Dr. Yasunobu Miyoshi (Kyushu University, Japan) will deliver a talk on the topic, "Warming in the Antarctic mesosphere and lower thermosphere caused by an Arctic Stratospheric Sudden warming (SSW) event" at the IAP colloquium.

He will shed light on a stratospheric sudden warming event (SSW) in the Norther hemisphere which is one of the drastic phenomena in the middle atmosphere. Recent studies have been revealed that SSWs affect the general circulation in the Southern hemisphere. In his talk, impacts of SSWs on the temperature in the Antarctic mesosphere and lower thermosphere will be discussed by using a whole atmosphere-ionosphere couple model (GAIA). Lower figure shows time-latitude section of the zonal mean temperature near the North Pole from December 2018 to February 2019. An SSW event occurred at the end of December, 2018, and a warming event near the South pole at 80 and 85 km heights appeared several days after the SSW (upper figure). Furthermore, a warming event in the lower thermosphere also occurred after the SSW. This means that an interhemispheric coupling process plays an important role on the temperature in the southern hemisphere. Mechanisms for these warming events are shown, and future plans are discussed.