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pjust
Joined: 11 Jan 2001
Posts: 3
Location: Mahwah, NJ, USA |
Contrails over Bergen County NJ
 Thu Jan 11, 2001 5:09 pm
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On 1/11/01 between 7:40 and 8:35 AM, I observed 2 Separate Jet Aircraft flying north west over Bergen County New Jersey. Both jets were laying down Long Contrails. There were at least six other different contrails present in various states of diffusion. Before boarding my train I observed a school bus driver stop his bus (with kids in it) get out and take pictures of the criss crossed skies above Ramsey.
The trails were visible from Ramsey NJ, as I boarded a NJ Transit train all the way to Hoboken NJ, (my daily commute into NYC). As I was sitting on the left side of the south bound train I was able to see the trails throughout my entire commute. The trails were directly over my position at the Glen Rock NJ train station.
I observed 4 other Jet aircraft that were flying at lower altitudes then the 2 Jets leaving contrails. Twice, I observed both the "normal" jets and "contrail" jets at the same time and in the same space (albeit different altitudes). In both instances only the higher jets were leaving a trail.
Once my train pulled into the Hoboken Train station I could see the point of origin from the trail as originating from north east of Hoboken, across the Hudson river.
Therefore these trails must have been over northern Manhattan.
My question, besides what the hell is going on, is it possible that if two Jets are flying at the same time in the same atmospheric conditions, but different altitudes, only one would produce a trail?
[Edited 1 times, lastly by pjust on 01-11-2001] |
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Thermit
Joined: 08 Jul 2000
Posts: 3136
Location: Texas |
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Thu Jan 11, 2001 5:39 pm
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Hi pjust.
quote:
My question, besides what the hell is going on, is it possible that if two Jets are flying at the same time in the same atmospheric conditions, but different altitudes, only one would produce a trail?
Yes, that is certainly possible.
At different altitudes you will find varying temperatures. The temperature must be below a certain point for a contrail to form, even if the required moisture is present. The higher you go, obviously the colder it gets.
Even at the same altitude in the same atmospheric condition different types of engines can produce different contrailing properties due to the production of different amounts of moisture, however the differences shouldn't be radical (i.e. no trail at all vs. trails that last for hours). Also the same aircraft could appear to produce different trails, if, for example, one was increasing power, while the other was closer to gliding. This difference has been proposed as the reason for the differences seen in the photo below, however it is certainly debateable.
For how long can you remember seeing highly persistent trails (if that is actually what you are seeing) in your area?
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pjust
Joined: 11 Jan 2001
Posts: 3
Location: Mahwah, NJ, USA |
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Thu Jan 11, 2001 5:50 pm
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The "old" trails I first observed at 7:40
were till visible at 8:30 am but were sinking and spreading out faily wide. They were still discernable but would be overlooked had you not seen them earlier when they were more clearly defined. The "new" trails I saw being formed at 7:40 were still largely intact at 8:30.
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Thermit
Joined: 08 Jul 2000
Posts: 3136
Location: Texas |
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Thu Jan 11, 2001 6:17 pm
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How about on the scale of months and years? Have you ever observed these highly persistent trails before? |
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pjust
Joined: 11 Jan 2001
Posts: 3
Location: Mahwah, NJ, USA |
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Thu Jan 11, 2001 6:36 pm
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Oh, thats what you meant. I have never seen them before today in my area. The first and last time I saw contrails in a lingering crossing pattern was over central NJ about one and a half years ago. |
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LTC8K6
Joined: 20 Oct 2000
Posts: 267
Location: Tar Heel State |
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Thu Jan 11, 2001 6:43 pm
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That photo is a perfect example of perspective compression caused by telephoto lenses. Perspective compression causes distant objects to appear closer together than they really are. |
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LTC8K6
Joined: 20 Oct 2000
Posts: 267
Location: Tar Heel State |
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Thu Jan 11, 2001 6:48 pm
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http://www.sphoto.com/techinfo/phototech.html
"Moving up the focal length ladder, the 100mm can give you both macro and a very slight compression of perspective. 100mm and longer lenses also give you the capability to isolate objects in your composition. Landscape and scenic photography with lenses of 200mm and up will produce an effect called compression of apparent perspective. Compression of apparent perspective means that the scene becomes flattened and objects in the foreground seem to be closer than they actually are to objects in the background. This compression of the scene is not a normal perception of the human eye and can be used to advantage to produce some very dramatic looking images."
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Falcon
Joined: 04 Aug 2000
Posts: 87
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Sat Jan 13, 2001 1:55 am
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Yet another person with no aviation knowledge being put at risk of being "led down the garden path" by this Chemtrail garbage.
There is NO substance to these persistant rumours, let it go and get on with enjoying your lives! |
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