APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

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APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by APOD Robot » Thu Jun 27, 2013 4:22 am

Image Noctilucent Clouds over Moscow

Explanation: This panoramic night scene from June 8 looks out across a Moscow skyline from atop the main building of Lomonosov Moscow State University. Shining in the darkened sky above are widespread noctilucent clouds. From the edge of space, about 80 kilometers above Earth's surface, the icy clouds can still reflect sunlight even though the Sun itself is below the horizon as seen from the ground. Usually spotted at high latitudes in summer months the diaphanous apparitions, also known as polar mesospheric clouds, have come early this season. The seasonal clouds are understood to form as water vapor driven into the cold upper atmosphere condenses on the fine dust particles supplied by meteor smoke (debris left by disintegrating meteors) or volcanic ash. Their early start this year may be connected to changing global circulation patterns in the lower atmosphere. During this northern summer, NASA's AIM mission provides daily projections of the noctilucent clouds as seen from space.

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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by owlice » Thu Jun 27, 2013 4:30 am

I've emailed the editors about the errors.
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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by fausto.lubatti » Thu Jun 27, 2013 8:24 am

Wonderful shot!

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Say:"diaphanous apparitions" 3 times fast.

Post by neufer » Thu Jun 27, 2013 11:14 am

http://en.wikipedia.org/wiki/Mikhail_Lomonosov wrote:
[img3="Diagrams from Mikhail Lomonosov's "The Appearance of Venus On The Sun, Observed At The St. Petersburg Imperial Academy Of Sciences On May 26, 1761""]http://upload.wikimedia.org/wikipedia/c ... an_Fig.jpg[/img3]
<<Mikhail Vasilyevich Lomonosov (Russian: Михаи́л Васи́льевич Ломоно́сов; November 19 1711 – April 15 1765) was a Russian polymath, scientist and writer, who made important contributions to literature, education, and science. His spheres of science were natural science, chemistry, physics, mineralogy, history, art, philology, optical devices and others. Lomonosov was also a poet.

Lomonosov was born in the village of Denisovka in the far north of Russia. His father, Vasily Dorofeyevich Lomonosov amassed a small fortune transporting goods from Arkhangelsk to Lapland. Lomonosov had been taught to read as a boy by his neighbor Ivan Shubny, and he spent every spare moment with his books. In 1730, at nineteen, Lomonosov went to Moscow on foot, because he was determined to study. Not long after arriving, Lomonosov obtained admission into the Slavic Greek Latin Academy by falsely claiming to be a priest’s son.

Lomonosov was the first person to hypothesize the existence of an atmosphere on Venus based on his observation of the transit of Venus of 1761 in a small observatory near his house in Petersburg. In 1762, Lomonosov presented an improved design of a reflecting telescope to the Russian Academy of Sciences forum. His telescope had its primary mirror adjusted at an angle of four degrees to the telescope's axis. This made the image focus at the side of the telescope tube, where the observer could view the image with an eyepiece without blocking the image. However, this invention was not published until 1827, so this type of telescope has become associated with a similar design by William Herschel, the Herschelian telescope.

Lomonosov was the first person to record the freezing of mercury. Believing that nature is subject to regular and continuous evolution, he demonstrated the organic origin of soil, peat, coal, petroleum and amber. In 1745, he published a catalogue of over 3,000 minerals, and in 1760, he explained the formation of icebergs.

Lomonosov got close to the theory of continental drift, theoretically predicted the existence of Antarctica (he argued that icebergs of the South Ocean could be formed only on a dry land covered with ice), and invented sea tools which made writing and calculating directions and distances easier. In 1764, he organized an expedition (led by Admiral Vasili Chichagov) to find the Northeast Passage between the Atlantic and Pacific oceans by sailing along the northern coast of Siberia.

A lunar crater bears his name, as does a crater on Mars. In 1948, the underwater Lomonosov Ridge in the Arctic Ocean was named in his honor. Moscow State University was renamed ‘’M. V. Lomonosov Moscow State University’’ in his honor in 1940.>>
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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by praline » Thu Jun 27, 2013 9:18 pm

I've did a little searching and can't find how common these are. They're rare but that doesn't mean much.

My question is, in a given location, suitable far north/south, say 50 degrees, how often will I see them? Once a year, once a decade? Any ideas?

One link in the story says a researcher has only seen them once in 11 years but doesn't say where he was located. I've not knowingly seen them and I'm 45-47 degrees north. I've only been aware of them for a few years so it's possible I've seen them years ago and didn't recognize them.

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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by Chris Peterson » Thu Jun 27, 2013 9:28 pm

praline wrote:My question is, in a given location, suitable far north/south, say 50 degrees, how often will I see them? Once a year, once a decade? Any ideas?
In recent years, and given that you are in the optimal latitude range (especially in the northern hemisphere), you can probably expect to see them several times a year. And that number could be higher given that you could have a period of stable conditions and see them every night for at least a few days in a row.
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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by neufer » Thu Jun 27, 2013 9:48 pm

Click to play embedded YouTube video.
praline wrote:
My question is, in a given location, suitable far north/south, say 50 degrees, how often will I see them? Once a year, once a decade? Any ideas?

