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A filament observed on 05/20/2015 at 14:43 UT
Solar flare is classified as X, M, C, B and A categories according its X-ray peak flux with X level is the most intense level.
Note: These days a large sunspot group appeared in the center of the solar disk which could be seen by naked eye through a Baade Film. Never directly stare the Sun without any protection. 10/24/2014
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