Originally Posted by Northwind View Post
Understood, the question rises then, what happens when the "flow of charged particles" encounters a substantial electric(magnetic) field? say the Earths, Jupiter a comets? Charge separation occurs? What happens to the flow?
That all depends on the situation. First of all, ecnountering electric fields is rather tricky in space, but if plasma gets into an electric field it will be accelerated, electrons in one direction, ions in the other, and the charge separation that created the electric field will quickly be negated and the electric field will be gone.
However at the Earth there is mainly a magnetic field. If e.g. you look at the plasma in the Jovian magnetosphere arriving at Europa, or if you look at the plasma of the solar wind arriving at Earth, you will find that the flow will be slowed down and the plasma will be diverted around the object, just like in a fluid (that is why plasmas can often be described as oridinary fluids).