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What Causes the Different Colors in Aurora Borealis and Australis?
科学常识延展阅读·自动延展（批次0001-020）
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Auroras glow when charged solar particles collide with gases high in Earth’s atmosphere.
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Oxygen atoms at very high altitudes emit rare red light, while lower ones produce green—the most common color.
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Nitrogen molecules contribute blue or purplish hues, especially during intense geomagnetic storms.
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The altitude of collisions determines which gases get excited and what color we see from the ground.
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Solar wind speed and magnetic field orientation influence both aurora brightness and color variety.
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Cameras with long exposures often capture colors invisible to the naked eye in low-light conditions.
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Different planets show unique auroral colors based on their atmospheric composition—like Saturn’s ultraviolet glow.
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Scientists use spectrometers to analyze aurora light and learn about upper-atmosphere chemistry.
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Magnetic latitude matters too: people near the Arctic Circle see more vivid displays than those farther south.
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Studying auroras helps us understand space weather effects on satellites and power grids.