Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2022 May 22
The featured image is a very short video showing
the Sun's surface reacting to a large solar flare. The 
result is a large circular shockwave that begins to
circle the Sun. The image was taken by the Optical
Solar Patrol Network telescope in New Mexico in 2006.
Please see the explanation for more detailed information.

A Large Tsunami Shock Wave on the Sun
Image Credit: NSO/AURA/NSF and USAF Research Laboratory

Explanation: Tsunamis this large don't happen on Earth. During 2006, a large solar flare from an Earth-sized sunspot produced a tsunami-type shock wave that was spectacular even for the Sun. Pictured here, the tsunami wave was captured moving out from active region AR 10930 by the Optical Solar Patrol Network (OSPAN) telescope in New Mexico, USA. The resulting shock wave, known technically as a Moreton wave, compressed and heated up gasses including hydrogen in the photosphere of the Sun, causing a momentarily brighter glow. The featured image was taken in a very specific red colour emitted exclusively by hydrogen gas. The rampaging tsunami took out some active filaments on the Sun, although many re-established themselves later. The solar tsunami spread at nearly one million kilometres per hour, and circled the entire Sun in a matter of minutes.

Tomorrow's picture: andromeda now and again


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