An Improved Calibration for Obtaining Intensity and Line-of-Sight Velocity Using MLSO/CHIP He I 1083 nm Observations

Details An Improved Calibration for Obtaining Intensity and Line-of-Sight Velocity Using MLSO/CHIP He I 1083 nm Observations An Improved Calibration for Obtaining Intensity and Line-of-Sight Velocity Using MLSO/CHIP He I 1083 nm Observations

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.5512d&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #55.12; Bulletin of the American Astronomical Society, Vol. 34, p.733

Astronomy and Astrophysics

Astronomy

Scientific paper

A calibration technique has been developed utilizing normalized intensities measured at seven different He I filter positions which are used to infer the line-of-sight velocity of structures observed with the Mauna Loa Solar Observatory (MLSO) CHIP He I filter. To obtain He I intensity, the outputs from each of the seven filter positions are normalized to reflect only the photospheric continuum radiation and the He I 1083 nm absorption or emission line. Velocity is inferred from an application of these normalized intensities to an algorithm derived from an empirical analysis of synthetic spectra. Both the normalization technique and the application of the algorithm are presented as well as some example events. The High Altitude Observatory is a division of the National Center for Atmospheric Research operated by the University Corporation for Atmospheric Research under sponsorship of the National Science Foundation.

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