Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...576..561g&link_type=abstract
The Astrophysical Journal, Volume 576, Issue 1, pp. 561-566.
Astronomy and Astrophysics
Astronomy
10
Sun: Oscillations, Sun: Sunspots
Scientific paper
We analyze UV observations of an isolated sunspot taken with the Transition Region and Coronal Explorer. We produced ``space/time slice images,'' which reveal periodic, inward-propagating, intensity fluctuations in the inner photospheric penumbra and periodic, outward-propagating, annular intensity fluctuations in the outer penumbra and the area around the sunspot. The average propagation velocity of the inward- and outward-propagating intensity flows is about 0.5 and 1 km s-1, respectively, and the distance between subsequent crests is about 2500 km. Using observations obtained with the Michelson Doppler Imager, we found propagating magnetic field enhancements that present a spatial and temporal coherence with the UV intensity fluctuations. We have not observed any waves similar or related to the chromospheric 5 minute waves. Based on observations taken with the Transition Region and Coronal Explorer and the Michelson Doppler Imager (MDI) on board the Solar and Heliospheric Observatory.
Christopoulou E. B.
Georgakilas A. A.
Muglach Karin
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