Other
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464...33k&link_type=abstract
In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,
Other
4
Mode Damping, Mode Excitation, Oscillations, Solar Cycle
Scientific paper
We present measurements of mode width, mean-square velocity power, the energy per mode, and the energy supply rate, derived from all currently processed 108-day GONG time series and discuss their implications for p-mode excitation and damping. The mode width shows the familiar "plateau" between 2.5 and 3.1 mHz with a "dip" near 2.9 mHz. This dip is most prominent during solar-cycle minimum and disappears with increasing magnetic activity. The mode energy, which reaches a maximum value of about 2.2×1028 erg near 3.15 mHz, decreases with increasing activity. The decrease is frequency dependent and shows a maximum near 3 mHz with a change of about -13% from the previous activity minimum to the currently highest level of activity. The energy supply rate, reaching a maximum value of about 2.5×1023 erg s-1 near 3.6 mHz, decreases on average by about 3% and its solar-cycle variation shows no frequency dependenc which is in marked contrast to the other mode parameters. Therefore, the variation in the energy supply rate might be compatible with a zero change. We speculate that the excess of the supplied energy might be transferred to the increasing number of flux tubes and might, in this way, contribute to the irradiance variation.
Hill F. F.
Howe Rachel
Komm Rudi
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