Ram/Wake effect

Hi, I have to simulate ram/wake efefct in LEO-ionosphere plasma. Spacecraft has a velocity of 7500 m/s along X.
I see that SPIS allows to define Spacecraft and ion velocity in the three xyz direction. Supposing that the Ion velocity depends on their temperature and that the code evaluates it automatically once defined ions population, I set V_sat_x = 7500 m/s, V_sat_y=V_sat_z=0 and V_ions_x, y, z = 0. Is this the right way to proceed?

Yes it is.