I joined my friend Tony Donnangelo for some Friday morning (~15:30 to 16:00 UT) H-alpha solar observing today. I arrived after most of the activity that Tony saw some two hours earlier had subsided but there was still a fairly large, horizontally-branching prominence on the trailing limb that slowly morphed into what looked like a loop, as well as a couple of small prominences. A Lumicon Solar Prominence filter allowed us to make these observations.
There were only 3 sunspots to be seen when we switched to a Baader AstroSolar white light filter. The one nearest the preceding limb, AR 10411, seemed to have a double umbra. AR 10414, the largest one, was closer to the sun's center and had a complex umbra. The third spot (AR 10420) was just making headway on the disk from the trailing limb.
We used Tony's Takahashi FS-102 apochromatic refractor and a 3-6mm Tele Vue Nagler zoom, a 5.2mm Pentax SMC XL, a 7mm Nagler type 6, and a 9mm Nagler type 6 during the observing session.
Dave Mitsky
There were only 3 sunspots to be seen when we switched to a Baader AstroSolar white light filter. The one nearest the preceding limb, AR 10411, seemed to have a double umbra. AR 10414, the largest one, was closer to the sun's center and had a complex umbra. The third spot (AR 10420) was just making headway on the disk from the trailing limb.
We used Tony's Takahashi FS-102 apochromatic refractor and a 3-6mm Tele Vue Nagler zoom, a 5.2mm Pentax SMC XL, a 7mm Nagler type 6, and a 9mm Nagler type 6 during the observing session.
Dave Mitsky
Chance favors the prepared mind.
De gustibus non est disputandum.
