Astronomy Picture of Day: Aurora Over Clouds# Astronomy - 天文
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Aurora Over Clouds
Credit & Copyright: Dominic Cantin
Explanation: Aurorae usually occur high above the clouds. The auroral glow is created when fast-moving
particles ejected from the Sun impact air molecules high in the Earth's atmosphere. An oxygen molecule, for
example, will glow in a green light when reacquiring an electron lost during a collision with a solar particle. The
lowest part of an aurora will typically occur at 100 kilometers up, while most clouds usually
Credit & Copyright: Dominic Cantin
Explanation: Aurorae usually occur high above the clouds. The auroral glow is created when fast-moving
particles ejected from the Sun impact air molecules high in the Earth's atmosphere. An oxygen molecule, for
example, will glow in a green light when reacquiring an electron lost during a collision with a solar particle. The
lowest part of an aurora will typically occur at 100 kilometers up, while most clouds usually