Space Systems Environmental Interaction Studies.

The effort expended on Task 1 (the Photovoltaic Array Space Power Plus Diagnostics PASP Plus experiment) during the report period, went into on-orbit support for the mission. Amptek, Inc. was called upon to assist in understanding some anomalous behavior in an instrument's performance. On Task 2, the Charging Hazards and Wake Studies (CHAW S) program, the Digital Ion Drift Meter (DIDM) instrument design and build process got underway. Company personnel also supported PL/GPSG at several meetings which were held to discuss spacecraft systems and/or instrument design issues. In addition, the preparation of SPREE hardware for the upcoming re-flight continued. This effort is now almost at an end. Under Task 3, (the Space Wave Interactions with Plasma as Experiment (SWIPE) the hardware was subjected to flight environmental tests, which was successfully concluded, and then delivered to PL/GPSG. System integration testing at the payload integrator's facility was supported by company personnel.