A measurement of the helium D3 profile with a birefringent filter |
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| Authors: | Barry J Labonte |
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| Institution: | (1) Big Bear Solar Observatory, Hale Observatories, Carnegie Institute of Washington, California Institute of Technology, Calif., U.S.A. |
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| Abstract: | The D3 line profile in plages on the disk is measured using a birefringent filter. The best fit Gaussian has a 1/e width of 0.4 Å, with negligible instrumental contribution. The D3 opacity is produced in regions with thermal linewidth -0.1 Å; the much larger observed width indicates large non-thermal motions in the chromosphere. |
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