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Date: 15 Jun 2003 20:39 (UTC)no subject
Date: 15 Jun 2003 21:08 (UTC)no subject
Date: 15 Jun 2003 21:30 (UTC)no subject
Date: 15 Jun 2003 22:07 (UTC)no subject
Date: 15 Jun 2003 22:21 (UTC)Paging Mr. Lenin
Date: 15 Jun 2003 21:31 (UTC)no subject
Date: 15 Jun 2003 21:55 (UTC)no subject
Date: 17 Jun 2003 07:27 (UTC)no subject
Date: 15 Jun 2003 20:42 (UTC)Oi, bartender! 8 pints - for the fruitbat!
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Date: 15 Jun 2003 21:43 (UTC)I regret to report that in the United States, there is a growing contingent of people who think that such contrails are the government or aliens poisoning humanity. I hope it is not true of your lovely country.
The word "chemtrails", the term for this, now garners more than 23,500 hits in Google.
===|==============/ Level Head
no subject
Date: 15 Jun 2003 22:10 (UTC)Did you see the chemtrails in yesterday's noctoluminescent clouds APOD?
Re:
Date: 15 Jun 2003 22:39 (UTC)I am close to a missile launch facility -- some of the evening launches are spectacular!
===|==============/ Level Head
no subject
Date: 15 Jun 2003 22:30 (UTC)Re:
Date: 15 Jun 2003 22:50 (UTC)The the soot particles in jet exhaust give the water vapor something to form on, which is in rare supply in the high troposphere. Also, the water vapor itself is coming from the jet exhaust -- it is a significant product of combustion.
No, of course it's not dangerous -- but a four engine jet such as a 747 leaves a different contrail shape from twin such as a 757 or 767, and you can often make out the individual engine trails before they merge. It's not from the wings (though the shape is very much influenced by the after effect of airflow over the wings).
Some studies show a very small climate change caused by the contrails themselves.
===|==============/ Level Head
no subject
Date: 15 Jun 2003 23:12 (UTC)Re:
Date: 15 Jun 2003 23:23 (UTC)That's an interesting process to watch, and very pleasant -- but the resulting clouds are not long lasting.
The contrails/vapor trails that cross the sky at altitude are exhaust-driven (and airflow-shaped) from everything that I have observed and read on the topic.
===|==============/ Level Head
no subject
Date: 15 Jun 2003 23:31 (UTC)no subject
Date: 16 Jun 2003 00:13 (UTC)no subject
Date: 16 Jun 2003 00:20 (UTC)no subject
Date: 16 Jun 2003 08:10 (UTC)Scott (Not a meteorologist) Kellogg
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Date: 16 Jun 2003 09:32 (UTC)As a general rule, the faster the aircraft is flying, the less severe the wing vortices are. The FAA is only really concerned about them when the heavy aircraft are low and slow, briefly after takeoff and for some time on final approach.
There is always some tip votice activity -- you may have seen a number of recent aircraft with "winglets" on the ends of the wings to squeeze a bit more out of this wasted energy -- but it is less dramatic, has a slower rotational speed, and stays around for a shorter period of time at cruise altitude.
It is possible to get "squeeze clouds" at altitude, but the conditions that support it are much more rare. Contrails, however, are very common.
===|==============/ Level Head
no subject
Date: 16 Jun 2003 08:05 (UTC)Wonderful Book! :D
Scott
Huh?
Date: 16 Jun 2003 11:38 (UTC)Re: Huh?
Date: 16 Jun 2003 16:27 (UTC)8)