Abstract
With the observations from the Solar Dynamics Observatory , we investigate the boundary evolution of a coronal hole (CH). Small-scale solar activity ( e.g. , coronal jet) can lead to gradual change of CH boundaries (CHBs). Besides gradual change of CHBs, a quiet Sun region can change into a CH region on a large scale when magnetic fields in the photosphere evolve from mixed-polarities into one-polarity dominance. CH regions can also evolve into quiet regions on a large scale when the underlying photosphere becomes mixed-polarity fields from one-polarity dominated fields.
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