Sunspot activity according to Greenwich observations

Physics

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Astronomical Catalogs, Astronomical Observatories, Sunspot Cycle, Sunspots, Extremum Values, Spectroheliographs

Scientific paper

This article presents a survey of studies incorporating methods of evaluation of Greenwich observations. It also describes some extreme sunspot groups (i.e., groups with a very large area, a very long life, and/or in very high heliographic latitudes); data on the total areas of the largest sunspots are given, and a survey of the parameters concerning individual 11-year cycles, resulting from Greenwich Photoheliographic Results, is presented.

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