Abstract
Observations made during the 1991 total solar eclipse and recent observations from NSO/Sac Peak are discussed. The ground-based density measurements will be complimentary to SOHO observations, particularly SOHO electron density measurements.
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Flower, D.R., Pineau des Forêts, G.: 1973,A&A 24, 181
Penn, M.J., Arnaud, J., Mickey, D.L., LaBonte, B.J.: 1993,preprint
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Operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under cooperative agreement with the National Science Foundation