New paper on polar mesosphere horizontal divergence and relative vorticity
We present a novel approach to measure new parameters of the wind field at altitudes between 80 and 100 km at polar latitudes. The approach consists of using closely located radars. These radars measure the winds from observing the time evolution of meteor trails. Since the echos from meteor trails are strong, the radars used are relatively small. We have analyzed data from radars in northern Norway that have been operating for more than 12 years. This is the first time that such data sets are combined to explore new parameters like horizontal divergence and relative vorticity. The climatology of this new parameters shows that there are persistent and well-identified patterns at the polar summer mesosphere. We expect that the new parameters will be useful in future efforts to improve the understanding of processes in this part of the atmosphere.