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

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 kms^-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.

Contents

• 1. Introduction
• 2. Observations and data analysis
• 3. Results
• 4. Discussion
• 5. Conclusion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1998

Online publication: October 22, 1998
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