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Coronal line intensity as an integrated index of solar activity

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Abstract

The relation between coronal green line intensity and high-speed streams of solar wind emitted by coronal holes or by loop structures of the corona is studied. As well as these exclusive regions of coronal radiative emission, other factors of solar activity have been taken into account in this relation, such as proton events, sunspot number, faculae, and solar magnetic fields.

Although the investigated time period (1964–1974) is very short, because of lack of data, we attempted to define the intensity of the coronal green line as an integrated index of the solar activity which can express all the photospheric and coronal phenomena of the Sun. The contraction of the low-density coronal-hole regions and the presence of bright loops during solar maximum provide a theoretical explanation of the above-mentioned relation.

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Authors and Affiliations

  1. Research Center for Astronomy and Applied Mathematics, Academy of Athens, Greece

    J. Xanthakis & B. Petropoulos

  2. Physics Department, Nuclear and Particle Physics Section, University of Athens, Greece

    H. Mavromichalaki

Authors
  1. J. Xanthakis
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  2. B. Petropoulos
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  3. H. Mavromichalaki
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Xanthakis, J., Petropoulos, B. & Mavromichalaki, H. Coronal line intensity as an integrated index of solar activity. Astrophys Space Sci 164, 117–130 (1990). https://doi.org/10.1007/BF00653557

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  • DOI: https://doi.org/10.1007/BF00653557

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