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Issue A&A
Volume 373, Number 1, July I 2001
Page(s) L1 - L4
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20010578



A&A 373, L1-L4 (2001)
DOI: 10.1051/0004-6361:20010578

Plumes and oscillations in the sunspot transition region

P. Maltby1, N. Brynildsen1, O. Kjeldseth-Moe1 and K. Wilhelm2

1  Institute of Theoretical Astrophysics, University of Oslo, PO Box 1029 Blindern, 0315 Oslo, Norway
    e-mail: nils.brynildsen@astro.uio.no; olav.kjeldseth-moe@astro.uio.no
2  Max-Planck-Institut für Aeronomie, 37191 Katlenburg-Lindau, Germany
    e-mail: wilhelm@linmpi.mpg.de

(Received 23 February 2001 / Accepted 23 April 2001)

Abstract
The suggestion that sunspot transition region oscillations are a typical feature of the sunspot plumes is examined. The present observations show 3 min oscillations in the umbra that end at the umbral rim. We find that sunspot plumes located above the umbra show these oscillations, in contrast to plumes above the penumbra. These two findings suggest that the oscillations may be a property of the umbral transition region.


Key words: Sun: oscillations -- Sun: transition region -- EUV radiation -- sunspots

Offprint request: P. Maltby, per.maltby@astro.uio.no




© ESO 2001


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