Astron. Astrophys. 343, 983-989 (1999)

Acknowledgements

Financial support by the Deutsche Forschungsgemeinschaft through grants KN 152/17-1,2 and KN 152/19-1,2 and by the Graduiertenkolleg "Strömungsinstabilitäten und Turbulenz" is gratefully acknowledged. The Vacuum Tower Telescope at the Spanish Observatorio del Teide of the Instituto de Astrofísica de Canarias/Tenerife is operated by the Kiepenheuer-Institut für Sonnenphysik in Freiburg, Germany.

© European Southern Observatory (ESO) 1999

Online publication: March 1, 1999
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