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Definitions of sunspot:



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bit-rot-computer-jargon cosmic-ray lunar-phase sun photosphere solar-cycle aurora zeeman-effect doppler-effect geomagnetic-storm elementary-particle atmosphere earth nasa solar-and-heliospheric-observatory march-30 2001 coronal-mass-ejection april-2 magnetic-field magnetism convection river-kelvin electric-arc solar-variation coronal-loop magnetic-reconnection solar-flare star john-of-worcester solar-radiation-2 carbon-dioxide 1700s maunder-minimum 1600s little-ice-age timeline-of-chinese-astronomy 28-bc book-of-han charlemagne galileo-galilei 1612 1610 thomas-harriot david-fabricius 1611 christoph-scheiner solar-system aristotle heliocentrism nicolas-copernicus heinrich-schwabe 1826 1843 rudolf-wolf 1848 joseph-henry gustav-sp-rer william-stanley-jevons edward-walter-maunder polar-aurora corona solar-eclipse-3 1715 september 1859 november-4 2003 ultraviolet trace5 fluxon differential-rotation wilson-effect vortex-4502 tropical-cyclone sp-rer-s-law-2 wolf-number george-ellery-hale babcock-model transit-of-mercury macula flash-burn filter-optics welding-helmet h-alpha vacuum-deposition optical-density space-weather ionosphere shortwave radio-propagation communications-satellite list-of-solar-cycles solar-rotation 2007 march0 2005 spencer-r-weart american-institute-of-physics new-scientist