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Key terms: sunspot solar cycle observed activity spots magnetic flux wolf filter variation minimum rotation visible surrounding polarity sunspot activity s surface flare photosphere sunset aurora sunspot cycle magnetic field galileo phenomena satellite solar activity solar constant solar telescope sunspot numbers number of sunspots solar cycle convection sunspots were rarely observed sunspot index fabricius solar rotation astronomers mancha solar kelvin stellar astronomy measured observatory cyclic virus space weather maunder indirectly Search external links cited by footnotes on Wikipedia page Sunspot: |
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