One link in the story says a researcher has only seen them once in 11 years but doesn't say where he was located. I've not knowingly seen them and I'm 45-47 degrees north. I've only been aware of them for a few years so it's possible I've seen them years ago and didn't recognize them.
You probably have about as much chance of seeing noctilucent clouds at 45-47 degrees north as you do of seeing aurora.
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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by luigi » Fri Jun 28, 2013 3:34 pm

I've never seen Noctilucent clouds or the Aurora. Living in the South hemisphere does have some drawbacks :D

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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by Chris Peterson » Fri Jun 28, 2013 3:44 pm

luigi wrote:I've never seen Noctilucent clouds or the Aurora. Living in the South hemisphere does have some drawbacks :D
Noctilucent clouds are somewhat more infrequent in the southern hemisphere, but your real problem is that you live too near the equator. I you moved further south, you'd certainly see plenty of auroras, if not noctilucent clouds.
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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by Beyond » Fri Jun 28, 2013 3:49 pm

luigi wrote:I've never seen Noctilucent clouds or the Aurora. Living in the South hemisphere does have some drawbacks :D
Don't feel bad about it luigi. I live in Connecticut and haven't seen an aurora in about 50 years, and don't think I've ever seen any noctilucent clouds. I do however catch sight of a meteor now and then, but every time it's time for meteor showers, it's cloudy. I did get to see a comet with binoculars once. So living in the north part isn't all it's cracked up to be.
NASA says there's two blood moons (lunar eclipses) and a solar eclispse and two more blood moons coming up in the future. I'll probably miss all those because of clouds also. But at least I'll be able to tell the solar eclipse is taking place, because it'll get really dark under the clouds. :mrgreen:
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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by luigi » Fri Jun 28, 2013 3:50 pm

Chris Peterson wrote:
luigi wrote:I've never seen Noctilucent clouds or the Aurora. Living in the South hemisphere does have some drawbacks :D
Noctilucent clouds are somewhat more infrequent in the southern hemisphere, but your real problem is that you live too near the equator. I you moved further south, you'd certainly see plenty of auroras, if not noctilucent clouds.
I'm not sure, the Aurora oval in the south hemisphere is, for some reason, displaced towards Australia. Auroras are common in Tasmania or south Australia but not at the same latitudes in Argentina. In fact I think there are no photos of Auroras from continental Argentina.
I call this "the aurora curse" :D

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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by luigi » Fri Jun 28, 2013 3:52 pm

Beyond wrote:
luigi wrote:I've never seen Noctilucent clouds or the Aurora. Living in the South hemisphere does have some drawbacks :D
Don't feel bad about it luigi. I live in Connecticut and haven't seen an aurora in about 50 years, and don't think I've ever seen any noctilucent clouds. I do however catch sight of a meteor now and then, but every time it's time for meteor showers, it's cloudy. I did get to see a comet with binoculars once. So living in the north part isn't all it's cracked up to be.
NASA says there's two blood moons (lunar eclipses) and a solar eclispse and two more blood moons coming up in the future. I'll probably miss all those because of clouds also. But at least I'll be able to tell the solar eclipse is taking place, because it'll get really dark under the clouds. :mrgreen:
Ah yes, most meteor showers favor the North Hemisphere too :D The Geminids are my only good meteor shower every year.
But in terms of eclipses I won't complain because Argentina has solar eclipses in 2017,18,19 and 20. Some of them really spectacular so we are going to be eclipseland soon :D
And of course I'll help anyone who is coming for the eclipses as much as I can.

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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by geckzilla » Fri Jun 28, 2013 3:58 pm

luigi wrote:I'm not sure, the Aurora oval in the south hemisphere is, for some reason, displaced towards Australia. Auroras are common in Tasmania or south Australia but not at the same latitudes in Argentina. In fact I think there are no photos of Auroras from continental Argentina.
I call this "the aurora curse" :D
How could this be?
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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by Chris Peterson » Fri Jun 28, 2013 4:09 pm

luigi wrote:I'm not sure, the Aurora oval in the south hemisphere is, for some reason, displaced towards Australia. Auroras are common in Tasmania or south Australia but not at the same latitudes in Argentina. In fact I think there are no photos of Auroras from continental Argentina.
I call this "the aurora curse" :D
The same thing happens in the northern hemisphere. In both cases, it's because the magnetic pole is offset from the rotational pole. Nevertheless, auroras are as common in the southern hemisphere as the north. Don't blame the hemisphere you live in, blame where in the hemisphere you live.

For astronomers, there are benefits to living someplace where auroras are rare. They are a horrible source of light pollution. In many high latitude locations, any serious astroimaging can be very difficult due to interference from auroras!
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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by Chris Peterson » Fri Jun 28, 2013 4:16 pm

geckzilla wrote:
luigi wrote:I'm not sure, the Aurora oval in the south hemisphere is, for some reason, displaced towards Australia. Auroras are common in Tasmania or south Australia but not at the same latitudes in Argentina. In fact I think there are no photos of Auroras from continental Argentina.
I call this "the aurora curse" :D
How could this be?
The auroral oval is centered on the magnetic pole, and the southern magnetic pole is substantially shifted towards Australia. That means if you are at the longitude of Australia, auroras are visible further north; in South America, they are shifted south.

The offset of the north magnetic pole explains why North America sees many more low latitude auroras than Asia or Europe.
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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by geckzilla » Fri Jun 28, 2013 4:21 pm

So it is. Maybe you have to be in Patagonia during winter to spot an aurora in Argentina and it's not a popular place to be during winter.
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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by luigi » Fri Jun 28, 2013 4:24 pm

geckzilla wrote:So it is. Maybe you have to be in Patagonia during winter to spot an aurora in Argentina and it's not a popular place to be during winter.
I don't think the Aurora oval ever touches continental Argentina at all. Maybe only under really exceptional magnetic activity but it would be extremely rare, as rare as an Aurora in Florida I would say :)

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Re: APOD: Noctilucent Clouds over Moscow (2013 Jun 27)

Post by Ann » Sun Jun 30, 2013 5:41 pm

What a lovely image! I find noctilucent clouds so beautiful.

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