Abstract
In the winter of 1983/1984, the research institutes of the Soviet Union took an active part in the accomplishment of the project “Winter in Northern Europe” of the Middle Atmosphere Program (MAP/WINE). Different methods were used to measure temperature, direction and velocity of wind, turbulence, electron density in the lower ionosphere, and radio wave absorption. The study of the stratospheric warmings and the related changes in the mesosphere and lower ionosphere was considered of special importance. The analysis of the obtained data has shown, in particular, that during stratospheric warmings the westerly wind in wintertime becomes weaker and even reverses. At the same time period the electron density and the radio wave absorption in the lower ionosphere are often reduced. It is also observed that the high absorption zones move from west to east. These results confirm the concept about the role of the cyclonic circumpolar vortex in the transport of the auroral air to temperate latitudes and about the appearance of conditions for the winter anomalous radio wave absorption.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
