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Properties of Circumfacular Regions derived from H$α$ and Ca II K synoptic observations of the Sun

Criscuoli, Serena et al.
arXiv (All) · Papers
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Circumfacular regions are dark chromospheric structures surrounding magnetic regions whose properties and contribution to solar activity diagnostics remain poorly understood. We investigate their photometric and geometric properties using full-disk H$α$ and Ca II K observations acquired by the Chrom
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