Title: Active region associated 5303 A emission
Author: K. B. Ramesh
Affil: Indian Institute of Astrophysics
Email: kbramesh@iiap.ernet.in
Authors: B. S. Nagabhushana, B. A. Varghese
Affils: Indian Institute of Astrophysics
Abstract: Homogeneous Data Set (HDS) of 5303 A green coronal emission obtained through a collective effort of many ground-based coronagraphic observatories show clear isolated strong emissions during the period of sunspot minimum. Typical emission intensities associated with active regions were found to be about 5 to 20 times stronger than the unper- turbed corona. Scrutiny of Stanford magnetograms show strong magnetic field gradients in those active regions. We infer that the flux emergence within or in the vicinity of a persistent active region seems to play an important role in the activity associated with the enhancement in 5303 A emis- sion. Also the intensity enhancements need not always ap- pear as a consequence of energetic events such as flares.