Abstract
Imaging spectroscopy of the Sun was carried out at the California State University Northridge San Fernando Observatory using an InGaAs near-IR video camera. Using the Si i 1082.71 nm and He i 1083.03 nm lines the Evershed effect is measured simultaneously in the photosphere and the chromosphere for three sunspots; the speed of the Evershed flow is measured to be between 3 to 8 times greater in the He i line than in the Si i line, and the direction is radially inward in the chromosphere and outward in the photosphere. Telluric absorption lines prevented a meaningful measurement of O i 1128.7 nm limb emission, but an upper limit of 20×10−3 B⊙ is measured for chromospheric limb emission at O i 1316.3 nm. Zeeman splitting in Fe i 1564.9 nm was observed in six sunspot umbrae, and a linear relationship between magnetic field and umbral continuum intensity is confirmed.
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Penn, M., Ceja, J., Bell, E. et al. Infrared Spectroscopy from San Fernando Observatory: He I 1083 nm, O I 1316 nm, and Fe I 1565 nm. Solar Physics 205, 53–61 (2002). https://doi.org/10.1023/A:1013811705854
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DOI: https://doi.org/10.1023/A:1013811705854