Evidence for solar frequency dependence on sunspot type

Details Evidence for solar frequency dependence on sunspot type Evidence for solar frequency dependence on sunspot type

2011-04-19

arxiv.org/abs/1104.3867v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

13 pages, 4 figures, accepted in ApJ letters

Scientific paper

High degree solar mode frequencies as measured by ring diagrams are known to change in the presence of the strong magnetic fields found in active regions. We examine these changes in frequency for a large sample of active regions analyzed with data from the Michelson Doppler Imager (MDI) onboard the SoHO spacecraft, spanning most of solar cycle 23. We confirm that the frequencies increase with increasing magnetic field strength, and that this dependence is generally linear. We find that the dependence is slightly but significantly different for active regions with different sunspot types.

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