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De Wikipedia, la enciclopedia encyclopedia
Las auroras boreales son un fenómeno natural que pinta el cielo nocturno con exóticos y surrealistas colores. Las auroras australes también ocurren pero no son observadas tan frecuentemente.
Las auroras son causadas por partículas cargadas eléctricamente lanzadas por el sol. Cuando estas partículas alcanzan la tierra colisionar con átomos y moléculas gaseosos en la capa más superior de la atmósfera, energizándolas y creando un espectáculo multicolor. Las partículas cargadas son afectadas por los campos magnéticos por lo que las auroras ocurren principalmente en las latitudes norte y sur, cerca de los polos magnéticos de la Tierra.
The Lights look somewhat similar to a sunset in the sky at night, but appear occasionally in arcs or spirals usually following the earth's magnetic field. They fairly often look like moving curtains of light, high in the sky. They are most often light green in color but often have a hint of pink. Strong eruptions also have violet and white colors. Red northern lights are rare, but are sometimes observed.
The Lights are generally fairly dim, but sometimes bright enough that reading a newspaper on a moonless night is possible. Both brightness and how far from the poles they are visible vary according to three factors: time of year, an 11-year cycle in solar activity, and solar storms. These are discussed in more detail later.
To observers at far-northern latitudes, the Lights are a frequent occurrence, but many who live in more temperate climates have never seen them, even though they are occasionally seen as far south as 35 degrees North latitude. This article will help you improve your chances of seeing the Lights if you journey north.
Light pollution around cities can mask a dim aurora display. Therefore, areas at least 30 km from cities are preferred for viewing. The trick is to get far enough from cities for good viewing (generally easy, since most northern areas are not heavily populated) without taking undue risks in a climate that can easily kill you.