This seven-million-cubic-foot super-pressure balloon is the largest single-cell, super-pressure, fully-sealed balloon ever flown. When development concludes, NASA will have a 22 million-cubic-foot balloon that
can carry a one-ton instrument to an altitude of more than 110,000
feet, which is three to four times higher than passenger planes fly. Ultra-long duration missions using the super pressure balloon cost considerably less than a satellite and the scientific instruments flown can be retrieved and launched again, making them ideal very-high altitude research platforms.
The test flight was launched December 28, 2008, from McMurdo Station, which is the National Science Foundation‘s logistics hub in Antarctica. The balloon reached a float altitude of more than 111,000 feet and continues to maintain it in its 11th day of flight. The flight tested the durability and functionality of the scientific balloon’s unique pumpkin-shaped design and novel material. The material is a special lightweight polyethylene film, about the thickness of ordinary plastic food wrap.
In addition to the super pressure test flight, two additional long-duration balloons have been launched from McMurdo during the 2008-2009 campaign. The University of Hawaii Manoa‘s Antarctic Impulsive Transient Antenna launched December 21, 2008, and is still aloft. Its radio telescope is searching for indirect evidence of extremely high-energy neutrino particles possibly coming from outside our Milky Way galaxy. The University of Maryland‘s Cosmic Ray Energetics and Mass, or CREAM IV, experiment launched December 19, 2008, and landed January 6, 2009. The CREAM investigation was used to directly measure high energy cosmic-ray particles arriving at Earth after originating from distant supernova explosions elsewhere in the Milky Way galaxy.
