Mars,the forth planet in the solar system,has many Earth-like features.It may contained water on its surface long period ago and some of these water may escaped from Mars as H+and O+/O2+from Martian atmosphere.These ionospereic ions could gain energy from solar wind and accelerate to escape.Solar wind dynamic pressure is one of the solar wind physical parameters,which can be used to calculate the efficacy of solar wind which transferred its energy to planetary ions.
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