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The Hunga Tonga-Hunga Ha'apai volcano erupted on 15 January 2022 with anenergy equivalent to around 61 megatons of TNT. The explosion was bigger thanany other volcanic eruption so far in the 21st century. Huge quantities ofparticles, including dust and water vapour, were released into the atmosphere.We present the results of a preliminary study of the effects of the explosionon observations taken at Paranal Observatory using a range of instruments.These effects were not immediately transitory in nature, and a year laterstunning sunsets are still being seen at Paranal.

Effects of the Hunga Tonga-Hunga Ha'apai Volcanic Eruption on Observations at Paranal Observatory