Structural changes in lower ionosphere wind trends at midlatitudes
Article, Other literature type
Merzlyakov, E. G.
Liu, R. Q.
Solovjova, T. V.
Portnyagin, Y. I.
- Publisher: Copernicus Publications
TA1-2040 | Engineering (General). Civil engineering (General)
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.