Simulations of ELVES based on different return stroke models

0490234 - ÚFA 2019 DE eng A - Abstrakt
Kašpar, Petr - Kolmašová, Ivana - Santolík, Ondřej - Popek, Martin
Simulations of ELVES based on different return stroke models.
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: ELVES (Emission of Light and Very Low Frequency perturbations due to Electromagnetic Pulse Sources) * lightning flash * return stroke model
Obor OECD: Fluids and plasma physics (including surface physics)
https://meetingorganizer.copernicus.org/EGU2018/EGU2018-7798.pdf

ELVES are transient luminous events occurring in the lower ionosphere at a height of about 90 km. They are triggered by energetic lightning discharges. We investigate various conditions leading to this phenomenon with emphasis on the return stroke processes. We use different engineering models, namely a transmission line model without attenuation of the current and modified transmission line models with a linear or exponential decay of the current with height, in order to investigate the shape and intensity of resulting ELVES. We show that the exponential attenuation of the current with height can decrease optical intensity of the modelled ELVES. Consequently, an energetic lightning flash with a peak current larger than 100 kA might not lead to an observable optical emission.
Trvalý link: http://hdl.handle.net/11104/0284502