Purpose of the flight and payload description

The main objective of the flight was to collect ozone samples by means of a cryogenic device developed by the atmospheric research group at the Max-Planck-Institut for Nuclear Physics at Heidelberg, Germany. This new generation of collectors, can obtain carbon dioxide and ozone samples in separate low temperature traps at 80 K and 63 K, respectively. Four sets of dual traps are part of a balloon payload. Stratospheric air is forced through the first trap in which CO2 will condense, and will continue through a second trap where ozone is collected without condensing any of the major atmospheric gases. After sufficient amount of ozone is collected during float or during a slow descent the inlet is closed and the traps are briefly connected to a small pump to remove residual air before another pair of traps is switched to the inlet. Of the four samples obtained during a flight, two are usually collected during float and the other two during the descent. Either atmospheric temperature sensors were part of the payload or Vaisala ozone sondes were launched during or immediately before or after a balloon flight to provide temperature, total pressure, and ozone partial pressures.

Details of the balloon flight

Balloon launched on: 6/1/2005 at 23:05 local
Launch site: Domingos Rego Aerodrome, Timón, Maranhao, Brazil  
Balloon launched by: Centre National d'Etudes Spatiales (CNES)
Balloon manufacturer/size/composition: Zero Pressure Balloon model 150z Zodiac - 150.000 m3
End of flight (L for landing time, W for last contact, otherwise termination time): 6/1/2005
Balloon flight duration (F: time at float only, otherwise total flight time in d:days / h:hours or m:minutes - ): 15 m
Landing site: 3 km from Timón, Maranhao state , Brazil
Campaign: ELBC (Equatorial Large Balloon Campaign)  
Payload weight: 250 kg

The balloon was launched at 23:05 local time by dynamic method using an auxiliary balloon, but a hole in it prevented the flight. The instrument was dragged on the ground so after a few minutes the flight was aborted.

The balloon and the payload were recovered 3 kilometers from Timón (MA) by an helicopter.

External references

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