Image: The sun in 2019 | 1/28/2019 | Staff
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The changing activity of our sun as seen by ESA's Proba-2 satellite in 2019.

The satellite is continuously monitoring the sun—one image was selected to represent each day of the year in this montage of 365 suns. The images were taken by the satellite's SWAP camera, which works at extreme ultraviolet wavelengths to capture the sun's hot turbulent atmosphere—the corona, at temperatures of about a million degrees.

Sun - Levels - Activity - Minimum - Activity

Throughout 2019, the sun showed low levels of activity, as it is currently at the minimum of its 11-year activity cycle. The most energetic flare of the year was observed on 6 May close to the eastern limb of the sun (the left side of the sun in the corresponding image). It was classified as a C9.9 class flare that divides solar flares according to their strength. The smallest are A, followed by B, C, M and X, with each letter representing a ten-fold increase in energy output such that an X-class flare is 100 times stronger than a C-class flare.

Proba-2 also performed various scientific campaigns in 2019. One of these campaigns is evident in the images...
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