Variations in characteristics of the northern hemisphere's middle atmosphere during solar proton events of January 2005

Characteristics of the middle atmosphere of the Northern hemisphere were investigated during Solar Proton Events of January 2005; the data of the MERRA-2 archive being used. It was found that the events under study were accompanied by sharp changes of zonal wind velocity and temperature in the high-latitudinal atmosphere. The obtained results provide evidence for an intensification of the stratospheric polar vortex during the studied events, which was followed by a sharp weakening of the vortex and the development of a small stratospheric warming.