NASAのインスタグラム(nasa) - 4月12日 04時55分
Sunrise is seen creeping across Earth as the green glow of the southern hemisphere's aurora dances below the International Space Station (@国際宇宙ステーション). NASA astronaut Ricky Arnold snapped this image from his perch high above the planet on humanity's orbiting laboratory on April 9.
The glimmering lights of auroras provide spectacular views, but also capture the imagination of scientists who study incoming energy and particles from our Sun. Auroras are one effect of such energetic particles, which can speed out from the Sun both in a steady stream called the solar wind or from giant eruptions known as coronal mass ejections or CMEs.
After a trip toward Earth that can last three days, the solar particles and magnetic fields cause the release of particles already trapped near Earth, which in turn trigger reactions in the upper atmosphere in which oxygen and nitrogen molecules release photons of light. The result: the Northern and Southern lights.
Credit: NASA/@Astro_Ricky
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