A. V. Mikhailov

TL;DR: In this paper, a joint analysis of one carefully selected dataset was performed by six teams, which used different approaches to trend determination, and the results showed that the trends in foF2 are very small, of the order of −0.01 MHz/year, much smaller than the solar cycle effect and therefore sensitive to the solar activity correction.

TL;DR: In this paper, the authors describe results of the studies devoted to the solar activity impact on the Earth's upper atmosphere and ionosphere, conducted within the frame of COST ES0803 Action.

TL;DR: In this article, an overall statistical study of night-time enhancements of NmF2 has been carried out, where all available foF2 observations since 1955 at 53 ionosonde stations distributed worldwide in the latitude range f geom = 15° - 60° were used in the analysis.

TL;DR: In this article, a statistical analysis of two peaks (premidnight and post-midnight) occurrence in NmF2 daily variations was made on a latitudinal chain of four ionosonde stations in the Eurasian longitudinal sector.

TL;DR: In this article, the geomagnetic storm concept was used to explain the long-term trends of ionosphere-atmosphere interaction (HmF2) in the European and Asian longitudinal sectors.