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analysis of he i 1083 nm imaging spectroscopy using a spectral standardWe develop a technique. for the analysis of He I 1083 nanometer spectra which addresses several difficulties through determination of a continuum background by comparison with a well calibrated standard and through removal of nearby solar and telluric blends by differential comparison to an average spectrum. The method is compared with earlier analysis of imaging spectroscopy obtained at the National Solar Observatory/Kitt Peak Vacuum Telescope (NSO/KPVT) with the NASA/NSO Spectromagnetograph (SPM). We examine distributions of Doppler velocity and line width as a function of central intensity for an active region, filament, quiet Sun, and coronal hole. For our example, we find that line widths and central intensity are oppositely correlated in a coronal hole and quiet Sun. Line widths are comparable to the quiet sun in the active region, are systematically lower in the filament, and extend to higher values in the coronal hole. Outward velocities of approximately equal to 2 to 4 kilometers per second are typically observed in the coronal hole. The sensitivity of these results to analysis technique is discussed.
Document ID
Document Type
Preprint (Draft being sent to journal)
Malanushenko, Elena V.
(National Solar Observatory Tucson, AZ, United States)
Jones, Harrison P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 7, 2013
Publication Date
February 20, 2004
Subject Category
Solar Physics
Funding Number(s)
OTHER: 344-12-51-14
Distribution Limits
Work of the US Gov. Public Use Permitted.

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