Výsledky vyhledávání

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

Publikováno v: Journal of Geophysical Research: Space Physics. 118:7783-7797

[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

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d5eeb3d72842eceb24c3e98762789588
https://doi.org/10.1002/2013ja019337

Zobrazit plný text záznamu

The spectral extent of chorus in the off‐equatorial magnetosphere

Autor: Yuri Shprits, N. L. Bunch, Xudong Gu, Maria Spasojevic, F. R. Foust

Publikováno v: Journal of Geophysical Research

[1] Magnetospheric chorus waves are a major driver of acceleration and loss in the Earth's outer electron radiation belt. The spectral extent of chorus is a key parameter in quantifying the global effect of chorus on energetic particle populations by

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2017412775a73ea3e216bf3e2dec047a
https://doi.org/10.1029/2012ja018182

Zobrazit plný text záznamu

Modeling scattering from lightning-induced ionospheric disturbances with the discontinuous Galerkin method

Autor: Umran S. Inan, Timothy F. Bell, F. R. Foust, Maria Spasojevic

Publikováno v: Journal of Geophysical Research: Space Physics. 116

[1] Simulation of the propagation of very low frequency (VLF) waves in the Earth-ionosphere waveguide remains a significant computational challenge as a result of the variable wavelength at these frequencies in the magnetized plasma environment of th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::36ab68bb27703aa2e27631cea6558558
https://doi.org/10.1029/2011ja016973

Zobrazit plný text záznamu

Role of the plasmapause in dictating the ground accessibility of ELF/VLF chorus

Autor: Umran S. Inan, Daniel Golden, Maria Spasojevic, F. R. Foust, Nikolai Lehtinen, Nigel P. Meredith

Publikováno v: Journal of Geophysical Research: Space Physics. 115

This study explores the manner in which the plasmapause is responsible for dictating which magnetospheric source regions of ELF/VLF chorus are able to propagate to and be received by midlatitude stations on the ground. First, we explore the effects o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fe235cb37a8197694bcde03c5de228da
https://doi.org/10.1029/2010ja015955

Zobrazit plný text záznamu

Quasi-electrostatic whistler mode wave excitation by linear scattering of EM whistler mode waves from magnetic field-aligned density irregularities

Autor: Nikolai Lehtinen, Timothy F. Bell, Umran S. Inan, F. R. Foust

Publikováno v: Journal of Geophysical Research: Space Physics. 115

[1] Recent observations by Starks et al. (2008) from multiple spacecraft suggest that the actual nighttime intensity of VLF transmitter signals in the radiation belts is approximately 20 dB below the level that is assumed in the model developed by Ab

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d02a716ea13efebb1818a4ca4b53888e
https://doi.org/10.1029/2010ja015850

Zobrazit plný text záznamu

HF modulated ionospheric currents

Autor: J. A. Payne, Timothy W. Chevalier, F. R. Foust, T. F. Bell, Umran S. Inan

Publikováno v: Geophysical Research Letters. 34

[1] The HAARP HF facility is used to modulate the components of the auroral electrojet that flow in the D-region of the ionosphere, creating ELF/VLF radiation which is then measured at a receiver co-located with the HAARP HF antenna. An HF heating mo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::041db7376f132b1732c7cb05052c4aa1
https://doi.org/10.1029/2007gl031724

Zobrazit plný text záznamu

Finite difference frequency domain (FDFD) modeling of trans-ionospheric propagation of VLF signals over long sub-ionospheric paths

Autor: Timothy W. Chevalier, Timothy F. Bell, M.W. Chevalier, Umran S. Inan, F. R. Foust

Publikováno v: 2007 IEEE Antennas and Propagation Society International Symposium.

In this paper, we apply a recently developed Segmented-Long-Path (SLP) Finite Difference Frequency Domain (FDFD) model of VLF propagation over long (tens to hundreds of wavelengths) paths to determine the coupling of wave energy through the collision

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4d6fe3e8ff093d40dfaf3d930a578392
https://doi.org/10.1109/aps.2007.4395921

Zobrazit plný text záznamu

Discontinuous Galerkin particle-in-cell simulation of longitudinal plasma wave damping and comparison to the Landau approximation and the exact solution of the dispersion relation

Autor: Maria Spasojevic, F. R. Foust, Umran S. Inan, Timothy F. Bell

Publikováno v: Physics of Plasmas. 18:062111

We present results showing the measured Landau damping rate using a high-order discontinuous Galerkin particle-in-cell (DG-PIC) [G. B. Jacobs and J. S. Hesthaven, J. Comput. Phys. 214, 96 (2006)] method. We show that typical damping rates measured in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7c9f75f74e9545d887c8c3ddbbfbcdb1
https://doi.org/10.1063/1.3602123

Zobrazit plný text záznamu

Vyhledávací nástroje:

Upřesnit hledání