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

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• 作者：N. I. Kobanov ; S. A. Chupin ; D. Yu. Kolobov
• 关键词：solar atmosphere ; coronal holes ; Alfvén waves
• 刊名：Astronomy Letters
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：42
• 期：1
• 页码：55-62
• 全文大小：1,221 KB
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• 作者单位：N. I. Kobanov (1)
  S. A. Chupin (1)
  D. Yu. Kolobov (1)
  
  1. Institute for Solar–Terrestrial Physics, Russian Academy of Sciences, Siberian Branch, P.O. Box 291, Irkutsk, 664033, Russia
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Astronomy
  Astrophysics
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1562-6873

文摘

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. Keywords solar atmosphere coronal holes Alfvén waves