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The He ii Lines in the Lyman Series Profiles of Solar Prominences

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Abstract

The hydrogen and helium lines are the most prominent lines in the solar prominences spectra. Observations with the SUMER spectrometer onboard SOHO showed that there are weak lines in the blue wings of the Lyman series which affect their profiles. They were all identified as He ii lines in the Lyman series wings, except for the Lα line whose profile was affected by the use of an attenuator. The He ii lines are the even Balmer lines of the He ii system, a set of lines that we complete with the odd ones. We characterize them by comparison with the blue wings of the Lyman series in order to improve the H Lyman series observations and modeling, on one hand and to provide He ii lines observations for further combined H – He i – He ii modeling, on the other hand.

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Authors and Affiliations

  1. Institut d’Astrophysique Spatiale, Unité Mixte CNRS-Université de Paris XI, Bat 121, 91405, Orsay, France

    H. Ebadi & J.-C. Vial

  2. Faculty of Physics, Tabriz University, Tabriz, Iran

    H. Ebadi & A. Ajabshirizadeh

  3. Research Institute for Astronomy and Astrophysics of Maragha, 55134-441, Maragha, Iran

    H. Ebadi & A. Ajabshirizadeh

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  1. H. Ebadi
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  2. J.-C. Vial
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  3. A. Ajabshirizadeh
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Correspondence to H. Ebadi.

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Ebadi, H., Vial, JC. & Ajabshirizadeh, A. The He ii Lines in the Lyman Series Profiles of Solar Prominences. Sol Phys 257, 91–98 (2009). https://doi.org/10.1007/s11207-009-9368-z

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  • DOI: https://doi.org/10.1007/s11207-009-9368-z

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