Observations of noctilucent clouds

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National Aeronautics and Space Administration; for sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Va. , [Washington]
Noctilucent cl
Statement[by] Ch. I. Villmann, editor.
SeriesNASA TT F-546, NASA technical translation ;, F-546.
ContributionsVillmann, Ch. I. 1923-
Classifications
LC ClassificationsTL507 .U745 no. 546
The Physical Object
Paginationvi, 153 p.
ID Numbers
Open LibraryOL4853272M
LC Control Number75602392

Observations of noctilucent clouds. [Washington] National Aeronautics and Space Administration; for sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Va. [] (OCoLC) Document Type: Book: All Authors / Contributors: Ch I Villmann. Table of Contents 1 Noctilucent Clouds.- Introduction.- How, When and Where Noctilucent Clouds Are Seen.- Amateur Observations.- CloudTypes.- Structure of the Upper Atmosphere.- 2 History.- Introduction.- The Discovery of the “Shining Night-Clouds”.- Measurements of Noctilucent Clouds.- The Middle Period of Noctilucent Cloud Research.- 3 Author: Michael Gadsden.

Noctilucent clouds, or night shining clouds, are tenuous cloud-like phenomena in the upper atmosphere of consist of ice crystals and are only visible during astronomical twilight.

Noctilucent roughly means "night shining" in are most often observed during the summer months from latitudes between 50° and 70° north and south of the iation: NLC/PMC. The observations of noctilucent clouds (NLC) from the La Ronge, Saskatchewan, Flight Service Station (° N ° W) during the years are presented.

Midlatitude noctilucent cloud observations by lidar Article (PDF Available) in Geophysical Research Letters 23(21) October with 76 Reads How we measure 'reads'. Noctilucent Clouds \\ PDF. Typical examples are illustrated in the book. Clouds looking like these in daytime would be classified as cirrostratus.

What sets noctilucent clouds apart is their occurrence in the middle of the night, their very obvious pale blue colour, and their disappearance into the dawn close to the onset of civil twilight when the Sun is 6° below the. Observations of noctilucent or "night-shining" clouds were first reported in the summer of The observations were made Observations of noctilucent clouds book northern Europe and Russia.

In the late ’s, it was proposed that the clouds had a connection with the volcano dust thrown into the Earth’s atmosphere by the eruption of Krakatoa in Indonesia in The book presents the results of the study of dynamic and spectral features of such a little-studied phenomenon as mesospheric noctilucent clouds (NLCs).

The results of the study of their dynamic and spectral characteristics are presented. Vdovichenko V.D., Kirienko G.A. Mesospheric noctilucent clouds. Problems and solutions. This banner text can have markup. web; books; video; audio; software; images; Toggle navigation.

Noctilucent clouds (NLCs) were observed from a midlatitude site (Logan, Utah) on the evenings of 22 and 23 June mountain daylight time. On both nights the clouds were seen for approximately an hour by experienced observers, and they were photographed. The NLC was also observed on the second evening for approximately an hour in the zenith with the Rayleigh-scatter lidar at the Atmospheric Cited by: The sunlight shining on noctilucent clouds has passed obliquely through the ozone layer.

As a result, a path length equivalent to several centimetres of ozone at atmospheric pressure is experienced by the light rays. Morphology of the clouds Observations over the last one hundred years have shown that noctilucent clouds appear almost.

In the century that has elapsed since systematic observations of noctilucent clouds began, many observational data have been recorded and discussed at length. From the very start of the period, hypotheses have been formed and, to the extent practical, by:   Optical observations of buoyancy waves in the terrestrial upper atmosphere have been greatly facilitated by ‘nature’s gifts’ of several vertically distinct airglow layers, alkali metal layers, and noctilucent clouds (NLC).

Some of the earliest evidence for atmospheric buoyancy waves was provided by wavelike deformations frequently observed during NLC displays. Noctilucent clouds (NLC) and strong polar mesosphere summer echoes (PMSE) appear at similar heights, similar latitudes and at about the same time of year.

To determine whether these two phenomena are related in detail, a visual and photographic search for NLC over the EISCAT radar site at Tromsö, Norway, was made on several nights in August when the VHP radar was observing in Cited by: The perfect incentive for keeping your head in the clouds, The Cloud Collector's Handbook is a whimsical guide to the wonders of the sky.

Throughout, author and cloud expert Gavin Pretor-Pinney catalogs a variety of clouds and gives readers points for spotting them and recording their finds/5(). Buy Noctilucent Clouds (Physics and Chemistry in Space) on FREE SHIPPING on qualified orders Noctilucent Clouds (Physics and Chemistry in Space): Gadsden, Michael, Schröder, Wilfried: : Books.

