Two rockets fly through auroral arc
January 30, 2009After days of waiting for precise aurora conditions, a team from the University of Iowa finally saw the launch of its two scientific sounding rockets from Poker Flat Research Range. The NASA rockets launched Jan. 29, just before 1 a.m. Alaska Standard Time, and flew through an auroral curtain, collecting data throughout their flights.
Scientists with the Auroral Current and Electrodynamics Structure mission, or ACES for short, aimed to gain a clearer picture of aurora structure by simultaneously collecting data from both the top and bottom edges of an auroral arc. To get the data, two rockets were launched. A two-stage Black Brant IX launched at 12:49 a.m. and reached an altitude of more than 226 miles. The rocket flew for just under 10 minutes. At 12:50 a.m., a single-stage Black Brant V launched, reaching an altitude of nearly 83 vertical miles, flying for roughly eight minutes.
The payloads of each ACES rocket performed well during flight. Principal Investigator Scott Bounds of the University of Iowa and the ACES team will begin to analyze all of the data collected, which should keep them busy for the next year. Bounds said this information will help refine current models of aurora structure. The ACES mission will provide insight on the structural subtleties of the aurora, details that researchers may have missed when previous measurements were done using only a single vehicle.
The ACES rockets were loaded onto launchers and had been ready to fly since Jan. 14. Each evening scientists scanned the sky with cameras at local and downrange sites for a sufficient auroral arc to appear just north of Fort Yukon. A stable, thin arc was required for the experiment to perform optimally and finally that arc appeared early on Jan. 29.
Bounds, from the Department of Physics and Astronomy at the University of Iowa, worked on six previous launches from Poker Flat Research Range as a postdoctoral fellow and as a co-investigator. The ACES mission is the first project he's managed as the principal investigator.
"I certainly feel relieved now that we've launched," Bounds said. "The pressure was much greater before today."
Bounds and his team aren't taking much time to re-group. The team plans to return to Poker Flat Research Range in 2010, as the University of Iowa is a collaborator for another launch scheduled at the range.
FOR MORE INFORMATION:
http://www.gi.alaska.edu/pfrr
http://delta.physics.uiowa.edu/~srb/
Source: University of Alaska Fairbanks
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nilbud - Feb 01, 2009
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