The Sun Acts Up: 4-September-2017

There are two massive sunspot groups (and a couple of smaller groups) visible today. This taken at 1434UT using a Nikon D810 and 500mm telephoto through Baader film.  Click image for full resolution.

2017-09-04-sunspots

2017-09-04-sunspots

About johnb

– Director of Grainger Observatory, Phillips Exeter Academy.
– Variable-star-crazed astronomer, but have done research in other areas.
– Drummer, archer, pilot, chef, friend, pet owner, husband, father, Train-nut.

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