ISBN: OCLC Number: Description: ix, pages: illustrations ; 24 cm. Contents: 1 Noctilucent Clouds.- Introduction.- How, When and Where Noctilucent Clouds Are Seen.- Amateur Observations.- CloudTypes.- Structure of the Upper Atmosphere.- 2 History.- Introduction.- The Discovery of the "Shining.

The noctilucent cloud is wavy and blueish-white. The picture was taken when the sun was approximately 10 degrees below the horizon, but still shining on the noctilucent cloud. The clouds have been observed thousands of times in the northern hemisphere, but less than observations have been reported from the southern hemisphere.

Abstract Based on visual observations and photography by Soviet and American astronauts, as well as on color pictures painted aboard Voskhod-2, the solar corona, Fresnel reflection of the sun from the atmosphere of the earth and from comet Kohoutek, and noctilucent clouds on the night side of the earth are discussed and analyzed.

Noctilucent clouds (NLC’s) or polar mesospheric clouds (PMC’s) are found very high in the Earth's atmosphere. They are called Polar Mesospheric Clouds when they are viewed from space, and are referred to as noctilucent clouds when viewed by observers on lower clouds that are associated with weather, these clouds form at the very edge of space in the atmospheric layer called.

The site, which I first visited when working on my piece on the aurora and space weather, has featured observations of noctilucent clouds for some time and maintains a Noctilucent Cloud Gallery of photos submitted by readers.

The full gallery has photos dating back toand provides a good primer in what to look for if you decide to. A noctilucent cloud is silvery or bluish white and is typically visible on summer nights in high latitudes. In the early 21st century, because of increases in methane concentrations in the upper atmosphere, noctilucent clouds appeared with increasing frequency in lower latitudes.

Between the early s and the early s, methane concentrations at that altitude rose by 15 percent.

Details Observations of noctilucent clouds FB2

Noctilucent clouds (popularly referred to by the abbreviation “NLC”) are high atmosphere clouds which occur over summertime at mid latitude locations.

They form at very high altitudes – around 82 km above sea level – and are, thus, a quite separate phenomena from normal weather or tropospheric cloud. Book of Clouds is a haunting, masterfully wrought debut novel about a young woman adrift in Berlin, where a string of fateful encounters leads to romance, violence, and revelation.

Having escaped her overbearing family a continent away, Tatiana settles in Berlin and cultivates solitude while distancing herself from the city's past/5. Observing Noctilucent Clouds.

Description Observations of noctilucent clouds FB2

Visual observations of NLCs are fairly straight forward however you will need to remark on a number of key factors to make your observations worth while for data collection. Visual observers should record the altitude of a display along with its azimuth accompanied by brightness values and records of structure over.

Noctilucent clouds (NLCs) have been imaged during two nights in summer from northern Germany (Kühlungsborn, 54°N) and middle Norway (Trondheim, 64°N).

For the first time a horizontal resolution of 10 to 20 m at the altitude of the clouds (about 83 km) and a temporal resolution of about 1. Noctilucent clouds were first observed in by an amateur astronomer.

No observations of anything resembling noctilucent clouds before that time has ever been found. There is no lack of observations of other phenomena in the sky, so atmospheric scientists are fairly sure that the phenomenon is recent, although they are not sure why. Based on data gathered by Salyut-4, a study is made of noctilucent clouds.

The data were obtained via a four-channel near-infrared radiometer having interference filters of,and micron wavelengths.

For the micron wavelength channel, all brightness profiles of the horizon were found to have a secondary maximum or a plateau at the perigee of the line of sight at H = : O. Avaste, A. Alekseev, U. Veismann, Ch.

Villmann, P.

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Klimuk, I. Koksharov, A. Observing Noctilucent Clouds. Observation-For convenience, printed observing sheets are available for download at To be confirmed NLC, unlike the aurora, change fairly slowly during a night and observations should if possible, be made at 15 minute intervals, i.e.

on the hour, quarter past etc. What sets noctilucent clouds apart is their occurrence in the middle of the night, their very obvious pale blue colour, and their disappearance into the dawn close to the onset of civil twilight when the Sun is 6° below the horizon.

as being set apart from ordinary Noctilucent clouds were first recognized clouds in / and in a series of Brand: Springer Berlin Heidelberg.We present an analysis of systematic visual and photographic observations of noctilucent clouds seen from Lithuania in the years – The main trends in the noctilucent cloud occurrence frequency and the mean brightness are derived from statistical and correlation by: Polar mesospheric clouds (PMCs) are a diffuse scattering layer of water ice crystals near the summer polar mesopause.

Description. Observed from the ground, this phenomenon is known as noctilucent satellites, PMCs are most frequently observed above 70°–75° in latitude and have a season of 60 to 80 days duration centered about a peak which occurs about 20 days after the summer Altitude: 75, to 85, m, (, toft).