Jet planes leave trail file and another thing — glass blocks beta lpanes required to generate vitamin D too — so if you ware sitting in the sun in your car or behind a window you are not getting anything from it either. This may sound as a silly question, but, when a plane cruises, do all its engines have identical loads? Anonymous lesve. Moore; et al. Several clips from this show are available on youtube: The unfortunate thing about the

These regions of rotating flow are called vortices. Any sharp surface, such as the tip of a wing, can cause vortical flow in its wake if it is sufficiently large or the flow is sufficiently fast. On occasion, these trailing vortices may interact with one another. In one well-known example of this fact, the Crow Instability causes the vortices to develop symmetric sinusoidal oscillations and eventually to merge and form vortex rings behind the jet. This instability can be triggered by turbulence in the surrounding air or by local variation in air temperature or density, which may itself be the result of the stratification of the atmosphere.

When the contrails are visible and strong, it is possible to see the white streaks become wavy and then leave rings floating high in the sky, like smoke rings from a giant cigar. Recent research has suggested that the ice clouds contained in contrails cause greenhouse effects and contribute to global warming as part of the insulating blanket of moisture and gases in the atmosphere.

Researchers in this area seized on the opportunity presented on September 11 and 12 over the U. The complete cessation of commercial air traffic offered a control sky without contrails for use in quantifying the environmental effects of contrails.

You have free article s left. This is known as a distrail short for "dissipation trail". The plane's warm engine exhaust and enhanced vertical mixing in the aircraft's wake can cause existing cloud droplets to evaporate. If the cloud is sufficiently thin, such processes can yield a cloud-free corridor in an otherwise solid cloud layer. Clouds Jet Planes Leave Trail Guide form when invisible water vapor H 2 O in gas phase condenses into microscopic water droplets H 2 O in liquid phase or into microscopic ice crystals H 2 O in solid phase.

This may happen when air with a high proportion of gaseous water cools. A distrail forms when the heat of engine exhaust evaporates the liquid water droplets in a cloud, turning them back into invisible, gaseous water vapor.

Distrails also may arise as a result of enhanced mixing entrainment of drier air immediately above or below a thin cloud layer following passage of an aircraft through the cloud, as shown in the second image below:. Airliner contrails, some new, some old, dispersed by wind shear.

Distrail a narrow line of clearance produced by a passing airplane, here produced in a patch of thin cirrostratus. Iridescent contrails from a Boeing , when the sun shines through a group of similarly sized water droplets at a relatively small angle. An Airbus A of Lufthansa produces contrails.

The Antonov has distinctive sextuple vapor trails. From Wikipedia, the free encyclopedia. For other uses, see Vapor Trail disambiguation. Not to be confused with Chemtrail conspiracy theory. For other uses, see Contrail disambiguation. Long, thin artificial clouds that sometimes form behind aircraft. Play media. Main article: Wingtip vortices. Multiple contrails above Nova Scotia.

A contrail over southwest Virginia. B bombers over Europe, Chemtrail conspiracy theory Cirrus cloud Cloud chamber — particle detector that works on similar principle Environmental impact of aviation Fallstreak hole Global dimming Ship tracks Skywriting Space jellyfish Twomey effect.

Retrieved Jet Planes Leave Trail Tool 13 October Retrieved 17 April The Weather Network. Pelmorex Media. Retrieved 24 March PMID S2CID Archived from the original on 8 April Moore; et al. Bibcode : Natur. Accessed: 8 July Geophysical Research Letters. Bibcode : GeoRL.. Bibcode : AtmEn.. PMC New Scientist. Atmospheric Chemistry and Physics. Bibcode : ACP Sometimes they vent of stuff during the course of a rocket launch.

Do rockets go straight up as your arrow indicates. Did this rocket go straight up? Where is your proof that this rocket went straingt up? What is the operating temperature of rocket exhaust during the various stages of assent? What are the differences in temperature and humidy that enable you to lable the photo as a wet or dry zone. Do you have the met data from this location for the different layers of atmoshpere? You have left me with way more question than you have answered.

Can you please help me understand? Your photo of the fifth contrail above could actually also be from another jet that is flying at a higher altitude than the jet we see.

We cannot see this second jet because it is higher and smaller than this big jet and is being obscured by the big jet. Is this not possible? This is a bad photo. Without a good photo this is a bad argument. Which is what this post is about — that there are some regions of air that are different from other regions of air. Contrails form in those regions. Both produce lots of water. I label the regions as wet and dry based on where the contrail shows up, the description from the rocket scientist.

Since the rocket was ging into orbit it would not be going exactly straight up all the way, but not too far off. It certainly started straight up. It does not change the argument that some planes operate the APU in flight, and this creates an additional contrail. Using this argument, and looking at the second photo from the top, are those two planes at exactly the same altitude? Perhaps the plane on the right is flying in a different layer an that is why we a re not seeing the formation of a contrail.

