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A study of line widths and kinetic parameters of ions in the solar corona

Astrophysics and Space Science volume 353, pages373–378(2014)Cite this article

Abstract

Solar extreme-ultraviolet (EUV) lines emitted by highly charged ions have been extensively studied to discuss the issue of coronal heating and solar wind acceleration. Based on observations of the polar corona by the SUMER/SOHO spectrometer, this paper investigates the relation between the line widths and kinetic parameters of ions. It is shown that there exists a strongly linear correlation between two variables (σ/λ)2 and M−1, where σ, λ and M are the half-width of the observed line profile at \(1/\sqrt{e}\), the wavelength and the ion mass, respectively. The Pearson product-moment correlation coefficients exceed 0.9. This finding tends to suggest that the ions from a given height of polar corona have a common temperature and a common non-thermal velocity in terms of existing equation. The temperature and non-thermal velocity are obtained by linear least-square fit. The temperature is around 2.8 MK at heights of 57″ and 102″. The non-thermal velocity is typical 21.6 km s−1 at height of 57″ and 25.2 km s−1 at height of 102″.

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Acknowledgements

Research by D.J. Wu and G.Q. Zhao was supported by the NSFC under grant Nos. 11373070 and 41074107, and by the MSTC under grant No. 2011CB811402. Research by C.B. Wang was supported by the NSFC under grants 41174123 and 41121003, and by the CAS under grant KZCX2-YW-QN512. We are appreciate many fruitful discussions with Professor C.S. Wu during this work. We are also grateful to the anonymous referee for valuable comments.

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  1. Purple Mountain Observatory, CAS, Nanjing, 210008, China
    • G. Q. Zhao
    •  & D. J. Wu
  2. University of Chinese Academy of Sciences, Beijing, 100049, China
    • G. Q. Zhao
  3. CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China
    • C. B. Wang
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Correspondence to D. J. Wu.

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Zhao, G.Q., Wu, D.J. & Wang, C.B. A study of line widths and kinetic parameters of ions in the solar corona. Astrophys Space Sci 353, 373–378 (2014). https://doi.org/10.1007/s10509-014-2072-y

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Keywords

  • Sun: corona
  • Sun: UV radiation
  • Sun: fundamental parameters