Infrared Spectroscopy from San Fernando Observatory: HeI 1083 nm, OI 1316 nm, and FeI 1565 nm

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 Sii 1082.71 nm and Hei 1083.03 nm lines the Evershed effect is measured simultaneously in the photosphere and the chromosphere for th...

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Bibliographic Details
Published in:Solar physics 2002-01, Vol.205 (1), p.53
Main Authors: Penn, Mj, Ceja, Ja, Bell, E, Frye, G, Linck, R
Format: Article
Language:English
Subjects:
Emission measurements
Infrared spectroscopy
Magnetic fields
Spectrum analysis
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Summary: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 Sii 1082.71 nm and Hei 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 Hei line than in the Sii line, and the direction is radially inward in the chromosphere and outward in the photosphere. Telluric absorption lines prevented a meaningful measurement of Oi 1128.7 nm limb emission, but an upper limit of 20×10^sup -3^ B^sub ^ is measured for chromospheric limb emission at Oi 1316.3 nm. Zeeman splitting in Fei 1564.9 nm was observed in six sunspot umbrae, and a linear relationship between magnetic field and umbral continuum intensity is confirmed.[PUBLICATION ABSTRACT]
ISSN:0038-0938
1573-093X
DOI:10.1023/A:1013811705854