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Jupiter’s poles crackle with volcano-induced auroras


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On Earth the aurora is intimately connected to solar activity. High speed electrons and protons from the sun find their way into the upper atmosphere by following invisible lines of magnetic force that surround our planet much like the those around an old fashioned horseshoe magnet. You can render the invisible visible by placing a magnet on a sheet of paper and sprinkling iron filings around it. Immediately they’ll align themselves in series of arcs defining the magnetic lines of force.


Solar wind particles are a bit like guided missiles. Under the...


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