Aurora borealis corona

Aurora borealis corona

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Credit: DR JUERG ALEAN/SCIENCE PHOTO LIBRARY

Caption: Aurora borealis corona. This so-called 'corona' occurs, when the stream of charged particles flow exactly in the direction of the observer. The aurora borealis is a coloured light display (the northern lights) that is visible in the night sky, usually only at high latitudes. It occurs when charged and energetic particles from the Sun (the solar wind) are drawn by Earth's magnetic field to the polar regions. Hundreds of kilometres up, they collide with gas molecules and atoms, causing them to emit light. Photographed over Norway.

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Keywords: 2014, 21st century, arctic, astronomical, astronomy, aurora, aurora borealis, corona, discharge, discharging, earth's magnetic field, europe, european, february, geomagnetic storm, geomagnetism, geophysics, glow, glowing, light display, magnetism, meteorological, meteorology, nature, night, night sky, night-time, no-one, nobody, northern lights, norway, norwegian, physical, physics, skyscape, solar activity, solar storm, solar wind, space weather, winter

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