That eruption late Wednesday created a plume of ash that spread out across northern Europe at high altitudes, forcing aviation authorities to ground flights and close airports because of the risk of damage to aircraft, particularly the engines, from abrasive silicate particles.
Operating at about 25,000 feet they were waiting for the high-altitude force to reach the area.
Only snowfall, which starts in early autumn at such high altitudes, can force the rebels to withdraw, at least temporarily.
It was a typical workday on Friday for President Obama -- who went to Columbus, Ohio, to make his case, yet again, for his economic recovery bill -- except that much of the business was conducted at high altitude aboard Air Force One.
It was in fact the invasion of the crash-test dummies, mannequins designed to test high altitude parachutes, the air force declared in a detailed 231-page report which included photographs, film footage and original records and witness statements of the event at Roswell on the night of July 4, 1947.
The drone was designed to do for the Bundeswehr, Germany's armed forces, what the high altitude, long endurance surveillance drone Global Hawk does for the United States military.
Forecasting the effects of global changes on high altitude ecosystems requires an understanding of the long-term relationships between biota and forcing factors to identify resilience thresholds.
Russia says its air force is conducting "pinpoint" strikes, but footage and still images show it also used unguided bombs dropped from high altitude on numerous occasions.
High Altitude Pathology Institute.
High altitude means high alcohol content.
