Alexander Wilson was a Scottish surgeon, type-founder, astronomer, mathematician and meteorologist. He was the first scientist to use kites in meteorological investigations. He was the first Regius Pr
Portrait of Wilson
Wilson effect (astronomy)
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In astronomy, the Wilson effect is the perceived depression of a sunspot's umbra, or center, in the Sun's photosphere. The magnitude of the depression for the umbra is between 500 and 1000 km, with an
Alexander Wilson (astronomer)
…Wilson noted that sunspots viewed near the edge of the Sun's visible disk appear depressed below the solar surface, a phenomenon referred to as the Wilson effect. When the Royal Danish Academy of Sciences and Letters announced a prize to be awarded for the best essay on the nature of solar spots, Wilson submitted…
Wilson's original sketch demonstrating the Wilson effect.