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High-resolution photography of the solar chromosphere

XVI: Hα contrast profiles of active region loops

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Abstract

High-resolution filtergrams of an active region loop taken at seven wavelengths in Hα have been used to derive the contrast at eleven locations along its length as a function of wavelength. With an appropriate choice of parameters, theoretical curves calculated on the basis of the ‘cloud” model give a reasonable fit to the observed contrast profiles. The inferred line-of-sight components of the mass velocity range from 27 km s−1 upward to 78 km s−1 downward. However, more accurate profiles and a more rigorous theory are needed to confirm the validity of this application of the cloud model.

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Authors and Affiliations

  1. CSIRO Division of Applied Physics, 2070, Sydney, Australia

    R. J. Bray & R. E. Loughhead

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  1. R. J. Bray
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  2. R. E. Loughhead
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Bray, R.J., Loughhead, R.E. High-resolution photography of the solar chromosphere. Sol Phys 85, 131–140 (1983). https://doi.org/10.1007/BF00148264

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  • DOI: https://doi.org/10.1007/BF00148264

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