Oscillations and running waves observed in sunspots. II. Photospheric waves

To continue our study of waves related to sunspots in the photosphere, we analyzed CCD, high resolution sunspot observations obtained in the Fe i 557.6 nm line. We produced ``time slice images" which reveal inward slow propagating waves in the photospheric penumbra and outward propagating waves...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2000, Vol.363, p.306-310
Main Authors: Georgakilas, A. A., Christopoulou, E. B., Koutchmy, S.
Format: Article
Language:English
Subjects:
Sciences of the Universe
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Summary:To continue our study of waves related to sunspots in the photosphere, we analyzed CCD, high resolution sunspot observations obtained in the Fe i 557.6 nm line. We produced ``time slice images" which reveal inward slow propagating waves in the photospheric penumbra and outward propagating waves in the area around the sunspot. The phase velocity of the waves is near 0.5 km s-1 in both cases and their horizontal wavelength about 2500 km. The waves could be related either to solar p-modes or to the subphotospheric layer large-scale convection. Based on observations performed on the NSO/SPO Dunn's Solar Telescope (DST).
ISSN:0004-6361
1432-0756