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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information AFRL-VS-PS-TP-2006-1032 SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. (Clearance #VS06-0146) SUPPLEMENTARY NOTES ABSTRACTThis paper reports the results of an international measurement round robin of monolithic, triple-junction, GaInP/GaAs/Ge space solar cells. Eight laboratories representing national labs, solar cell vendors and space solar cell consumers, measured cells using in-house reference cells and compared those results to measurements made where each lab used the same set of reference cells. The results show that most of the discrepancy between laboratories is likely due to the quality of the standard cells rather than the measurement system or solar simulator used. SUBJECT TERMS

The need for microsatellites to generate the maximum power from small body mounted solar panels has led in many cases to the first demonstration of advanced technologies on these spacecraft. Because of the short schedules characteristic of microsatellite programmes there is the opportunity to obtain real flight data for new solar cells which can be valuable in designing solar arrays for future large scale spacecraft. This paper presents flight and ground test data from test cells flown on the University of Surrey's UoSAT-5 microsatellite. By comparing the relative rates of degradation of cell& from the on board solar cell experiment the performance of space solar panels using the different advanced space solar cell technologies are predicted and corapared with conventional silicon.

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