Astronomy. A sudden outpouring of light, energy, or particles from the sun, another star, or other celestial object; spec. a sudden increase in the…

a radio emission from the sun consisting of a succession of short bursts or pips in the megahertz range that lasts for a period of hours or days…

the stream of ions and electrons which constantly emanates from the sun and which permeates the solar system.

= solar wind n. below.

The solar wind (see solar, adj.), or a similar stream of particles emanating uniformly from any other star.