Do you have the actual measured flight altitudes of these two aircraft? Is one aircraft ahead of the other? Without a line of reference or actual flight altitude data, this is a bad photo should not be used in this aurgument.

The photo shows two planes that were part of a study into the formation of contrails. They were deliberately flown together at the same altitude. One made contrails, one did not. Photo notes:. Shown below is a photo taken from the research aircraft Falcon of the German Aerospace Center Deutsches Zentrum fh r Luft- und Raumfahrt DLR at about flight level 33, feet of an Airbus A with contrails left and a Boeing without contrails right. This illustrates a scientific effort to evaluate the effects of different engine characteristics on contrail formation.

The point here is that different engines produce different contrails. This is established science which nobody disagrees with although not everyone is aware of it. The photo is simply a demonstration. When it rains the rain is wet and it is directly outside the cloud. This effect of the wet being on the outside of the cloud can continue all the way to the ground.

Due to different atmospheric condidtions sometimes this effect only goes a short way before it evaporates again. Do you have humidity measurements of that particular cloud that it is indeed dry where the arrow is pointing. Without evidence, this photo is a bad example and should not be used in this argument. My, you certainly have demanding standards of photos. The clouds are in a layer. Below the base of the clouds there are no clouds forming.

Obviously there is something different in the air above and below this level. The precise figures of humidity are not important. When trails form they are DRY. You mean, because of the variable ambient humidity rain can sometimes evaporate away. Do you have humidity measurements of that particular cloud that it is indeed dry where the arrow is pointing? Unless you claim it to be false. It is quite apparent to anyone qualified in these matters that you know very little, as you admit.

Before those of us who are qualified were indeed qualified, we at least knew enough to know not to do so — at least until we knew a modicum of the subject. After reading the very first article and looking at the pictures I had questions, so I asked them. I Jet Planes Leave Trail Yours learned to question things by reading your posts. Getting back to your interesting pics above, Uncinus, I especially liked the near-vertical rocket trail picked out as it passed through a succession of wet layers.

I suggest its a succession because of its very raggedness. That raggedness is a physical readout of the lateral motions in the layers; they are sliding sideways to each other, for what you see is the result of what happened. This is a fascinating website you have here. Very interesting and enlightening.

I tend to think of myself as a generally pretty fellow that is pretty scientific. So I have some questions for you. Radar beams do not take curved paths as I remember from school. I studied lasers at the college level for a while and I can tell you that energy on the shorter end of the frequency certainly does not take a curved path. So doubtful radar beams do. What that means then is that the pilot is deliberately veering to the side.

It does not look like ice crystals or water vapor. It looks more like a trail of some sort of fine aerosol powder which is being dispersed in a stream.

I am also a pilot, flying jets at all altitudes all over the country. With a few exceptions we can fly wherever or however we want.

If I wanted to go up over New York City and fly circles at feet for two hours I could ask for that and i imagine I would be allowed to. If I wanted to go spell my name over Kansas I could certainly do that. Not that I would since it costs my compamy money to go waste fuel. Jets primarily navigate by a mixed use of GPS and ground based sources.

We also usually use a predetermined matrix of published routes and procedures arrivals and departures as well as approaches but ther is nothing that says we must stay on those routes and ATC on a daily basis takes us off routes, gives us shortcuts, reroutes us etc. There is no such thing. And as far as curving routes goes- yes, we aim to fly as straight a route as possible but sometimes you have to have bends in the route for a number of reasons.

We are not guided by radar beams- we are tracked by them not much longer though. Hi Uncinus, and thanks for explaining airplane routes. Much appreciated. Actually that was me who explained the routes, although I sure uncinus could have told you the same. Suggesting that we are the ones lying is ridiculous. Yet now the sky is painted white from only a few certain unmarked aircraft. Yes contrails can last a while but when you are watching from the ground this systematic griding of the sky then watch the trail fall like a veil towards the ground and start to sting your skin and eyes you are left with no option but to believe the conspiracy.

If it is not chem. Trails then it means the airlines are causing very nasty pollution that carries the same stigma as chem. The older engines actually made fewer contrails as they were less efficient. The more efficiently an engine burns fuel, the more water it produces. Why not do a little science.

Now if something were being sprayed up there, how long do you think it would take to reach the ground? Do another experiment. You have noticed that when you watch this activity, then your eyes seem to sting. One wonders why millions of people are not simultaneously complaining of stinging eyes? Is it just you? Try this: go outside and pretend a plane is spraying. Stare up at the sky for as long as you normally do. See if your eyes start to sting from the light and exposure to the elements.

Compare that to your past experience. Click on the planes heading from your area. You see a lot of planes coming from Europe. Match that with what you see. Six to eight hours before it got stingy and that was long after they finished the grid and the trails had become widespread.

