Northern light enthusiasts in Alaska got a surprise on Saturday when a light baby blue spiral resembling a galaxy appeared amid the aurora. 9News
They are called Von Kármán vortices."They can occur whenever an object interrupts airflow. In this case, they occurred as winds rushed past the tall volcanic peaks of the Canary Islands," the space agency said.
"Cloud vortices are often spotted downwind of isolated islands including near Guadalupe Island, near the coast of Chile, and in the Indian Ocean".When sunset fell last week, nurse Jónína Guðrún Óskarsdóttir headed out into the brisk dusk near her home in eastern Iceland in the hopes of capturing the northern lights.As the sun slipped below the horizon the clouds shimmered and appeared as if they were painted in multiple colours.
Normally clouds don't form here, but when it's cold enough tiny ice crystals are born, allowing them to.
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