solar activity

noun Astronomy.
the sum of all variable and short-lived disturbances on the sun, as sunspots, prominences, and solar flares.
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So variations in solar activity can drive changes in the weather.
The cause is generally ascribed to a combination of diminished solar activity
  and large volcanic eruptions.
Twice a day visitors can glimpse sunspots, flares, and other solar activity.
Satellites have revealed that the upper atmosphere actually swells by day and
  contracts by night due to solar activity.
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