You keep referring to high altitude spraying; I have noticed two levels that alleged chem. Trails are formed. The lowest being similar in height to commercial aircraft such as easy jet approaching Edinburgh airport, now I am not a pilot so I do not know what the norm approach height is but no doubt as you are a pilot you will know.

I noticed you side stepped the pollution aircraft distribute lol. Now as I see it the argument is not about the existence of contrails. It is the additives we believe that are added to the contrail thus we now have chem. Then this chem. Trail is sprayed across an area in a manner that is outside the norm for that area defiantly leaves a big question mark that no real given answer is forthcoming.

The use of weather conditions as an answer would suffice if it was normal for aircraft behavioral patterns of this nature in the said area. But when you have an influx of aircraft into an area on top of your normal traffic and are the only ones leaving contrails especially in a well recognized pattern then questions should be asked. As for the engine reply sorry but that holds no water lol.

Remember that trans-atlantic jets can be times the size of local jets. So could be times as high. Got any photos to illustrate what you claim? A percentage of the fuel is not water. It burns with oxygen to produce water. A gallon of fuel produces more than a gallon of water.

Modern engines produce more than old engine, as they burn more efficiently. However the primary reasons for trails is the atmospheric conditions at that altitude. This can vary in a few hundred feet, and one the biggest cause of trails vs. Note that most people never notice them, just like you used not to notice them. Possibly the RAF changed where it conducts test operations. Weigh the evidence. Why are the Germans studying contrails??

Could it be they are putting poisonus gases in the mixture and we are all being poisioned as the Illuminati claims they will do??!! They study contrails because contrails can affect the climate by altering the amount of cirrus cloud cover. I like this video of a concord breaking the sound barrier, it looks to be making a nice big contrail as well. This is just a mistification. You think I am on the payroll too? Also do enlighten us what you mean by mistification.

I like to keep things scientific. I like the firmament of empirical evidence on which to place my flag of faith. Some of you have explained what contrails are to death here, and that is actually awesome for a guy like me. That being said, how can anyone here disprove that though contrails are water vapor, some could be chemtrails that inherit the same properties?

Also, in regards to the Chemtrail theory: Why, if they do exist, does their intent have to be about affecting a population?

Why does it all have to be so nefarious? But the real question is why you would suspect such a thing. Conspiracy theories are at the extreme of this condition. But then so are reasonably grounded hypotheses. Seeing things and wondering what could be- the imagination often leans towards the sexier options. A governing body might do all they could to control harmful, intrusive factors in such a region, including the weather, if they had the means at their disposal.

You pick a theory, that if it were true would almost certainly have a Jet Planes Leave A White Trail Behind Them Because Theorem vast amount of evidence to support it, and yet there is none. In this case absence of evidence is actually evidence of absence. And why would they be secret about it? But it helps if the speculation is not entirely at odds with observed reality. I was just curious enough to pose a question on this site, which was very enlightening!

OK, why is anything kept secret? Potential blowback has been the reason for secrets throughout history. I bow to your superior knowledge of this. You asked me to speculate, so I did.

Suggestion without evidence; the formulation of ideas outside the senses is called imagination, which is no stranger to science either. I posed a question: With everything said in this chat, could chemtrails be? You answered it the best you could. The rest of this is has turned into a metaphorical Contrail thats starting to obfuscate the initial question.

There have been lots of papers and discussions on how to do such a thing although none involve secret spraying. And if they do it in the future, then there is every indication that it will be quite open. I can only see that every day they cover HUGE part of the sky.

So no more clear skies, no more proper sun light. It influences sex organs and bodily development. It inhibits the excess production of hormones by other endocrine glands and can retard the growth of both malignant and benign tumours. The pineal secretes melatonin, seratonin, pinealin, lysine vasopressin, norepinephrine, acetylcholine, and histamine. These substances have many, many functions — including helping to regulate blood sugar levels, influencing adrenal hormones, protecting the pancreas from oxidative damage, and helping to control fluid retention.

Scientists have not yet discovered all there is to know about the pineal. Artificial, indoor lighting provides only a small portion of the wavelengths of light that the sun does. The missing wavelengths make a difference to our health. I live in London and the skies are always covered. The only time when there were no trails was when the volcano in Iceland erupted. I could see the difference in my mood. It was so natural.

So I was thinking about how sunlight is connected to the way we perceive life. I was thinking about alternative energy sources. I was thinking about the people of the power elite and how they perceive things, their values, their goal in life etc… I was also thinking how Internet gives us the possibility to share experience and teach each other so quickly.

I was also thinking what the power elite people were thinking about that. I was thinking about the media and how it influences us. I was thinking about how people are stuck to their TVs and have lost touch with themselves and nature. I was thinking how easy is to control these people….. Unfortunately it does not really stand up to scrutiny.

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