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Magnetically non split lines in penumbrae

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Abstract

Line asymmetries of five magnetically insensitive lines in penumbrae are investigated in detail.

It is shown that the high Evershed velocities as derived from line satellites originate in dark penumbral regions (DR), the main line components showing small velocities originate in bright penumbral regions (BR).

From the depressions of the main line component and the satellite the intensity of the DR is estimated to be 3.5 times higher than that of umbrae. The area of the BR exceeds that of the DR by a factor of about 1.8.

An interpretation of the discrepancy between velocity- and magnetic neutral lines is given.

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Authors and Affiliations

  1. Institut d' Astrophysique, Paris, France

    G. Stellmacher

  2. Universitäts-Sternwarte, Göttingen, Germany

    E. Wiehr

Authors
  1. G. Stellmacher
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  2. E. Wiehr
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Stellmacher, G., Wiehr, E. Magnetically non split lines in penumbrae. Sol Phys 17, 21–30 (1971). https://doi.org/10.1007/BF00152858

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  • DOI: https://doi.org/10.1007/BF00152858

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