Evaluating the influence of lightning generated whistlers on the overall VLF wave intensity detected by alow-altitude spacecraft

0490221 - ÚFA 2019 DE eng A - Abstrakt
Záhlava, J. - Němec, František - Santolík, Ondřej - Kolmašová, Ivana - Parrot, M.
Evaluating the influence of lightning generated whistlers on the overall VLF wave intensity detected by alow-altitude spacecraft.
Geophysical Research Abstracts. Vol. 20. Göttingen: European Geosciences Union, 2018. EGU2018-4367-1. E-ISSN 1607-7962.
[EGU General Assembly 2018. 08.04.2018-13.04.2018, Vienna]
Institucionální podpora: RVO:68378289
Klíčová slova: whistler * lightning * VLF (verylowfrequency) wave * magnetosphere
Obor OECD: Fluids and plasma physics (including surface physics)
https://meetingorganizer.copernicus.org/EGU2018/EGU2018-4834.pdf

The influence of lightning generated whistlers on the overall very low frequency (VLF) wave intensity in the Earth’s inner magnetosphere is still a subject of discussion. We combine lightning location data and VLF wave intensity measured by a low altitude spacecraft to identify frequency-location intervals where this influence is significant. The World Wide Lightning Location Network (WWLLN) provides a unique data set of times and locations of lightningstrokesallaroundtheworld.WhencombinedwiththewavemeasurementsperformedbytheDEMETER spacecraft(Sun-synchronous polar orbit, altitude o fabout 700 km), it allows us to calculate average/medianpower spectral densities of electric field fluctuations in the frequency range up to 20 kHz distinguished according to the lightning activity level. A comparison of the dependencies obtained for low and high lightning activity levels is then used to determine the influence of lightning generated whistlers. The obtained results are discussed in the frame of a possible relation to the plasmaspheric hiss generation.
Trvalý link: http://hdl.handle.net/11104/0284491