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Shifts of the Caii K line in Hei 10830 dark points

Solar Physics volume 107, pages 63–72 (1986)Cite this article

Abstract

We investigate the velocity field of the solar chromosphere at the location of 65 He i 10830 dark points (DP's). We have obtained spectra of such points in the vicinity of the Ca II K line. As a measure of differential chromospheric velocity, we use the shift of the K line center relative to a nearby photospheric Fe i line. We find that in He i DP's, the distribution of K line shifts is skewed towards the blue: the blueward skewing is more pronounced in He i DP's located in coronal holes. To the extent that He i DP's are proxies of coronal bright points, our study is relevant to previous reports of outflows from such bright points.

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Authors and Affiliations

  1. Physics Department, Swarthmore College, 19081, Swarthmore, PA, U.S.A.

    Rush D. Holt

  2. Bartol Research Foundation of the Franklin Institute, University of Delaware, 19716, Newark, DE, U.S.A.

    D. J. Mullan

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  1. Rush D. Holt
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  2. D. J. Mullan
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Holt, R.D., Mullan, D.J. Shifts of the Caii K line in Hei 10830 dark points. Sol Phys 107, 63–72 (1986). https://doi.org/10.1007/BF00155342

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  • DOI: https://doi.org/10.1007/BF00155342

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