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The fine structure of prominences
Authors:Oddbjørn Engvold
Institution:(1) Sacramento Peak Observatory, Air Force Geophysics Laboratories (AFSC), 88349 Sunspot, N.M., U.S.A.
Abstract:High spatial resolution spectral observations of five hedgerow prominences were made in Hagr, He i D3 and Ca ii H and K.The observed relations between the lines were not the same in all prominences. The Ca ii H and K lines were 2–4 times brighter relative to Hagr and D3 than predicted theoretically. The optical thickness of Hagr was less than for the H and K lines, the Hagr was optically thin in medium faint prominence structures. Faint structures appeared slightly hotter than bright structures.On leave from Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029, Blindern, Oslo 3, Norway.
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