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In page Solar wind:

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The solar wind is observed to exist in two fundamental states, termed the slow solar wind and the fast solar wind, though their differences extend well beyond their speeds. In near-Earth space, the slow solar wind is observed to have a velocity of 300–500 km/s, a temperature of ~100 kilokelvin and a composition that is a close match to the corona. By contrast, the fast solar wind has a typical velocity of 750 km/s, a temperature of 800 kilokelvin[citation needed] and it nearly matches the composition of the Sun's photosphere.[1] The slow solar wind is twice as dense and more variable in nature than the fast solar wind.[2][3]