Trailblazer + PEGASO (Polar Explorer for Geomagnetics And other Scientific Observations)

The balloon took part of a campaign designed to prove concept for launching larger Long Duration Balloons (LDB) in the future from Svalbard Islands. As the balloons reached float altitude and circumnavigated the polar region between 78 and 80 deg. N. throught the GPS/ARGOS payload was obtained a trajectory showing the stratospheric circulation pattern of stratospheric winds, diurnal excursions, and potential termination/impact locations for the future LDB flights.

The balloon carried also an Italian built payload called PEGASO (Polar Explorer for Geomagnetism And other Scientific Observations) in the framework of the PNRA program (Antarctic Italian Program) around the northern polar region.

The payload, constructed by National Institute for Geophysics and Volcanology (INGV), was designed for geomagnetism, but supports additional scientific packages, supplying power and collecting data. The built-in scientific instrument is a 3-axis ring-core fluxgate geophysical magnetometer, kept far from the rest of the payload by an aluminum boom. PEGASO includes a GPS system for data localization and uses an Iridium bi-directional Telemetry for data download and flight remote control (ballast release and termination) through a ground station.

The stratospheric balloon carries a secondary tracking system (GPS/Argos transmitter) used to track the balloon payload system along with the Iridium communication package. The float altitude of the balloon is useful for the study of the radial variation of the geomagnetic field. The definition of the magnetic anomalies in the surveyed region will be highly improved, due to the long distances traveled during the flight.

Balloon launched on: 7/6/2005 at 23:00 local
Launch site: Longyearbyen Airport, Svalbard, Norway  
Balloon launched by: ISTAR (International Science Technology And Research)
Balloon manufacturer/size/composition: Zero Pressure Balloon Raven 10.000 m3
Flight identification number: SVAL-09
End of flight (L for landing time, W for last contact, otherwise termination time): 7/19/2005 at 17:56
Balloon flight duration (F: time at float only, otherwise total flight time in d:days / h:hours or m:minutes - ): 14 d
Landing site: Over international water (pack-ice) at 17:57 utc at 72º 51.969' N - 176º 47.698' W
Campaign: Arctic LDB Program Development 2005 designed to prove concept for launching larger Long Duration Balloons (LDB) in the future from Svalbard Islands

At 23:00 Local the second launch of the 2005 campaign took place from the Longyearbyen airport.

The launch was done in near ideal conditions: light cloud cover with winds < 2kts.

Ascent was nominal at 5 m/s. The balloon reached float altitude of 36500m but nominal float was a bit lower.

All systems, ARGOS and IRIDIUM functioned very well as designed.

Finally after 14 days aloft, the flight was terminated while flying at 35366 meters at 72º 53.480' N - 176º 13.641' W

The balloon impacted over international water (pack-ice) at 17:57 utc at 72º 51.969' N - 176º 47.698' W

• ISTAR Group website of the group that managed the entire launch operation
• PEGASO: An ultra light long duration stratospheric payload for polar regions flights Advances in Space Research, Volume 42, Issue 10, p. 1633-1640
• PEGASO: long duration balloons from north pole XVIII Congresso Nazionale AIDAA