Gravity wave signatures in mesospheric/lower thermospheric winds caused by Hunga Tonga-Hunga Ha‘apai volcanic eruption identified by CONDOR and the Nordic Meteor Radar Cluster 

<p>Gravity waves are a major source of the middle atmospheric short-term variability. The Hunga Tonga-Hunga Ha&#8216;apai volcanic eruption provided a unique opportunity to study gravity wave propagation around the globe from a well-defined source. The eruption triggered several atmospheric signatures including a lamb wave (troposphere/stratosphere/mesosphere) and a package of gravity waves. Here we present results of gravity wave signatures found in mesospheric winds leveraging multi-static meteor radar networks such as the Nordic Meteor Radar Cluster and CONDOR. We were able to identify the eastward and westward propagating gravity waves. Furthermore, it was possible to estimate the intrinsic wave properties such as a horizontal wavelength of approximately 1600-2000 km and an intrinsic phase speed of 200 m/s.</p>