Characterization of solar-cycle induced frequency shift of medium- and high-degree acoustic modes

Details Characterization of solar-cycle induced frequency shift of medium- and high-degree acoustic modes Characterization of solar-cycle induced frequency shift of medium- and high-degree acoustic modes

2011-03-05

arxiv.org/abs/1103.1079v1

J. Phys.: Conf. Ser. 271, 012026 (2011)

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Proceedings of GONG-SoHO 24: A new era of seismology of the sun and solar-like stars

Scientific paper

Although it is well known that the solar acoustic mode frequency increases as the solar activity increases, the mechanism behind it is still unknown. Mode frequencies with 20 < l < 900 obtained by applying spherical harmonic decomposition to MDI full-disk observations were used. First, the dependence of solar acoustic mode frequency with solar activity was examined and evidence of a quadratic relation was found indicating a saturation effect at high solar activity. Then, the frequency dependence of frequency differences between the activity minimum and maximum was analyzed. The frequency shift scaled by the normalized mode inertia follows a simple power law where the exponent for the p modes decreases by 37% for modes with frequency larger than 2.5 mHz.

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