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[71.05] Differentiating Coronal Holes from the Quiet Sun by He 1083 nm imaging spectroscopy.

O. V. Malanushenko (National Solar Observatory), H.P. Jones (NASA's GSFC)

We applied our new analysis technique to several examples of He I 1083 nm imaging spectroscopy obtained with the NASA/NSO Spectromagnetograph at the NSO/Kitt Peak Vacuum Telescope. We studied correlations of intensity vs width and Doppler velocity in several coronal holes and areas of chromospheric network in the quiet Sun. We confirm our previous result, which was based on a single example, that the correlation of line width and central intensity is opposite in coronal holes and quiet Sun. Suitably normalized linear combinations of width and intensity can be used to distinguish between quiet Sun and coronal holes.

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Bulletin of the American Astronomical Society, 36 #2
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