A first study of the excitation and damping rate variations extracted from IRIS++ observations
Abstract
The IRIS++ network (International Research of the Interior of the Sun) have collected 11 years of low-l helioseismic data. Annual time series with an overlapping of 6 months are used to study the variations over the solar activity cycle of the different p-mode parameters. We find a global change of about -26% in the amplitudes, 14% in the linewidth and -12% in the velocity power while the rate at which the energy is supplied remains constant.
- Publication:
-
GONG+ 2002. Local and Global Helioseismology: the Present and Future
- Pub Date:
- February 2003
- Bibcode:
- 2003ESASP.517..377S
- Keywords:
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- Helioseismology;
- Solar Activity