Simplified expected behavior across some structures in the solar wind:

  Vsw Np Vth B
         
fast FWD shock increases increases increases increases
fast REV shock increases decreases decreases decreases
         
slow FWD shock increases increases increases decreases
slow REV shock increases decreases decreases increases
         
classical CME TD/CD steady decreases decreases increases
         
classical high-speed stream increases decreases increases decreases