jsc2022e091371 (12/7/2022) --- A view of a simulation of the STP-H9-ECLIPSE observations of the Mg+ emission mapping scheme. The left panel (aft view) shows the observations along the orbit plane used to infer the vertical ion distribution. The right panel (cross-track view) shows the map of the Mg+ emission cross-track beneath the ISS orbit. These two data sets are simultaneously tomographically inverted to infer the 3D ion distribution. Image courtesy of the Naval Research Laboratory.