On November 22, a breathtaking aurora resembling the letter ‘E’ lit up the skies over Alaska. This rare celestial event was caused by a phenomenon known as black auroras or anti-auroras, leaving skywatchers in awe of its exceptional beauty.
The extraordinary E-shaped aurora was captured above Alaska by aurora hunter Todd Salat at around 4 a.m. local time. Salat, in his interview with spaceweather.com, mentioned, “It came up from the northwest and I was like, ‘whoa!’ It looked like the letter E to me. Within just a few minutes it sailed overhead on its back and looked like some critter with its legs in the air.”
Auroras typically form when charged particles from the Sun interact with Earth’s magnetic fields, energizing gas molecules in the upper atmosphere and creating vibrant light displays. In contrast, black auroras deflect charged particles back into space, forming dark streaks or patches amid the glowing ribbons of light.
In 2001, the European Space Agency’s (ESA) Cluster satellite passed through a black aurora event and uncovered vertical cells in the upper atmosphere creating ionospheric cavities. Further research in 2015 confirmed that these structures form due to the magnetosphere’s response to solar storms. The magnetosphere, the region of space around a planet that is dominated by the planet’s magnetic field, undergoes shifts during solar storms, creating the conditions necessary for black auroras.
Aurora activity is expected to remain high over the coming years as the Sun approaches solar maximum, the peak of its 11-year sunspot cycle. This means that the chances of observing more black auroras with flashy displays of lights at the poles are higher than usual.
Scientists are eager to study these rare events further, hoping to uncover more about the mechanisms behind black auroras and their relationship with Earth’s magnetic field.
The rare E-shaped aurora over Alaska offers a stunning glimpse into the intricate beauty and hidden secrets of Earth’s upper atmosphere. Ongoing research will shed light on the conditions required for these unique formations and reveal more about the complexities of our planet’s magnetic shield.
For more aurora information, visit the European Space Agency’s website.
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