SWA Sensor Locations
The sensor accommodations on the satellite are shown in the figure. The SWA/HIS and SWA/PAS sensors need relatively narrow fields of view which are centred on the Sun-direction, since the protons, alpha-particles and heavy ions generally arrive at the spacecraft from the Sun direction with very little thermal spread and only modest angular deflection due to the spacecraft motion. These field of views are provided by cut-outs in the corners of the spacecraft heat shield. Conversely, electrons have large thermal spread and can arrive from any direction. Thus the SWA/EAS sensor is mounted in the spacecraft shadow at the end of the instrument boom, such that the amount of field-of-view blockage by the spacecraft and its appendages is minimised.
Page last modified on 25 aug 11 11:30