Where are the SSIES instruments located on DMSP and what coordinate system is being used?
The figure below shows a schematic drawing of the DMSP spacecraft in flight. DMSP is a three-axis stabilized spacecraft and the view is of the front side of the spacecraft as it moves around the Earth. Thus the velocity vector is out of the page towards the viewer and the RPA, IDM, and scintillation meter are hanging off the bottom side of the spacecraft and facing into the ram direction. For the SSIES data here we use a coordinate system where +x is out of the page (towards the viewer), +y is horizontal to the right, and +z is vertical upward away from the center of the Earth.
