The Northern Lights Auroral particles : Visual forms and colors Part-1

in #science8 years ago

Auroras are produced when the magnetosphere is sufficiently disturbed by the solar wind that the trajectories of charged particles in both solar wind and magnetospheric plasma They vary in color and intensity and as opposed to the moon, sun and stars they are unpredictable and unique. The Northern Lights in Norway are called the night-time Aurora because they are on the night-side of the earth. The Northern Lights - nature's own light show - are solar winds that meet the atmosphere in a zone around the magnetic North Pole, forming arches, waves and curls of light moving across the sky, with sudden rays of light shooting down from space.

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The spectacular Northern Lights are visible in the Arctic parts of Norway from October through March.

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Auroras are produced when the magnetosphere is sufficiently disturbed by the solar wind that the trajectories of charged particles in both solar wind and magnetospheric plasma, mainly in the form of electrons and protons, precipitate them into the upper atmosphere (thermosphere/exosphere), where their energy is lost.

Auroral particles

The cause of the ionization and excitation of atmospheric constituents leading to auroral emissions was discovered in 1960, when a pioneering rocket flight from Fort Churchill in Canada revealed a flux of electrons entering the atmosphere from above

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Auroras and the atmosphere

The main causes of Auroras is emissions of photons in the Earth's upper atmosphere, above 80 km, from ionized nitrogen atoms regaining an electron, and oxygen atoms and nitrogen based molecules returning from an excited state to ground state

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