Temporal behaviour of radial p-modes

Details Temporal behaviour of radial p-modes Temporal behaviour of radial p-modes

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464...63l&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,

Physics

3

Solar Oscillations

Scientific paper

The amplitude modulation of solar radial p-modes has been studied in irradiance and radiance data from VIRGO and velocity data from MDI onboard SOHO. The amplitudes vary substantially with time. For two modes, l=0, n=21 and 22 we find a strong rotational modulation at the end of the old solar cycle (number 22). The modulation vanishes during solar minimum and only weakly reappears during the rise of the new cycle. There is a decrease in the integrated mode amplitudes with increased activity for the modes that show rotational modulation. At low solar activity there is little correlation between modes of varying order, but the correlation seems to increase with increasing solar activity.

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