However, an increasing frequency of occurrence of noctilucent clouds since the 19th century may be the result of climate change . An alpha-numeric classification is used to identify variations in physical appearance.
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In 1994, professor Gary Thomas of the University of Colorado at Boulder forecast that as the upper air cooled, beautiful noctilucent clouds _ common in polar latitudes _ would appear at southerly latitudes.
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Low-density ASW ( LDA ), also known as hyperquenched glassy water, may be responsible for noctilucent clouds on Earth and is usually formed by deposition of water vapor in cold or vacuum conditions.
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Research published in the journal " Geophysical Research Letters " in June 2009 suggests that noctilucent clouds observed following the Tunguska Event of 1908 are evidence that the impact was caused by a comet.
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At higher altitudes, NASA studied inducing noctilucent clouds in 1960 and 2009 . In 1984 satellites from three nations took part in an artificial cloud experiment as part of a study of solar winds and comets.
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This involved the intentional release of ballast water from the second and third stages which allowed scientists to investigate the nature of Earth's ionosphere, as well as noctilucent clouds and the behavior of ice in space.
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Tromp et al . also suggest that a transition to a hydrogen economy would result in an increase in the free hydrogen concentration of the atmosphere by 1 ppm, which would increase the number of noctilucent clouds.
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The peak PMSE height is slightly below the summer mesopause temperature minimum at 88 km, and above the noctilucent cloud ( NLC ) and / or polar mesospheric cloud ( PMC ) layer at 83 84 km.
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A second objective of both this mission and ballast water from the second and third stages which allowed scientists to investigate the nature of Earth's ionosphere, as well as noctilucent clouds and the behavior of ice in space.
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Kelly " et al . " ( 2009 ) contend that the impact was caused by a comet because of the sightings of noctilucent clouds following the impact, a phenomenon caused by massive amounts of water vapor in the upper atmosphere.
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