香港天文論壇

Images of AR12866 and AR12868

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Images of AR12864 and AR12865

2021 September 07 Sun - solar surface in Ca-K, with AR12863, AR12864, AR12865, AR12866 and AR12868. AR12863 is located at (S16W28). 2 sunspots are observed. The leading large sunspot, with fully developed penumbra, are better observed in Ca-K than white-light. AR12864 is located at (N24W19). About 5...

Images of AR12868

Images of AR12866

Images of AR12864

2021 September 07 Sun - solar surface in white-light, with AR12863, AR12864, AR12865, AR12866 and AR12868. AR12863 is located at (S16W28). 2 sunspots are observed. This AR is dominated by the leading large sunspot, which comes with fully developed penumbra. AR12864 is located at (N24W19). At least 1...

Images of AR12866 and AR12868

Images of AR12864 and AR12865

2021 September 06 Sun - solar surface in H-alpha, with AR12863, AR12864, AR12865, AR12866 and AR12868. AR12863 is located at (S16W12). The large leading sunspot is observed. Plages are mostly close to the following small sunspots (not visible in H-alpha). A flare shows up south of the leading sunspo...

Images of AR12866 and AR12868

Images of AR12864 and AR12865

2021 September 06 Sun - solar surface in Ca-K, with AR12863, AR12864, AR12865, AR12866 and AR12868. AR12861 is now located at (N16W80), Nothing is observed. AR12863 is located at (S16W12). 3 of the 5 sunspots are observed. Apart from a fully developed penumbra, a ring of plages is also observed arou...

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