Эпизодические Лунные Явления (Transient Lunar Phenomena)

Автор slipstream, 29.06.2007 01:14:57

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ЦитатаЗагадочные процессы на Луне можно объяснить газами
28.06.07, Чт, 18:39, Мск

Профессор астрономии Колумбийского университета Эрлин Кроттс (Arlin Crotts), предложил гипотезу, способную объяснить природу загадочных вспышек на Луне - так называемых быстропротекающих процессов на поверхности Луны (Transient Lunar Phenomena, TLP). Процессы такого рода, представляющиеся земным наблюдателям в виде локальных и кратковременных (обычно около нескольких минут) изменений яркости или других оптических характеристик участков лунной поверхности размером в несколько километров, наблюдались на протяжении всей истории инструментальных наблюдений спутника Земли - в частности, советским астрономом Козыревым.

По мнению профессора Кроттса, ему удалось показать наличие убедительной корреляции характеристик процессов выходов на поверхность Луны газов, и TLP. Явления дегазации наблюдались с орбитального модуля пилотируемого корабля «Аполлон-15» в 1971 году, а также автоматическим лунным зондом Lunar Prospector в 1998 году. Ключевым компонентом газов, выделяемых до сих пор недрами Луны, является газ радон. Это может означать, что свечение (и изменение оптических свойств) вызывается электрическими разрядами, вызывающими свечение газовых облаков.

Результаты анализа позволили проф. Кроттсу провести селекцию имеющихся сообщений о наблюдении TLP и выделить из них те, которые могут быть связаны с процессами выделения газов лунной поверхностью.

Как сообщает Physorg, в настоящее время в обсерватории Серра-Тололо в Чили идет монтаж автоматической камеры, предназначенной специально для изучения TLP. Камера будет получать изображения Луны раз в несколько секунд, что позволит организовать мониторинг быстропротекающих явлений и значительно точнее локализовать их очаги на поверхности Луны.


исходное сообщение

ЦитатаAstronomer Offers New Theory Into 400-year-old Lunar Mystery
Source: by David Poratta, Columbia University
Published: 15:12 EST, June 27, 2007

Image of TLP taken in 1953 courtesy of Columbias Department of Astronomy. The TLP is the small bright spot in the center of the image.

Columbia astronomy professor Arlin Crotts thinks he has solved a 400-year-old mystery: the origin of strange optical flashes often reported as appearing on the moon's surface.

Transient Lunar Phenomena (TLPs), in which the lunar surface reportedly changes in brightness, blurriness or color, have been photographed and observed by thousands of astronomers over the centuries. Yet explanations of why they occur and even their reality as true lunar phenomena have been hotly debated. The TLPs typically cover a space of a few kilometers and last for several minutes.

Crotts has uncovered a strong statistical relationship between TLPs and so-called outgassing events on the lunar surface. Outgassing occurs when gases trapped beneath a moon or planet are released and, if only briefly, become part of the object's atmosphere. A key component of this gas is radon.

"People over the years have attributed TLPs to all sorts of effects: turbulence in Earth's atmosphere, visual physiological effects, atmospheric smearing of light like a prism, and even psychological effects like hysteria or planted suggestion" says Crotts, "but TLPs correlate strongly with radon gas leaking from the moon. No earth-bound effect can fake that."

To arrive at his theory, Crotts correlated TLPs with known gas outbursts from the lunar surface as seen by several spacecraft, particularly NASA's Apollo 15 mission in 1971 and the robotic Lunar Prospector in 1998. What he discovered was a remarkable similarity in the pattern of outgassing event locations recorded by spacecraft across the face of the moon and reported TLP sites.

The pattern was further strengthened after Crotts performed a statistical test to rid the sample list of false reports and one time events that might not represent true outgassing sources. "The result," says Crotts "shows that some lunar event sites that were the focus of great observer excitement over recent decades disappeared from the more highly refined list of TLP sites." Crotts used two catalogs of such sightings amassed and edited three decades ago by now retired astronomers Barbara Middlehurst and Winifred Cameron.

Crotts says this research might lead to optical imaging of the lunar surface that could monitor how, when and where gas escapes from the moon. While the exact composition of this gas is largely unknown, he explains, hints from previous measurements indicate that it might contain substances beneficial for future moon explorations, especially water.

Until now, Crotts says two factors have worked against researchers solving the mystery of TLPs. Historically, outgassing has often been discussed by scientists, but many have considered the moon volcanically dead despite moonquakes and episodes of gas, such as argon, observed coming from the lunar surface. Another deterrent to researchers is the daunting volume of visual data associated with TLPs – a fact that plays to Crotts' particular research interest and skills.

Along with collaborators Professors Paul Hickson from the University of British Columbia, and Thomas Pfrommer and Cameron Hummels of Columbia, Crotts recently built the robotic camera at Cerro Tololo Inter-American Observatory in northern Chile. It will automatically scan the moon for TLPs every few seconds and produce an unbiased map of the distribution, free of potentially flawed sightings due to human error, poor equipment, or improperly recorded observations that have dominated TLP studies until now. The scientists are planning even more monitors and hope they will establish with much greater accuracy the exact locations of gas leaks on the moon.

Crotts says improved TLP maps are already pointing to intriguing features on the lunar surface, and he is currently preparing a separate article on that subject.


у NASA кстати уже есть похожая программа наблюдений, только без особой направленности на lunar transient phenomena