Monday, June 17, 2013

"Scare people anomalies" - BBC

strange light the night sky over the European part of Russia, on Sunday night was a silvery cloud. These structures, which have long been known to scholars, now appeared unusually early, and may indicate a change in climate.

unusual glow and flicker of the atmosphere have been observed on the Sunday night of the many cities of the European part of Russia, and even beyond the Urals.

Observers reported strange wave-like structures in the sky of Karelia, Leningrad Oblast, Saratov Oblast, Tatarstan, Perm Krai, Chelyabinsk and Krasnoyarsk.

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are seen they were on the north side of the sky, and over time, depending on the place of observation, about an hour from the night, and almost before sunrise. A rare natural phenomenon – noctilucent clouds – those who do not sleep at night, given the opportunity for a long time to watch the night game atmosphere, residents of Chelyabinsk – recall the recent fall of the meteorite, and TV people – talk about another anomaly.

«Clear noctilucent clouds detected! Looked more closely – they are almost the entire northern half of the sky. Here and there on the climbs, and the southern half (east) “- the first reported observation of the phenomenon of amateur astronomy forum user lkmnbv.

After that, people began to report on the observation of clouds in Kondopoga in Chelyabinsk (from 2.10 to 2.40 local time), over the Urals and Siberia. “Today in Chelyabinsk watched chic noctilucent clouds, and TV broadcasters again screwed up, scare people anomalies” – wrote a resident of Chelyabinsk.

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«In Saratov (51 g N), something real is happening with the fields of noctilucent clouds! From 2 to 3 hours of the night. The city center, the brightness of the 5 balls out of 5. Structure – severe stripes parallel to the horizon “- said the astronomer, head of research projects observatory” Ka-Dar “Stanislav Short.

«These atmospheric education live at an altitude of 80 km – this is the border with space and light up the sun from the horizon when still see the stars in the sky” – he explained.

Noctilucent clouds are usually seen in the summer, in areas at latitude 50-70 degrees, at a low altitude above the horizon. Before, people would take them for UFOs, someone thought they were an omen or a sign of a change in weather emergency. For the first time, these clouds have been described in the June 1885 European astronomers who conducted the night observations in several European countries and in Russia. One of the reasons for the appearance of abundant silver clouds while scientists believe the eruption of Krakatoa in 1883.

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appearance of noctilucent clouds, a rare atmospheric phenomenon that was observed, in particular, after the fall of the Tunguska meteorite, has a correlation with the … ?

The clouds were observed in the summer of 1908 – after the fall of the taiga of the Tunguska meteorite. At an altitude of 75-90 km, where clouds are formed, the temperature is about minus 120 degrees Celsius. Therefore, we first have suggested that the cloud – the sun illuminated the horizon from the crystals of water ice.

Later this assumption is confirmed the observations from spacecraft.

Until 2007, when the space for the study of noctilucent clouds has been sent to the satellite NASA AIM, in the nature of their appearance much remains unclear. “It turned out that in the formation of noctilucent clouds play an important role meteoroids. Pieces of the collapsed cores of meteors are around that can be collected and crystallized water “- says Professor James Russell, head of mission AIM.

clouds appear in the summer due to the fact that during this period, the water molecules are actively transported from the lower to the upper layers of the atmosphere, where they meet with micro particles of cosmic origin.

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A hundred years ago, noctilucent clouds were observed only at high latitudes, and only in recent years, scientists have observed their gradual “drift” in the direction of the south. Some researchers believe that this is due to global climate change caused by increasing concentrations of methane, a greenhouse gas. “When methane rises above the atmosphere, it is oxidized during a complex series of reactions to form water vapor. This steam is then able to form crystals, which consist of noctilucent clouds, “- says Russell.

In 2013, observations of noctilucent clouds season started earlier than usual: “This season is different is that in the northern latitudes, it started a week earlier (May 13) previous periods observed apparatus AIM, – says Cora Randall, of the Laboratory of Atmospheric and Space Physics at the University of Colorado. – Perhaps this is generally the earliest clouds ever observed ».

Such an earlier occurrence of noctilucent clouds may be associated with the restructuring of the atmospheric layers on a planetary scale.

«Over half of the world from the high latitudes to noctilucent clouds are formed, strong winds in the southern part of the stratospheric circulation change the global picture. This year was more water vapor, which was raised high into the atmosphere, where they like to form noctilucent clouds, and the air was cooler there. All of this was a surprise to us. When we started the AIM, we were interested in clouds themselves. Now, however, they teach us cook interact with each other over long distances are different layers of the atmosphere, “- says Russell.

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