solar activity
  • Phrase applied to everything other than the normal emission of radiation by the Sun, especially the appearance of sunspots and disturbances of the Sun’s magnetism. This activity is associated with flares and increased emissions of energetic particles from the Sun, and has direct effects upon the Earth, especially upon radio reception and the appearance of the aurora.
  • The occurrence of events, such as sunspots and solar flares, which change variables such as the energy released or the radio noise produced by the sun.

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