Bulge in Venus' Atmosphere Likely Caused by Gravity Waves

The massive bow wave is visible in the upper atmosphere of Venus in this infrared image. (Credit: ©Planet-C) A massive, bow-shaped wave was spotted for the first time in the highest regions of Venus' atmosphere, perplexing astronomers. The structure was captured by the Japan Aerospace Exploration Agency (JAXA) in some of the first images returned by their Akatsuki orbiter following a troubled orbital insertion in late 2015. Using both infrared and UV imaging, researchers spotted the prominent feature in the planet's upper atmosphere, where winds whip by in excess of 200 miles per hour. Any features spotted in the atmosphere should get carried along by the fierce winds, but this curved wave remained planted firmly in place, lasting for at least four days.