Purpose of the flight and payload description
The purpose of the flight was to test the performance of a new auto level control system developed to maintain the balloon altitude at a certain level. This system was meant to be used in long duration balloon flights.
Details of the balloon flight
Balloon launched on: 9/9/2002
Launch site: Sanriku Balloon Center, Iwate, Japan
Balloon launched by: Institute of Space and Astronautical Science (ISAS)
Balloon manufacturer/size/composition: Zero Pressure Balloon model B5 5000 m3
Flight identification number: B5-138
End of flight (L for landing time, W for last contact, otherwise termination time): 9/9/2002
Balloon flight duration (F: time at float only, otherwise total flight time in d:days / h:hours or m:minutes - ): 14 h 15 m
The system's performance was verified in the simulated sunset conditions that were produced several times by controlling an air release valve during the flight, as well as at real sunset.