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Spectral investigation of the chromosphere

VI: Observations of Hα close to the limb

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Abstract

Several hundred Hα spectrograms from areas close to the solar limb were taken with the 35 cm Coudé refractor at Anacapri. The 41 spectra with the greatest spatial resolution were selected and analysed. At the supergranular boundaries a considerable fraction of the line profiles were found to correspond to Beckers’ Cloud Model (BCM). Moreover, the BCM parameters of the dark mottles at the limb appear to be approximately equal to those from the center of the disk. On the other hand, we also obtained evidence in disagreement with the general applicability of the BCM to all features of the chromospheric fine structure.

We attempted to present the large set of observational data in a fashion that permits their interpretation by alternative theoretical models.

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Authors and Affiliations

  1. Fraunhofer Institut, Freiburg, F.R.G.

    U. Grossmann-Doerth & Marina Von Uexküll

Authors
  1. U. Grossmann-Doerth
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  2. Marina Von Uexküll
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Mitteilungen aus dem Fraunhofer Institut Nr. 151.

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Grossmann-Doerth, U., Von Uexküll, M. Spectral investigation of the chromosphere. Sol Phys 55, 321–333 (1977). https://doi.org/10.1007/BF00152576

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  • DOI: https://doi.org/10.1007/BF00152576

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