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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.
the speed of an interplanetary solar sail spacecraft will depend on how long it has been propelled by sunlight the acceleration from sunlight is very small and depends on the size and weight of the sail and spacecraftor our lightsail 1 the acceleration from the solar force will be approximately 0 06 mm per second per second the real advantage of solar sailing is that unlike a chemical rocket that applies a lot of thrust for a very short time sunlight hitting the sail applies thrust continuously