Multi-mode oscillations of sunspots

Details Multi-mode oscillations of sunspots Multi-mode oscillations of sunspots

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...355..347z&link_type=abstract

Astronomy and Astrophysics, v.355, p.347-354 (2000)

Astronomy and Astrophysics

Astrophysics

15

Sun: Atmosphere, Sun: Magnetic Fields, Sun: Oscillations, Sun: Sunspots

Scientific paper

Oscillations of the magnetic field in the sunspot photosphere have been detected by recent high-resolution, two-dimensional observations. Their power is concentrated in isolated small flux bundles (pores) outside of larger umbrae and at the boundary between umbra and penumbra of larger spots. The slow body mode provides an explanation of the appearance of magnetic oscillations in small sunspots if the azimuth number m=0, but also of the small features piling up in rings in large sunspots. In the latter model the magnetic oscillations are the signature of the slow body mode with m>> 1, which bears a resemblance to the well-known whispering gallery mode in acoustics. The slow surface modes and fast body modes are also discussed.

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