John Leibacher

Abstract

We apply the time-distance technique to the low degree (ell<=200) GONG spherical harmonic time series obtained during the last 14 years. We demonstrate the advantages of low-m filtering in isolating zonal acoustic waves. We analyze temporal variations of mean travel times and meridional travel time differences. Our preliminary results show that mean travel times track solar activity cycle as well as p-mode frequencies. We also present deep meridional travel-time difference maps, and discuss some systematic and technical problems.
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