The thermal structure of sunspots from ring diagram analysis
Basu, Sarbani; Baldner, Charles S.; Bogart, Richard S.
United States
Abstract
We present a large sample of 264 active regions from solar cycle 23, analysed using ring diagrams. The frequencies of these rings are inverted to determine the thermal structure (sound speed and adiabatic index) of these regions as a function of radius. The large sample allows us to describe in a statistically significant way how the thermal properties of the outer layers of the Sun change in the presence of magnetic fields.