Bandyopadhyay, A; Pandey, P; Narayan, A; Biswas, C; Neogy, S
(Indian Institute of Astrophysics, Bangalore, 1997)
Equipment: Celestron C-14 Schmidt Cassegrain Telescope (14" diameter), off-axis 6" solar filter, ST6 CCD camera, Off-axis polaroid filter 6" rotatable in steps of 60 degree.