Purpose of the flight and payload description

The flux of cosmic-ray electrons in the energy interval of 17-63 MeV was measured by an instrument specifically designed to detect cosmic ray electrons. The system was composed by two scintillation-telescope counters that defined the acceptance cone of the system, and a gas Cerenkov counter filled with SF, at 2.2 atm absolute pressure.

Details of the balloon flight

Balloon launched on: 4/7/1967 at 11:27 utc
Launch site: Columbia Scientific Balloon Facility, Palestine, Texas, US  
Balloon launched by: National Center for Atmospheric Research (NCAR)
Balloon manufacturer/size/composition: Zero Pressure Balloon Winzen 10.600.000 cuft (0.5 Mil.)
Flight identification number: 288P
End of flight (L for landing time, W for last contact, otherwise termination time): 4/7/1967 at 21:55 utc
Balloon flight duration (F: time at float only, otherwise total flight time in d:days / h:hours or m:minutes - ): 5 h
Landing site: Successful flight. Balloon don't reach the float altitude.
Payload weight: 555 lbs

Successful flight. Balloon don't reach the float altitude.

Postal cover issued on launch day commemorating the flight

External references

If you consider this website interesting or useful, you can help me to keep it up and running with a small donation to cover the operational costs. Just the equivalent of the price of a cup of coffee helps a lot.