Low-degree p-mode parameters: the solar-cycle dependence

Details Low-degree p-mode parameters: the solar-cycle dependence Low-degree p-mode parameters: the solar-cycle dependence

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464..123t&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,

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7

Solar Cycle, P-Modes

Scientific paper

Using the LOI-proxy data of the MDI instrument we have studied the solar-cycle dependence of the low-degree (l=0-3) p modes between May 1996 and August 2000. In addition to the usual frequency shift we have also found that mode linewidths increase by about 15% from the solar minimum to the solar maximum. Within the accuracy we have, the other parameters: rotational splitting and asymmetry do not exhibit any dependence with the solar cycle, except the a2 coefficient which seems to increase as well with activity. Thought the mode energy does not also vary much, this analysis indicates an unexplained maximum of energy in the first half of year 1998.

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