Solar terminator and corresponding variability within ionospheric plasma

0492768 - ÚFA 2019 DD eng A - Abstrakt
Koucká Knížová, Petra - Kouba, Daniel - Mošna, Zbyšek - Obrazová, Dalia
Solar terminator and corresponding variability within ionospheric plasma.
7th IAGA/ICMA/SCOSTEP Vertical Coupling Workshop: Abstracts. Potsdam: International Association of Geomagnetism and Aeronomy (IAGA), 2018.
[IAGA/ICMA/SCOSTEP Workshop on Vertical Coupling in the Atmosphere-Ionosphere System /6./. 02.07.2018-06.07.2018, Potsdam]
Institucionální podpora: RVO:68378289
Klíčová slova: solar terminator * ionospheric variability * acoustic gravity waves
Obor OECD: Meteorology and atmospheric sciences
https://www.gfz-potsdam.de/fileadmin/gfz/sec11/image/images-projects/VCAIS_2018/Book_of_abstracts.pdf

The Ionosphere is highly variable system that shows oscillations on wide range of
scales. Such variability is caused by variety of sources from above and below. The ionosphere
is mainly influenced by Sun and magnetosphere. However, the forcing from below by
processes in the lower-laying atmospheric regions cannot be omitted. The oscillation within
ionospheric plasma can be detected on a broad scales ranging from acoustic and gravity
waves to oscillations on periods corresponding to solar cycles.
Within the ionospheric variability, the Acoustic-Gravity Waves (AGW) play an
important role. They are present in the atmosphere and ionosphere all the time and their
attribution to the particular source still remains an open task. The AGWs, their sources,
persistence, propagation, are systematically studied since sixties.
Solar Terminator has been identified as an important source of AGW in the Earth
atmosphere-ionosphere system. The cooling/heating of the Earth’s atmosphere induced by
decrease/increase of the incoming solar radiation is a potential generator of the wave/like
disturbances that are likely to propagate through the atmosphere-ionosphere system. Due to
the systematic occurrence of AGWs during sunrise and sunset, it has been proven
experimentally, that the moving region of atmospheric constituents with large gradients acts a
source of AGW structures. However, the variability in periodicity and persistence of AGWs is
very large and the observational techniques limited. The presentation focuses on Solar
Terminator and related ionospheric variability.
Trvalý link: http://hdl.handle.net/11104/0286142