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solar activity

noun, Astronomy.
the sum of all variable and short-lived disturbances on the sun, as sunspots, prominences, and solar flares. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for solar activity
Historical Examples
  • At the times of both of these eclipses the solar activity was decreasing.

    The Story of Eclipses George Chambers
  • The greater the solar activity the more is the chromosphere charged with the vapors of the lower strata of the sun's atmosphere.

    Astronomy for Young Folks Isabel Martin Lewis
  • The cycle of sun-spot change is attended by marked changes in many forms of solar activity.

    Astronomy for Young Folks Isabel Martin Lewis
  • There is clearly a connection between the solar activity as shown by the spots and the agitation of the magnetic needles.

    The Royal Observatory Greenwich

    E. Walter (Edwared Walter) Maunder
  • An unaccountable suspension of solar activity is, in fact, indicated.

  • As to causes, variations in solar activity are naturally receiving attention, and the results thus far are promising.

  • That figure, it will be recalled, shows what happens to precipitation when solar activity is increasing.

    Climatic Changes Ellsworth Huntington
  • The degree of solar activity would have much to do with the final extent of the ice sheets.

    Climatic Changes Ellsworth Huntington
  • In this connection, however, it must be remembered that solar activity may arise in various ways, as will appear more fully later.

    Climatic Changes Ellsworth Huntington
  • Two rather slender bits of evidence point to cycles of solar activity lasting hundreds of years.

    Climatic Changes Ellsworth Huntington

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