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Words related to sunspot

sun·spot
S s

  • penumbra

    Astronomy. the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off. Compare umbra (def 3a). the grayish marginal portion of a sunspot. Compare umbra (def 3b).

  • plage

    a sandy bathing beach at a seashore resort.

  • relative sunspot number

    a number indicating the degree of sunspot activity on the sun as a factor of observer idiosyncrasies, the number of sunspot groups, and the number of individual sunspots.

  • solar cycle

    the variation of sunspots, prominences, flares, and other solar activity through an 11-year cycle.

  • sunspot cycle

    the cycle, averaging in duration slightly more than 11 years, in which the frequency of sunspots varies from a maximum to a minimum and back to a maximum again.
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