Nothern Lights: cuando el cielo se tiñe de colores

8 10 2010

Probablemente muchos reconozcan esta foto antes de leer la entrada. También quizás otros tantos se metan en el blog porque les interese el tema, el caso que hoy ante la falta de novedades en la vida korallí me voy a dedicar a hablar del que casi seguro será mi próximo viaje (solo o en compañia): La Aurora Boreal

The northen lights are natural light displays in the sky, particularly in the polar regions, and usually observed at night. They illuminate the northern horizon as a greenish glow or sometimes a faint red, as if the Sun were rising from an unusual direction. The northen lights most often occurs near the equinoxes. (You don´t think that I can write this. The Dictionary and Google help me).

La dificultad de encontrar la Aurora Boreal se debe a que el cielo tiene que estar despejado para que se pueda ver y que haga temperaturas muy bajas. Es más que probable que vaya a Laponia y me vuelva sin haberla visto. De todas formas esa experencia de ir al invierno polar, todo el día de noche, temperatura extremas y nieve por doquier es algo inigualable

Two days ago I spoke with Laura, a finish girl who lives in Rovariemi, and they show me some amazing pictures. Besides she told that the Nothern Lights are best seen for 2-3 hours around midnight although they can be visible from dusk to dawn. A moonless night well away from light pollution is ideal, so I want go to her town.

Some questions: (http://www.loc.gov/rr/scitech/mysteries/northernlights.html).

Can I see them anywhere?
Yes. Although more frequent at higher latitudes, closer to the poles (such as in Canada, Alaska, Antarctica), they have been seen closer to the equator as far south as Mexico. To view them, look in the direction of the closest pole (the northern horizon in the northern hemisphere, the southern horizon in the southern hemisphere).

Can I see them at any time of the year?
Yes. In some areas, such as Alaska or Greenland, they may be visible most nights of the year. And they occur at any time of the day, but we can’t see them with the naked eye unless it’s dark.

What causes the colors and patterns?
Colors and patterns are from the types of ions or atoms being energized as they collide with the atmosphere and are affected by lines of magnetic force. Displays may take many forms, including rippling curtains, pulsating globs, traveling pulses, or steady glows. Altitude affects the colors. Blue violet/reds occur below 60 miles (100 km), with bright green strongest between 60-150 miles (100-240 km). Above 150 miles (240 km) ruby reds appear.

For more information about Nothern Lights, check it: http://fairbanks-alaska.com/northern-lights-alaska.htm

Ahora les dejo con el video para que disfruten.


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