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On the 26th September 2023 member Simon Dawes imaged the Sun. One of his images of the sunspots on the Sun that day showed an interesting effect called the ‘Wilson Effect’. The Wilson effect is the perceived depression of a sunspot’s umbra or centre in the Sun’s photosphere.
Sunspot AR3443 showing the ‘Wilson Effect’
https://britastro.org/section_information_/solar-section-overview/wilson-effect-observers-challenge