active sun

noun Astronomy.

the sun at a maximum of solar activity, occurring every 11 years.
solar activity, superimposed on an unchanging background.

Nearby words

  1. active safety,
  2. active service,
  3. active shooter,
  4. active site,
  5. active splint,
  6. active transport,
  7. active vocabulary,
  8. active voice,
  9. actively,
  10. activewear

Origin of active sun

First recorded in 1975–80 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019