Astron. Astrophys. 357, 1093-1104 (2000)

Acknowledgements

The authors are indebted to the NSO/SP-DST staff for the generous telescope time allocation and the unvaluable help during the observations. The authors express their thanks to the MDI team (P.I. P.H. Scherrer) for the efficient support during the observing run and their dedication in operating this instrument. MDI is part of SOHO, the Solar and Heliospheric Observatory, mission of international cooperation between ESA and NASA. We woud like to thank Thomas Straus for his comments during the preparation of this paper and for fruitful discussion on the phase difference problem.

© European Southern Observatory (ESO) 2000

Online publication: June 5, 2000
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