Extended lateral heating of the nighttime ionosphere by ground-based VLF transmitters

Autor:	K. L. Graf, Maria Spasojevic, F. R. Foust, Robert A. Marshall, Nikolai Lehtinen, Umran S. Inan
Rok vydání:	2013
Předmět:	Physics Scattering Transmitter Electron precipitation Perturbation (astronomy) Geophysics Physics::Geophysics Space and Planetary Science Probe signal Physics::Space Physics Modulation (music) Ionosphere Very low frequency Computer Science::Information Theory
Zdroj:	Journal of Geophysical Research: Space Physics. 118:7783-7797
ISSN:	2169-9380
DOI:	10.1002/2013ja019337
Popis:	[1] The effects of ground‒based very low frequency (VLF) transmitters on the lower ionosphere are investigated. Controlled modulation experiments are performed with the 21.4 kHz, 424 kW VLF transmitter NPM in Lualualei, Hawaii, and physical effects of the NPM transmissions are studied with a subionospherically propagating VLF probe signal. Observed perturbations to the probe signal are consistent neither with expectations from transmitter‒induced electron precipitation nor to off‒path scattering from a concentrated heating region near the transmitter but rather appear to be the result of scattering from extended lateral heating of the ionosphere by the NPM transmitter. A large‒scale computational modeling framework confirms theoretically that this form of ionospheric heating can account for the observed probe signal modulations, establishing that the lateral extent of ionospheric heating due to VLF transmitters is several thousand kilometers, significantly greater than previously recognized.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d5eeb3d72842eceb24c3e98762789588 https://doi.org/10.1002/2013ja019337 Zobrazit plný text záznamu Plný text