active sun

noun Astronomy.

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

Origin of active sun

First recorded in 1975–80

Words nearby active sun

active safety, active service, active shooter, active site, active splint, active sun, active transport, active vocabulary, active voice, activewear, active‐matrix