Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002an....323..317s&link_type=abstract
Astronomische Nachrichten, vol. 323, no. 3/4, p. 317-320
Other
5
Sun: Spots, Sun: Oscillations, Sun: Magnetic Fields
Scientific paper
For 3 decades it is known that sunspots show oscillations of velocity and intensity, that is of thermodynamic quantities. Oscillatory power is concentrated at periods around 2 \ldots 3 min, 5 min, and ga 20 min. Attempts to measure related magnetic field oscillations were contradictory. Now there are hints of significant magnetic signals in 2-D spectro-polarimetric data with power mainly in pores and at the boundary between the umbra and the penumbra of larger spots. We discuss these data and possibilities of their interpretation which are still a matter of debate. The magnetic oscillations could be the signature of a `whispering gallery' like mode of slow body waves in a thick magnetic flux-tube. However, other interpretations such as opacity oscillations or a crosstalk from velocity or compressive waves cannot be ruled out as long as better observed data, measurements of phase shifts in particular, and more realistic models are still missing.
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