Changes in solar oscillation frequencies during the current activity maximum: analysis and interpretation

Details Changes in solar oscillation frequencies during the current activity maximum: analysis and interpretation Changes in solar oscillation frequencies during the current activity maximum: analysis and interpretation

2001-09-20

arxiv.org/abs/astro-ph/0109344v1

Astronomy and Astrophysics

Astrophysics

IAU Colloquium 185 "Radial and Nonradial Pulsations as Probes of Stellar Physics"

Scientific paper

We describe systematic changes in the centroid frequencies and the splitting coefficients as found using data from MDI on board SOHO, covering cycle 23. The data allow us to construct a seismic map of the evolving solar activity -- covering all latitudes. At lower latitudes, the temporal evolution closely tracks that of {\it butterfly diagram}. The additional information from higher latitudes in the map is of a significant activity in the polar region, peaking at activity minimum in 1996. The most plausible source of solar oscillation frequency changes over the solar cycle is the evolution of the radial component of the small-scale magnetic field. The amplitude of the required mean field changes is about 100 G at the photosphere, and increasing going inward.

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