VANDENBERG AFB, CALIF. -- Technicians work on the Pegasus XL rocket, the vehicle that will launch the High Energy Solar Spectroscopic Imager (HESSI). The primary mission of HESSI is to explore the basic physics of particle acceleration and energy release in solar flares. The launch of PegasusXL_HESSI is scheduled for Feb. 5, 2002, from beneath an Orbital Sciences Corp. L-1011 aircraft over the Atlantic Ocean
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