At what speed is the alpha radiation in Solar wind reaching the Earth?

Question:

Answer:
The speed does vary but the average would be about 400km/sec as it leaves the sun. Not all of that will reach the earth. Further, its velocity will decrease. Most of the radiation will be deflected by the earth's magnetosphere.

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Hi. There is no set speed. It depends on the kinetic energy of the particle. (Two protons and two neutrons.)

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