contrails


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contrails

A long trail of visible moisture left by an airplane as it flies at a high altitude through very cold air. The trails are formed by the condensation of water vapor in the exhaust gases leaving the engine. They appear at a slight distance behind the aircraft exhaust. Their longevity can vary from a fraction of a second to a few minutes. The minimum flight level at which these trails occur is called the MINTRA level, which meteorologists obtain from a tephigram. Also called vapor trails or exhaust trails.
References in periodicals archive ?
Thus, on Christmas day 1939, over two years before the publication of Flight to Arras, Longbottom issued a SECRET report titled "Condensation Trails at High Altitudes" which begins by explaining the major implication of contrails for air warfare: a contrail aids enemy defenders by betraying the position of an aircraft that might otherwise be invisible.
This is followed by a review of the major developments that made high altitude flight part of routine combat operations and led to the first recorded observation of contrails in combat, this coming during the Spanish Civil War, Europe's dress rehearsal for World War II.
During the day, contrails either can reflect heat back into space (the Albedo Effect) or trap heat below (the Greenhouse Effect).
But they all share a common element: They are true accounts, as told by Contrails readers.
Researchers from NASA's Langley Research Center presented evidence that contrails are contributing to global warming and causing local effects over areas with heavy air traffic.
And, what's more, Saturday's "failure" wasn't some obscure accident that will make Page 3; instead, the Columbia's contrail streaked the Texas sky, like a skywriter's lament, for all to see.
The event will give journalists and social media users an opportunity to learn more about scientific research being conducted on the effects of alternate fuels, including synthetic and biofuel formulations, on engine performance, emissions and aircraft-generated contrails at altitudes typically flown by commercial airliners.
In aeronautics, contrails are better known as what?
Over a nondescript channel, white contrails rear up like a wall.
Researchers said aircraft will be able to lessen their contributions to global warming by avoiding the places where the thinly shaped clouds contrails are produced.
The research found that aircraft contribute less to global warming by avoiding the places where the thinly shaped clouds, called contrails, are produced by them even if that means flying further and emitting more carbon dioxide.
He claims that his meteorological credentials as a former Fleet Air Arm pilot led him to conclude that the overhead aerial phenomena we were then actually witnessing were simply jet aircraft contrails.