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Radiant Boundary
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This series of synoptic images were taken from October 4-7, 2012. A coronal hole is situated between two active regions. On the 5th, there is a B7.8 flare near the western edge of the coronal hole generating a dazzling display of bright arcs. The next synoptic image shows a sharp well-defined coronal hole boundary with long dark streaks along the western edge. The coronal hole is growing; eroding its banks as a fast flowing river would. Finally, the last image shows another, quieter flare. This event wasn't strong enough to be marked in NOAA's flare ledger—nonetheless, it is still magnificent.
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(Prepared by Patricia Jibben)
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