On the left, the sun in white light with the sunspots easily visible in the middle of the photospheric granulation, the largest showing a central umbra surrounded by a penumbra. Some faculae (bright spots) are visible around the sunspot group on the right. The image on the right shows a photograph taken at the same moment in Hαlight: a bright flare is occurring in an active region.
Chapter 6
The Sun
In our galaxy, the sun is an ordinary star. But it is 300,000 times closer to the earth than the second nearest star (Proxima Centauri). And for us, this changes everything: it is the only star on which we are able to photograph numerous and ever-changing ...
Get Astrophotography now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
