Articles | Volume 8
Adv. Radio Sci., 8, 231–236, 2010
https://doi.org/10.5194/ars-8-231-2010
Adv. Radio Sci., 8, 231–236, 2010
https://doi.org/10.5194/ars-8-231-2010

  01 Oct 2010

01 Oct 2010

Structural changes in lower ionosphere wind trends at midlatitudes

C. Jacobi1, E. G. Merzlyakov2, R. Q. Liu1, T. V. Solovjova2, and Y. I. Portnyagin2 C. Jacobi et al.
  • 1Institute for Meteorology, University of Leipzig, Stephanstr. 3, 04103 Leipzig, Germany
  • 2Research and Production Association "Typhoon", Institute for Experimental Meteorology, 4, Pobeda Str., 249038 Obninsk, Russia

Abstract. Long-term variability of the mesosphere/lower thermosphere (lower E region ionosphere) since 1970 has been analyzed using wind data series obtained at Collm (52° N, 15° E) using the LF drift method and at Obninsk (55° N, 37° E) applying VHF meteor radar. Applying piecewise linear trend analysis with a priori unknown number and positions of breakpoints shows that trend models with breakpoints are generally to be preferred against straight lines. There is a strong indication for a change of trends in wind parameters around 1975–1980. Similar changes are also found in the lower atmosphere, e.g., in tropospheric temperatures. This indicates a coupling between atmospheric layers at time scales of decades.