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Space weather

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Cluster probes the mysteries of the black aurora

The dark band in the green aurora pictured here is an example of a black aurora. A black aurora isn't an aurora at all; rather it is a lack of auroral activity. The black aurora is only visible to the naked eye if it is embedded in a region of diffuse (faint) aurora.

Credits: Photograph courtesy of Jan Curtis, Fairbanks, Alaska

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Solar wind buffets Earth's magnetic field

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A wind of particles from the Sun called the solar wind buffets the blue funnel-shaped magnetosphere around the Earth.

Credits: ESA

Last update: 7 July 2004

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