Saturday, October 16, 2004
Sunspot group 667

On September 4 2004 I observed the sunspot group 667 from 08:00 UT until 10.30 UT with the four inch refractor, the Baader ND5 full aperture filter, and three other Baader filters, the Fringe Killer, Continuum and Contrast Booster. Again with a

Posted by Math on 10/16 at 08:09 AM | filed in: Solar log | Print