So, to protect astronauts, we could surround the ships with a bubble of plasma and deflect those nasty charged particles

Article not very recent (sorry about that)
http://www.newscientist.com/article/dn9 ... -trip.html
Also, you might be interested to know that plasma can be used to make windows, a plasma window can be passed through by solid objects and light, but it can effectively form a barrier to keep, let's say the atmosphere of your spaceship on one side and the vacuum of space on the other. Translated: Star Trek-type force fields !
http://en.wikipedia.org/wiki/Plasma_window