Ionospheric Plasma Trajectories
ASTRA uses a convection-driven plasma trajectory analysis, developed by Crowley et al 2000, which uses the potential patterns from AMIE together with the Earth’s corotation potential to obtain ion drift velocities and corresponding orizontal plasma trajectories at high latitudes. Both forward trajectories and back trajectories can be obtained, permitting investigation of the evolution and source of an ionospheric plasma parcel.
Neutral Parcel Trajectories
ASTRA has developed a neutral-wind driven trajectory analysis which uses TIME-GCM neutral winds to compute 2-D and 3-D parcel trajectories.