Radiating conducting columns inside the Earth–ionosphere waveguide: Application to red sprites

Autor:	Richard L. Dowden, James R. Wait, Neil R. Thomson, Craig J. Rodger
Rok vydání:	1998
Předmět:	Physics Atmospheric Science Electron density Scattering business.industry Conductivity Electromagnetic radiation Physics::Geophysics Geophysics Optics Sprite (lightning) Space and Planetary Science Thunderstorm Earth–ionosphere waveguide Ionosphere business Astrophysics::Galaxy Astrophysics
Zdroj:	Journal of Atmospheric and Solar-Terrestrial Physics. 60:1177-1204
ISSN:	1364-6826
DOI:	10.1016/s1364-6826(98)00073-x
Popis:	Expressions are developed to characterise the scattering of VLF electromagnetic waves from a finite-length ionised column at some height in the Earth–ionosphere waveguide. This formulation has been examined to investigate the perturbations of VLF transmissions caused by scattering from red sprites (very large luminous phenomena observed over thunderstorms). The idea of a correction factor is advanced to move from a previous model using infinitely long columns to one with truncated columns (50–90 km altitude) inside the waveguide. Using a night-time ionosphere model a quantitative comparison is made between experimentally observed and modelled red sprite scattering characteristics. It is found that the conductivity of the sprite columns (spritelets) must be about 10 −4 S m −1 to generate the experimentally observed scattered fields. This suggests that the electron density of red sprites can be five orders of magnitude greater than the night-time ambient electron density at some heights.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e99aa408098274ccd9468acc179f0fc2 https://doi.org/10.1016/s1364-6826(98)00073-x Zobrazit plný text záznamu Full Text from ScienceDirect