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Perlan project - high wave flights
I wonder if these guys have fireproof flying suits.
See: http://www.sciencedaily.com/releases...1018075220.htm Quote from article: "Previous observations near the Andes Mountains in Peru had found that the atmosphere directly above some peaks was approximately 100 Kelvin [100 degrees Celsius; 200 degrees Fahrenheit] hotter than in nearby regions and that the difference occasionally reached as much as 400 Kelvin [400 degrees Celsius; 700 degrees Fahrenheit]. " Bill Daniels |
#2
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Perlan project - high wave flights
Quite interesting, but I do not think the article leads to such =
conclusion. Think about it: several types of aircraft have been flying = very high above mountain peaks in the last half century without bursting = into flames. If you go still higher, temperatures rise naturally up to about 800 = Kelvin in the Thermosphere. You run no risk of burning, though: the air = density by then is so low that any heat gained from collision with air = molecules cannot even offset the heat lost to outer space through = radiation. The (accoustically generated) temperature spikes theorised in = the article are therefore not so exceptional when viewed in context. I suppose the Perlan people need to be well dressed, indeed, but not = against the heat. F.A. |
#3
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Perlan project - high wave flights
"Francisco De Almeida" wrote in message ... Quite interesting, but I do not think the article leads to such = conclusion. Think about it: several types of aircraft have been flying = very high above mountain peaks in the last half century without bursting = into flames. If you go still higher, temperatures rise naturally up to about 800 = Kelvin in the Thermosphere. You run no risk of burning, though: the air = density by then is so low that any heat gained from collision with air = molecules cannot even offset the heat lost to outer space through = radiation. The (accoustically generated) temperature spikes theorised in = the article are therefore not so exceptional when viewed in context. I suppose the Perlan people need to be well dressed, indeed, but not = against the heat. F.A. You're right, of course. My posting was just a bit tongue in cheek. The first scan of the abstract didn't make clear that the temperature spikes were in the thermosphere (150 Km or so above the stratosphere) but a more careful reading of the body did. What IS interesting is that a phenomenon with roots in orographic turbulence reaches this far above the earth's surface. Oh what we don't know! Bill Daniels |
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