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Parker wind (or Parker wind model) refers to a model of solar wind developed by theorist Eugene Parker in the 1950s, who at the same time coined the term solar wind. The model agreed with subsequent space observations and still serves as a basic model of solar and stellar wind. Something like solar wind had long been known, from comet tails pointing away from the Sun, and given the extreme temperature of the corona, dynamics suggested the corona could not be static. The model consists of equations that correspond to the conditions that would produce a steady outward wind.