Mercury has X-ray auroras. Now we know what causes them.
For Mercury, “this is really the first time to detect these electrons directly,” says space plasma physicist Sae Aizawa of the University of Pisa in Italy.
Buffeted by the solar wind, the sun-facing side of a planet’s magnetic field gets squished while the night side is swept out into a long “magnetotail” that extends behind the planet. Eventually, the magnetotail stretches so much that its formerly mostly-parallel magnetic field lines snap and reconnect, sending some field lines flying off behind the planet and others back toward it.
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