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Astron. Astrophys. 339, L53-L56 (1998)

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Letter to the Editor

Upwelling in a young sunspot

M. Sigwarth , W. Schmidt and M. Schüssler

1 Kiepenheuer-Institut für Sonnenphysik, Schöneckstrasse 6, D-79104 Freiburg, Germany (e-mail: msig@kis.uni-freiburg.de; wolfgang@kis.uni-freiburg.de; msch@kis.uni-freiburg.de)

Received 23 September 1998 / Accepted 5 October 1998

Abstract

An upflow of with a velocity exceeding 0.5 km[FORMULA]s-1 is found in the umbra of the preceding spot in a young active region with ongoing flux emergence. A weak downflow is indicated in the corresponding spot of follower polarity. Such a flow pattern is consistent with the counter-rotation flow along a rising magnetic flux loop driven by the Coriolis force as predicted by numerical simulations.

Key words: sunspots – Sun: magnetic fields – Sun: photosphere – Sun: activity

Send offprint requests to: M. Sigwarth

This article contains no SIMBAD objects.

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© European Southern Observatory (ESO) 1998

Online publication: October 22, 1998
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