Main drivers and interhemispheric circulation of TIDs

0503828 - ÚFA 2020 DE eng A - Abstract
Burešová, Dalia - Belehaki, A. - Watermann, J. - Galkin, I. - Tsagouri, I. - Kouba, Daniel - Altadill, D. - Blanch, E. - Šindelářová, Tereza - Urbář, Jaroslav - Habarulema, J. B. - Katamzi, Z. - Saxonbergová-Jankovičová, Dana
Main drivers and interhemispheric circulation of TIDs.
Geophysical Research Abstracts. Vol. 21. Göttingen: European Geosciences Union, 2019. EGU2019-7216.
[EGU General Assembly 2019. 07.04.2019-12.04.2019, Vienna]
Institutional support: RVO:68378289
Keywords : interhemispheric circulation * traveling ionospheric disturbance (TID)
OECD category: Meteorology and atmospheric sciences
https://meetingorganizer.copernicus.org/EGU2019/EGU2019-7216.pdf

Definition of the main TID drivers in the geospace and the Earth’s atmosphere and hemispherical circulation of TIDs are among the major challenges of the project TechTIDE supported by the European Commission Horizon 2020 research and innovation program that will advance our scientific understanding of the TID formation and propagation mechanisms and will support the identification, verification and early warning systems. The postanalysis was used to identify the drivers of TIDs. We analysed data from different kinds of available observations to get a realistic representation of the state of the environment before and at the time of the event. The main TID drivers are: geomagnetic storms (CME- CIR/HSS-related events), auroral activity, polar cusp electrons and protons, troposphere - ionosphere coupling (drivers of meteorological origin), seismic activity, solar terminator, eclipse, anthropogenic sources. The analysis is considering drivers for LSTID and for MSTID based on data from open data repositories and events catalogues. This paper deals with several most efficient TID drivers. In order to obtain quantitative information on the likeliness and morphology of interhemispheric circulation of TIDs 38 events were examined lasting between 8 and 24 hours each, during which TID were observed according to the TID occurrence list prepared in the frame of the TechTIDE project. We used exclusively GPS-based detection methods, specifically information on TEC, TEC deviations in space and time from a background reference (dTEC), and the Rate of TEC change in time (ROT), all inferred from GPS receiver networks in Europe and Africa. Under the constraint that our data sample was heavily biased toward geomagnetic storm time events we conclude that hemispheric conjugacy of LSTID is highly probable while interhemispheric circulation rather unlikely but still occurring during some periods.
Permanent Link: http://hdl.handle.net/11104/0295611