Activity is forecast to wane Tuesday night, but aurora could be visible at high latitudes, in places like northern Canada, Alaska and far northern Europe.
as “bright enough to amply light up the ground and surrounding objects enough to see without a flashlight.”
Activity is forecast to wane Tuesday night, but the aurora could be visible at high latitudes in places like northern Canada, Alaska and far northern Europe.The northern lights, also known as the aurora, are generated when the sun sends a gush of energy and particles toward Earth, commonly through an explosion on the sun called a coronal mass ejection. When the particles reach Earth, they temporarily disturb the protective magnetic shield around our planet.
Satellites showed that a coronal mass ejection occurred on Sept. 16 and reached Earth from Monday night into Tuesday morning, arriving earlier and stronger than originally forecast. NOAA’s Space Weather Prediction Centerthe activity generated a strong geomagnetic storm — a three on a scale to five — that brought aurora sightings down to middle latitudes.
The colors of the aurora are dependent on the type and altitude of the particle excited. Oxygen atoms located 120 miles above the surface shine red when excited but glow green from 60 to 120 miles. Excited nitrogen atoms glow pink or purple below 120 miles.Northern lights sightings were more intense at higher latitudes, appearing as vivid undulating curtains of greens, purples and reds. Middle latitudes experienced dimmer red displays, perhaps less dynamic than they were farther north.
But aurora chasers were delighted to see the natural phenomenon regardless. Here are some beautiful aurora sightings from across the world:
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