flare (def 21).
a brief powerful eruption of particles and intense electromagnetic radiation from the sun’s surface, associated with sunspots and causing disturbances to radio communication on earth Sometimes shortened to flare See also solar wind
A sudden eruption of hydrogen gas in the chromosphere of the Sun, usually associated with sunspots. Solar flares may last between several hours and several days, and have temperatures ranging from 20 to 100 million degrees K. The energy of a solar flare, which consists primarily of charged particles and x-rays, is comparable to tens of millions of hydrogen bombs, but is less than one-tenth the total energy emitted by the Sun every second. First observed in 1859, solar flares dramatically affect the Sun’s weather and the solar wind, and are correlated with the appearance of auroras on the Earth. See also prominence.
noun 1. a furnace using sunlight concentrated by concave mirrors as the direct source of heat. solar furnace noun 1. a furnace utilizing the sun as a heat source, sunlight being concentrated at the focus of a system of concave mirrors
verb (used with object) 1. to heat (a building) by means of solar energy.
noun 1. a house designed to absorb and store solar heat.
noun 1. an instrument for measuring solar radiation. noun 1. any of various instruments for measuring solar radiation, as by use of a bolometer or thermopile Also called pyranometer