what is the light level in the arctic circle?
92613
In the polar night: zero\nThe polar day can be months and the snow reflects alot of light to your eyes. Ther you need sunglasses. Low sun.
788986
Also, there would no longer be months-long "days" and "nights" inside the Arctic Circle.  A day would be about 12 hours long and so would a night, everywhere, and at the North and South Poles, I think it would be perpetual twilight.  (There wouldn't be a sharp division between night and day for the same reason that there isn't now--because the light is scattered in the atmosphere.)
395042
Yes, there is no light at the bottom of the ocean. Fish are extremely small, measureing about 3 to 6 inches and are bioluminecent - meaning they glow in the dark. For several reasons: Attracting food - other unsuspecting fish, or for mating. It is not easy finding a mate at the bottom of the ocean. The fish are small because food is scarce so potential for growth is naturally limited. The fish's eyes are usually large in proportion to the body size to allow the maximum amount of light in for vision, if they have eyes at all. There is snow, but not the kind you and I might know, it is called marine snow. It falls just like snow on land, and never stops. This consists mainly of tests, or shells, from dead marine organisms from the above waters, or organic matter. Organic matter is anything that contains carbon. The bottom of the ocean is a cool place. Have you heard of hydrothermal vents? They contain chemosynthetic organisms that obtain energy by breaking down inorganic chemicals. Humans rely on the sun for producing all of our energy. Well anyways I am rambling. But I like it.\n\nAlso remember at the bottom of the ocean there is pressure, much more than you feel at the surface of the earth. Thousands of pounds of pressure pushing in from all directions. Squish, squish.
63325
Geophysist, I would like to study the Aurora Borealis
526281
In and near the  Arctic Circle Aurora borealis.The aurora borealis most often occurs from September to October and March to April. The aurora is now known to be caused by electrons of typical energy of 1-15 keV, i.e. the energy obtained by the electrons passing through a voltage difference of 1,000-15,000 volts. The light is produced when they collide with atoms of the upper atmosphere, typically at altitudes of 80-150 km. It tends to be dominated by emissions of atomic oxygen--the greenish line at 557.7 nm and (especially with electrons of lower energy and higher altitude) the dark-red line at 630.0 nm. Both these represent "forbidden" transitions of atomic oxygen from energy levels which (in absence of collisions) persist for a long time, accounting for the slow brightening and fading (0.5-1 sec) of auroral rays. Many other lines can also be observed, especially those of molecular nitrogen, and these vary much faster, revealing the true dynamic nature of the aurora.
258869
In a dark(ened) room.\nUse a smal lamp. Move it up and down. Choose one pupil and let the other ones see how the length of his shadow changes with the altitude of the lamp.
146984
Northern lights originate from our sun. During large explosions and flares, huge quantities of solar particles are thrown out of the sun and into deep space. These plasma clouds travel through space with speeds varying from 300 to 1000 kilometers per second. \n\nBut even with such speeds (over a million kilometer per hour), it takes these plasma clouds two to three days to reach our planet. When they are closing in on Earth, they are captured by Earth's magnetic field (the magnetosphere) and guided towards Earth's two magnetic poles; the geomagnetic south pole and the geomagnetic north pole.\n\n\n\nOn their way down towards the geomagnetic poles, the solar particles are stopped by Earth's atmosphere, which acts as an effective shield against these deadly particles.\n\nWhen the solar particles are stopped by the atmosphere, they collide with the atmospheric gases present, and the collision energy between the solar particle and the gas molecule is emitted as a photon - a light particle. And when you have many such collisions, you have an aurora - lights that may seem to move across the sky. \n\nIn order for an observer to actually see the aurora with the naked eye, about a 100 million photons are required.\n\n\nFor more info :-\nhttp://www.northern-lights.no/english/what/cause.shtml
108438
Hmmm ... that's an interesting question.  If you consider that the North Pole is located in Canada, then Canada must be one of the countries that has the least hours of daylight.  I lived for a year about 700 miles from the North Pole and the sun set on November 2 and didn't rise again until about February 3 or 4.  So we had about three months of total darkness.  And of course in September, October, February and March, the hours of daylight were quite short.\n\nHowever, in April, May, June, July and August we had pretty much 24 hours of daylight, and for almost 3 months of that time, 24 hours of sunlight, so it is a bit of a balancing act.\n\nParts of Greenland might be almost as far north as the most northerly parts of Canada, but I believe that is the only country that comes close.  Norway, Finland, Russia, have short days, but I don't believe they ever have 24 hours of darkness.\n\nA similar situation exists as you get closer to the south pole.  If we want to be srtictly accurate, I suppose Antarctica is actually a continent and not a country, so I don't know if you want to count it. \n\nI hope this helps.
