Amplitude modulation of low degree p-modes - comparison of BISON and VIRGO

Details Amplitude modulation of low degree p-modes - comparison of BISON and VIRGO Amplitude modulation of low degree p-modes - comparison of BISON and VIRGO

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.517..151a&link_type=abstract

In: Proceedings of SOHO 12 / GONG+ 2002. Local and global helioseismology: the present and future, 27 October - 1 November 2002,

Other

Solar Oscillations

Scientific paper

Using both VIRGO and MDI data we have previously studied the amplitude variation of the l=0 p-modes for radial orders 12 to 32. In this study we extend the investigation backward in time to 1992 by including data from the BISON network. For the large amplitude modes there is a strong correlation between the space based radiance measurements from VIRGO and the ground based Doppler shift measurements from BISON. The extreme rotational modulation of l=0, n=22 is confirmed to be a phenomenon confined to the period of minimum solar activity. Also with neighbouring l=1, n=21 a clear modulation is seen at slightly lower frequency. Some persistent frequencies occur in other l=0,1 modes, but not to the same level in time and amplitude.

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