2021 April 21 Sun - solar surface in H-alpha, with AR12815, AR12816, AR12817 and AR12818
AR12815 is close to the SE limb at (S21W77). Faint plages and filaments are still visible. 2 small prominences are observed to grow from this AR, and produces an interesting eruption. (I'll post this later)
AR12816 is today located at (S24E08). This group has been very active in the past 24 hours. Flares from this group have subsided, leaving some plages. 3 sunspots are visible in H-alpha. Arch filaments are observed to connect the 2 following sunspots.
AR12817 is located at (N18W60). Apart from the 3 major sunspots, flares are observed to the east of the leading sunspot,
AR12818 is near the SE limb, at (S17E66). A large sunspot with penumbrae is visible. The bright plages are mostly to the south.
sunspot count: group=3, sunspot=17, R=47
Dark filaments are visible to the NW and SE. The filaments near the SE limb is connected with the huge prominences there.
Telescope: Lunt LS50T with B1200 blocking filter, and 2X barlow
Camera : ASI174MM
approximately north is up, east to the left
2021 April 21 Sun - solar surface in H-alpha, with AR12815, AR12816, AR12817 and AR12818
2021 April 21 Sun - solar surface in H-alpha, with AR12815, AR12816, AR12817 and AR12818
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Re: 2021 April 21 Sun - solar surface in H-alpha, with AR12815, AR12816, AR12817 and AR12818
Images of AR12816
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Re: 2021 April 21 Sun - solar surface in H-alpha, with AR12815, AR12816, AR12817 and AR12818
Images of AR12817
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Re: 2021 April 21 Sun - solar surface in H-alpha, with AR12815, AR12816, AR12817 and AR12818
Images of AR12818
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Re: 2021 April 21 Sun - solar surface in H-alpha, with AR12815, AR12816, AR12817 and AR12818
Images of filaments near SE limb
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