#manicouagan

[bobmorane]

The theater, the dream, the battlefield.

[ahmerinam]

Rivière Godbout by mgirard011 https://flic.kr/p/2nA1iVH

[if-you-fan-a-fire]

1) Adélard Chabot préparant une banique (mélange de farine, d'eau, de sel et d'une cuillerée à soupe de poudre à pâte) à même le sac de farine. E6,S9,P79

2) Adélard Chabot, trappeur, indique le trou de ventilation du camp et Roméo Delarosbil en soulevant la toile qui recouvrait l'abri lorsque nous l'avons découvert, nous fait voir une toiture de rondins calfeutrée de mousse et aussi d'écorce de bouleau. Le tout recouvert de la toile. E6,S9,P470

3) Adémar Martin et Jos. Labbé en pourparler de vente d'une peau de renard avec Félix Poitras, trappeur du « Ruisseau vert ». Scène typique montagnaise devant le cabanage rond, rivière Manicouagan (1934). E6,S9,P100

All photos taken by Paul Provencher, Fonds Ministère de la Culture et des Communications, possibly all in 1934 but not provided or printed until 1939.   

[earthstory]

Aurora and airglow over Manicouagan

Sited on the hard metamorphic rocks of the Canadian Shield, the circle in the photo snapped from the Space Station is one of the largest and oldest well preserved impact craters on Earth, with a 45 mile diameter (about70km) and an age of roughly 210 million years. The cracks radiating out from the rim testify to the power of the shockwaves rippling out from the asteroid's impact. The lake filled ring in the picture is one of several ring circular ripples in the rock, like a pond when a stone is thrown in. The entire crater estimated to be 100 km across. Along with the Richat Structure, it is one of Earth's most recognisable features from orbit.

The central peak is more resistant to erosion, being made of hard metamorphic rocks excavated from below and covered in impact melt and shatter cones. These hard rocks, despite some glacial erosion, have preserved a clear record of the complex impact structures. Scientists have therefore used it to understand crater formation processes of and as an analogue for similar craters on other planets.

Some suspect it may be linked to craters of a similar age elsewhere, resulting from a multiple impact event, like comet Shoemaker Levy 9's on Jupiter in the 1990's. Other suspects include Rochechouart crater in France, Saint Martin in Manitoba, Obolon crater in the Ukraine, and Red Wing crater in North Dakota. Linking up the chain with plate tectonic movements is tricky, but if true then a larger asteroid must have broken up and showered the Earth.

Unlike the Chicxulub impact off Mexico 65 million years ago, its fall was not associated with a mass extinction, demonstrating that it is not an inevitable consequence of meteorite impacts. The impactor is estimated to have been 5km across. If a much larger bolide did split into pieces, with some of them hitting Earth, then the dinosaurs may have gotten a lucky extended lease of life, lasting another 140 million years until the end cretaceous.

Here the feature is seen with a beautiful backdrop of aurora borealis caused by atoms excited by the solar wind, accompanied by another atmospheric electrical phenomenon called airglow. Unlike the aurora, which is focussed towards the poles by Earth's magnetic field, it can be seen from anywhere on Earth with luck and a dark sky or long exposure photo. Both phenomena arise from excited atmospheric atoms, but with different solar sources for the excitation energy. Like aurorae, airglow can be patchy and shift on a scale of minutes across the night sky. It is also present during the day but hidden in the glare.

Aurorae are due to high speed collisions with the high energy particles in the solar wind, usually during a coronal mass ejection that is pointed towards our planet and funnelled down our world's field lines. Airglow arises from high energy components of ordinary sunlight, in this case short wave ultraviolet and X-Rays. Several mechanisms combine in the lower reaches of space to produce this glow.

Between 80 and 100 Km up from the surface, oxygen atoms get chemically excited and ionised (the electrons are stripped off from the nuclei by the energy). They then react with hydroxyl molecules (OH) to form water, or recombine into O2 and start to glow green from both chemically stimulated energy and the decay of those atoms excited by cosmic rays (just once in my life I think I've had the blue flash of Cherenkov radiation in one eye reported by astronauts). They only occur at high altitude because lower down the nitrogen in the atmosphere quenches the reaction. Other types of atom also recombine to contribute to the effect, such as nitrogen and oxygen forming nitric oxide (NO), emitting a photon of light as they do so.

