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Periodic variations of the Ba II 4554 Å and Ca II 8542 Å line profiles in coronal holes

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Abstract

The oscillations of the half-width of the Ba II 4554 Ǻ and Ca II 8542 Ǻ spectral lines have been analyzed using observations at the base of solar coronal holes (CHs). The observed variations (~50 m Ǻ for Ca II and ~4 m Ǻ for Ba II) exceed considerably the thermal broadenings of these lines calculated from the measured intensity oscillations, suggesting their nonthermal nature. We point out a number of observational facts that hamper an unambiguous interpretation of the periodic Ba II and Ca II profile variations solely by the manifestation of torsional Alfve´ n waves in the lower solar atmosphere.

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Authors and Affiliations

  1. Institute for Solar–Terrestrial Physics, Russian Academy of Sciences, Siberian Branch, P.O. Box 291, Irkutsk, 664033, Russia

    N. I. Kobanov, S. A. Chupin & D. Yu. Kolobov

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  1. N. I. Kobanov
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  2. S. A. Chupin
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  3. D. Yu. Kolobov
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Correspondence to N. I. Kobanov.

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Original Russian Text © N.I. Kobanov, S.A. Chupin, D.Yu. Kolobov, 2016, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2016, Vol. 42, No. 1, pp. 60–67.

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Kobanov, N.I., Chupin, S.A. & Kolobov, D.Y. Periodic variations of the Ba II 4554 Å and Ca II 8542 Å line profiles in coronal holes. Astron. Lett. 42, 55–62 (2016). https://doi.org/10.1134/S1063773716010047

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  • DOI: https://doi.org/10.1134/S1063773716010047

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