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The solar cycle describes an 11-year period of solar activity driven by the sun s magnetic field and indicated by the number of sunspots visible on the surface.

Phil scherrerHeinrich schwabeSpace technologyOperations mission directorateNational oceanicAtmospheric administrationWorld data centerSpace weather prediction centerStanford universityGlobal positioning systemsInternational space stationSunspot indexLong term solar observationsRoyal observatoryWeather prediction centerHeliospheric observatory