It was first identified by the Swede Angstrom in 1868, and subsequent laboratory studies have shown the chemical pathways that create the light as an energetic by product of the photochemical reactions. It limits the sensitivity of ground based telescopes at visible wavelengths, and is one of the reasons space telescopes are so useful to astronomers, as they can see faint objects normally masked by airglow. It usually appears bluish green, and seems brightest about ten degrees above the horizon. Only part of the layer of air that forms our bubble glows, too high up and the atoms are too tenuous to combine, too low and their density means that the energy is dissipated by collisions rather than photochemical reactions.

Loz

Image credit: NASA

http://go.nasa.gov/2b5K0eQ http://www.universetoday.com/36037/the-manicouagan-crater/ http://bit.ly/2aVLshD

[lifeitsanadventure-blog]

Звездная рана Земли: ударный кратер Маникуаган в Канаде

http://popular-astronomy.ru/post/145501674994

Столкновение с 5-километровым астероидом, создавшем эту 100-километровую структуру, произошло около 210 миллионов лет назад.

Фото сделанное астронавтом Тимоти Пиком, с борта МКС.

[earthstory]

Manicouagan Impact Crater, Quebec, Canada.

This is one of the largest and oldest well preserved impact craters on Earth, with a 45 mile diameter (about70km) and an age of roughly 210 million years. The cracks radiating out from the rim testify to the power of the shockwaves rippling out from the asteroid's impact. The lake filled ring in the picture is one of several ring circular ripples in the rock, like a pond when a stone is thrown in. The entire crater estimated to be 100 km across. Along with the Richat Structure, it is one of Earth's most recognisable features from orbit.

The central peak is more resistant to erosion, being made of hard metamorphic rocks excavated from below and covered in impact melt and shatter cones. These hard rocks, despite some glacial erosion, have preserved a clear record of the complex impact structures. Scientists have therefore used it to understand crater formation processes of and as an analogue for similar craters on other planets.

Some suspect it may be linked to craters of a similar age elsewhere, resulting from a multiple impact event, like comet Shoemaker Levy 9's on Jupiter in the 1990's. Other suspects include Rochechouart crater in France, Saint Martin in Manitoba, Obolon crater in the Ukraine, and Red Wing crater in North Dakota. Linking up the chain with plate tectonic movements is tricky, but if true then a larger asteroid must have broken up and showered the Earth.

Unlike the Chicxulub impact off Mexico 65 million years ago, its fall was not associated with a mass extinction, demonstrating that it is not an inevitable consequence of meteorite impacts. The impactor is estimated to have been 5km across. If a much larger bolide did split into pieces, with some of them hitting Earth, then the dinosaurs may have gotten a lucky extended lease of life, lasting another 140 million years until the end cretaceous.

Loz

Image credit: NASA, STS 9 (1983)

http://www.lpi.usra.edu/publications/slidesets/geology/sgeo/slide_18.html

http://www.universetoday.com/36037/the-manicouagan-crater/

[iheartvelma]

The Daniel-Johnson hydroelectricity dam, formerly known as Manic-5, on Lake Manicouagan, Quebec.

Its highest point is 702ft tall, about 1.5x the height of the Great Pyramid at Giza, it’s 4,311ft long and was built with 2,900,000 cubic feet of concrete, making it the largest dam of its kind in the world. Power from the dam supplies not only Quebecers’ needs, but is sold to neighboring US states. 

The Manicouagan reservoir is an annular lake formed from a meteor impact crater with a 45-mile diameter; it’s the 6th largest meteor crater in the world. The central island’s tallest peak is called Mount Babel. 

The ring shape seen today is the result of geoengineering to re-flood valleys and connect formerly separate arcs of the crater lake; the last image above shows the lake boundaries in 1962. 

[incomprehensible-reality-blog]

Кратер Маникуаган - ударный кратер в це

http://popular-astronomy.ru/post/99477769499

Кратер Маникуаган - ударный кратер в центральной части провинции Кwebек, Канада, который сформировался в результате столкновения с астероидом диаметром 5 км. Удар астероида создал кратер около 100 км в диаметре, но в процессе эрозии и отложения осадочных пород видимый размер уменьшился до 71 км. Это пятый по величине известный кратер на Земле. Предполагается, что гора Вавилон является центральным пиком кратера. В настоящее время в кратере располагается озеро Маникуаган. Снимок сделан с МКС.