Earth photos

Northern Lights. Planet Earth

Northern Lights. Planet Earth

An aurora is a luminosity that occurs at high altitude, and generally above 60 ° latitude, although it is also observed in other areas. As it occurs in the northern or southern hemisphere, it is called aurora borealis or southern aurora. The term polar aurora applies in both cases. The aurora consists of rapidly changing spots and luminous columns, of various shades.

Extensive aurora phenomena are accompanied by disturbances in terrestrial magnetism and interference with radio, telephone and telegraph transmissions. The periods of maximum and minimum intensity of the auroras coincide almost exactly with those of the sunspot cycle, which lasts 11 years.

Earth's atmosphere

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Earth's atmosphereSun eclipse
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