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

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

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002soph..205...53p&link_type=abstract

Solar Physics, v. 205, Issue 1, p. 53-61 (2002).

Physics

6

Scientific paper

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^-3 B_solar 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.

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