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Astron. Astrophys. 363, 279-288 (2000)

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This research is supported in part by a Grant from the US - INDIA Cooperative Science Program of the International Programs Division of the Smithsonian Institution. Three of us (K.R.S., S.S.G and S.S.H) acknowledge the support provided by the Department of Science and Technology, New Delhi, India and the encouragement provided by Prof. R. Cowsik, Director, Indian Institute of Astrophysics, Bangalore. We wish to express our sincere thanks to Keith Pierce who fabricated the spectroheliograph set up which helped us to acquire two dimemsional images with high spectral purity and to Harry Jones, Frank Recely and Teresa Bippert-Plymate who helped us with the magnetic area scans at the vacuum telescope simutaneous with the SHGs. We are thankful to Ms. Jeannette Barnes and Dave Bell of the NOAO who provided extensive help while reducing the data using the IRAF package, to Mark Hanna of the NOAO who helped us in making the prints of some of the figures and to Baba Vergheese of IIA, Bangalore who helped us with part of the reductions and plots and with the latex format. We are grateful to Jack Harvey, Douglas Rabin, Frank Hill and David Jaksha of the NSO for sparing time for many valuable discussions in the course of the analysis and the preparation of this paper. We are thankful to NSO for permitting us to reproduce sections of Bruce Gillespie's spectroheliogram in this paper.

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© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000