Atmosphere-Space Transition Region Explorer (ASTRE) is an explorer program mission to study the interaction between the Earth's atmosphere and the ionized gases of space in an effort to understand space-induced currents in electric power grids originate as well as improve satellite drag models. The principal investigator is Robert Pfaff Jr. Goddard Space Flight Center in Greenbelt, Maryland.
References
Atmosphere-Space Transition Region Explorer Wikipedia(Text) CC BY-SA