Abstract
It has been shown from ground-based and space observations that the lower corona of the Sun contains a significant amount of cool chromospheric material in highly inhomogeneous structures, such as spicules, dark mottles, and fibrils. Therefore, some interactions between the cool and the hot material have been found in optical and ultraviolet observations. One of such phenomena is the weakening of solar EUV line emission originating from the chromosphere-corona transition region (Hi weakening) in the cool chromospheric material above the EUV emitting region, as suggested by Kanno (1979) and Schmahl and Orrall (1979). The remarkable nature of the weakening is that it is found even at the disc center of the quiet Sun.
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© 1986 D. Reidel Publishing Company
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Nishikawa, T. (1986). Continuum Absorption in the Solar EUV Spectra. In: Kitamura, M., Budding, E. (eds) Third Asian-Pacific Regional Meeting of the International Astronomical Union. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4630-9_4
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DOI: https://doi.org/10.1007/978-94-009-4630-9_4
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