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The solar wind speed at Earth normally lies around 300km/sec but increases when a coronal hole high speed stream (CH HSS) or coronal mass ejection (CME) arrives. During a coronal mass ejection impact, the solar wind speed can jump suddenly to 500, or even more than 1000km/sec.
1,500-M.P.H. Winds Found on Neptune THE ASSOCIATED PRESS AN FRANCISCO -- Neptune is swept by 1,500 mile-an-hour winds, the fastest yet discovered in the solar system, scientists have determined from analyzing photographs taken by Voyager 2.