Cseh-magyar kétoldalú nemzetközi mobilitási pályázat(NKM2018-28)
Űridőjárási események ionoszférikus hatásának vizsgálata közepes szélességeken(BO/00461/21)
Támogató: Bolyai János Kutatási Ösztöndíj
A szporadikus E térbeli és időbeli variabilitása közepes szélességen / Közép-Európa
felett(KMP-2023/77) Támogató: HUN-REN
Mesoscale convective systems are effective sources of atmospheric disturbances that
can reach ionospheric heights and significantly alter atmospheric and ionospheric
conditions. Convective systems can affect the Earth’s atmosphere on a continental
scale and up to F-layer heights. Extratropical cyclone “Zyprian” occurred at the beginning
of July, 2021 and dominated weather over the whole of Europe. An extensive cold front
associated with “Zyprian” moved from the western part to the eastern part of Europe,
followed by ground-level convergence and the formation of organized convective thunderstorm
systems. Torrential rains in the Czech Republic have caused a great deal of damage
and casualties. Storm-related signatures were developed in ground microbarograph measurements
of infrasound and gravity waves. Within the stratosphere, a shift of the polar jet
stream and increase in specific humidity related to the storm system were observed.
At the ionospheric heights, irregular stratification and radio wave reflection plane
undulation were observed. An increase in wave-like activity was detected based on
ionograms and narrowband very-low-frequency (VLF) data. On directograms and SKYmaps
(both products of digisonde measurements), strong and rapid changes in the horizontal
plasma motion were recorded. However, no prevailing plasma motion direction was identified
within the F-layer. Increased variability within the ionosphere is attributed mainly
to the “Zyprian” cyclone as it developed during low geomagnetic activity and stable
solar forcing.
