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Auroras are natural light shows caused by magnetic storms triggered by the Sun’s activity like explosive flares and coronal mass ejections (ejected gas bubbles). Solar winds carry the energetically charged particles from these events to Earth’s atmosphere.
When these particles seep through Earth's magnetosphere, a part of our atmosphere that protects us from solar and cosmic radiation, they cause substorms. These fast-moving substorm particles slam into our thin, high atmosphere, colliding with Earth's oxygen and nitrogen particles. As these air particles shed the energy they picked up from the collision, each atom starts to glow in a different color—causing the brilliant ribbons of light which weave across Earth's northern or southern polar regions.
Typically, auroras are visible closer to Earth’s poles, where the magnetosphere is generally weakest; however, when the Sun releases especially powerful solar storms, auroras can be seen further from the poles. Just that happened this past week when a powerful geomagnetic storm delighted skywatchers with auroras as far south as Virginia and Arizona!
Video description: The northern lights as seen from the International Space Station. The video begins with the green hues of the northern lights dancing across the skies of North America. The curvature of the Earth is visible where the auroras in the atmosphere meet the darkness of space. As the video continues it moves further southeast across North America, revealing the bright lights of cities across the midwest United States.
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