File:Sun on December 1th, 2020 - 12 00 UT (AR 2786) (50668350443).jpg

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Sun on December 1th, 2020 - 12:00 UT Credit: Giuseppe Donatiello

In recent months, solar activity has slowly begun to increase and new spots have appeared on the Sun. Sunspots are cooler areas of the Sun's photosphere and therefore appear darker. In fact, the temperature of the solar photosphere is about 5,700°K, while magnetism locally lowers the temperature to about 4,400°K. Sunspots are not black but orange. They often appear very dark due to the contrast and the filters used which reduce the brightness of the sun by 10 thousand times.

The first large group of spots from current Cycle 25 is AR2786, prominently seen in this image from December 1, 2020 at 12:00 UT.

ED127mm f/9 + Canon EOS 4000D stack of 9 frames.
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Source Sun on December 1th, 2020 - 12:00 UT (AR 2786)
Author Giuseppe Donatiello from Oria (Brindisi), Italy

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Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

This image was originally posted to Flickr by gjdonatiello at https://flickr.com/photos/133259498@N05/50668350443. It was reviewed on 5 December 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero.

5 December 2021

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