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A spectroscopic study of solar spicules in Hα, Hβ and K

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Abstract

Simultaneous spectra of spicules in Hα, Hβ and the Ca ii K have been analyzed. These spectra were obtained with the échelle spectrograph of Sacramento Peak Observatory and have a resolution of 1.5 s of arc. Data include absolute intensities, velocities, linewidths and the optical depth at the center of Hα. Electron densities range between 6 × 1010cm−3 and 1.2 × 1011cm−3, while the range of the electron temperature is between 12000K and 15000K at a height of 5400 km above the limb. The analysis of the variation of the line of sight velocity across spicules shows that their rotation is very small. There is very good correlation in the structure of all three lines.

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Authors and Affiliations

  1. Astronomy Program, University of Maryland, Md., U.S.A.

    Constantine E. Alissandrakis

  2. Sacramento Peak Observatory, Air Force Cambridge Research Laboratories, Sunspot, N.M., U.S.A.

    Constantine E. Alissandrakis

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  1. Constantine E. Alissandrakis
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Alissandrakis, C.E. A spectroscopic study of solar spicules in Hα, Hβ and K. Sol Phys 32, 345–359 (1973). https://doi.org/10.1007/BF00154947

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  • DOI: https://doi.org/10.1007/BF00154947

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