195704
The sun appears at night in places in the far northern reaches during June. North of the Arctic Circle (66.5 degrees north latitude), the "midnight sun" appears.\n\nThe phenomenon also occurs around the winter solstice in the southern hemisphere, but south of the Antarctic Circle (66.5 degrees south). So it's not in any single country, but those places north or south of the given lines of latitude.
1012414
the more north during the winter months you go from the equator, the longer the it stays dark, there is one day in a year in North Pole where it will stay dark for 24 hours, the same holds true for the southern hemisphere during its respective winter time.
1171426
yes, however it only appears as a small point of moving light tracking across the sky. \n\nYou would have to get an orbital schedual, its orbital track, get a nice dark night (new moons are best) and be away from light pollution... central rockies are a good place...
154703
white b/c you're at the north pole
355818
The further north you are, the better results you will have.  Typically, you need to live above 53 degrees latitude to see them on a regular basis, but with BIG solar storms, the aurora can be seen as far south as 30 degrees.\n\nWinter months tend to be better viewing months because the aurora occurs in the shadow of the earth from the sun.  The North Pole is mostly in darkness during this time of year.  Also, the air is clearer because it's cold and there's less moisture in the air.  At night, the best times are the hours near midnight.\n\nIn the continental U.S., you can see the aurora in the Northernmost states a handful of times throughout the year, based on solar activity.\n\nBelow is a site to check out to see what the present solar activity is like and the forecast.  This will help determine which nights might provide success.
58666
The graph would show a maximum daylight on June 21 with a minimum of dark, and a maximum of dark on December 21 with a minimum of daylight, but I doubt that it would be sinusoidal, because near the north pole there are extended periods of days with no darkness in the summer, indicating an oscillating function, but not sinusoidal.
510353
The Aurora Borealis or Northern Lights and its counter part, Aurora Australis in the southern hemisphere is a phenomenon created from a set of complex interactions between the Earth’s and Sun’s magnetic fields, in conjunction with the passage of photons emitted by the Sun through the Earth’s gravitational sphere of influence. Photons and other high-energy particles are refracted downward by Earth’s gravity as they transverse through its magnetic field with concentrated energy flows at the poles.
984543
Countries which have significant territory within the Arctic Circle are:\n\nCanada, Denmark (Greenland), Finland, Norway, Russia, Sweden and United States (Alaska)\n\nThe country of Iceland also has territory within the Arctic Circle, but less than 1 km². This area is on a few small islets, of which only Grímsey (which lies directly on the Arctic Circle) is inhabited.\n\nThere are very few people living above the Arctic Circle. The largest towns above the Arctic Circle are Murmansk (population 325,100) in Russia, and Norilsk (135,000) also in Russia. Tromsø in Norway has about 62,000 dwellers, whereas Rovaniemi in Finland has a bit less than 58,000 inhabitants.
930949
Hi. Albedo results from two properties, reflectance and illumination. The illumination follows the inverse square law so, knowing the distance, you can calculate the actual illumination. Diameter vs albedo is a tougher problem because as one goes up the other goes down. If you assume a relatively pristine ice body you can make a pretty good guess. Short of an occultation that seems to be about as good as you can get.