# Biblio

Found 13 results

**Authors:**Zheng Liheng, Chan Anthony A, Albert Jay M, Elkington Scot R, Koller Josef,

*et al.*

**Title:**

__Three-dimensional stochastic modeling of radiation belts in adiabatic invariant coordinates__

**Abstract**: A 3-D model for solving the radiation belt diffusion equation in adiabatic invariant coordinates has been developed and tested. The model, named Radbelt Electron Model, obtains a probabilistic solution by solving a set of Itô stochastic differential equations that are mathematically equivalent to the diffusion equation. This method is capable of solving diffusion equations with a full 3-D diffusion tensor, including the radial-local cross diffusion components. The correct form of the boundary condition at equatorial pitch angle α0=90° is also derived. The model is applied to a simulation of the October 2002 storm event. At α0 near 90°, our results are quantitatively consistent with GPS observations of phase space density (PSD) increases, suggesting dominance of radial diffusion; at sm. . .

**Date:**09/2014

**Publisher:**Journal of Geophysical Research: Space Physics

**Pages:**7615 - 7635

**DOI:**10.1002/jgra.v119.910.1002/2014JA020127

**Available at:**http://doi.wiley.com/10.1002/jgra.v119.9http://doi.wiley.com/10.1002/2014JA020127

*More Details***Authors:**Yu Yiqun, Jordanova Vania K., Ridley Aaron J., Albert Jay M, Horne Richard B,

*et al.*

**Title:**

__A new ionospheric electron precipitation module coupled with RAM-SCB within the geospace general circulation model__

**Abstract**: Electron precipitation down to the atmosphere due to wave-particle scattering in the magnetosphere contributes significantly to the auroral ionospheric conductivity. In order to obtain the auroral conductivity in global MHD models that are incapable of capturing kinetic physics in the magnetosphere, MHD parameters are often used to estimate electron precipitation flux for the conductivity calculation. Such an MHD approach, however, lacks self-consistency in representing the magnetosphere-ionosphere coupling processes. In this study we improve the coupling processes in global models with a more physical method. We calculate the physics-based electron precipitation from the ring current and map it to the ionospheric altitude for solving the ionospheric electrodynamics. In particular, we use . . .

**Date:**09/2016

**Publisher:**Journal of Geophysical Research: Space Physics

**DOI:**10.1002/2016JA022585

**Available at:**http://onlinelibrary.wiley.com/doi/10.1002/2016JA022585/full

*More Details***Authors:**Zheng Liheng, Chan Anthony A, Albert Jay M, Elkington Scot R, Koller Josef,

*et al.*

**Title:**

__Three-dimensional stochastic modeling of radiation belts in adiabatic invariant coordinates__

**Abstract**: A 3-D model for solving the radiation belt diffusion equation in adiabatic invariant coordinates has been developed and tested. The model, named Radbelt Electron Model, obtains a probabilistic solution by solving a set of Itô stochastic differential equations that are mathematically equivalent to the diffusion equation. This method is capable of solving diffusion equations with a full 3-D diffusion tensor, including the radial-local cross diffusion components. The correct form of the boundary condition at equatorial pitch angle α0=90° is also derived. The model is applied to a simulation of the October 2002 storm event. At α0 near 90°, our results are quantitatively consistent with GPS observations of phase space density (PSD) increases, suggesting dominance of radial diffusion; at sm. . .

**Date:**09/2014

**Publisher:**Journal of Geophysical Research: Space Physics

**Pages:**7615 - 7635

**DOI:**10.1002/jgra.v119.910.1002/2014JA020127

**Available at:**http://doi.wiley.com/10.1002/jgra.v119.9http://doi.wiley.com/10.1002/2014JA020127

*More Details***Authors:**Yu Yiqun, Jordanova Vania K., Ridley Aaron J., Albert Jay M, Horne Richard B,

*et al.*

**Title:**

__A new ionospheric electron precipitation module coupled with RAM-SCB within the geospace general circulation model__

**Abstract**: Electron precipitation down to the atmosphere due to wave-particle scattering in the magnetosphere contributes significantly to the auroral ionospheric conductivity. In order to obtain the auroral conductivity in global MHD models that are incapable of capturing kinetic physics in the magnetosphere, MHD parameters are often used to estimate electron precipitation flux for the conductivity calculation. Such an MHD approach, however, lacks self-consistency in representing the magnetosphere-ionosphere coupling processes. In this study we improve the coupling processes in global models with a more physical method. We calculate the physics-based electron precipitation from the ring current and map it to the ionospheric altitude for solving the ionospheric electrodynamics. In particular, we use . . .

**Date:**09/2016

**Publisher:**Journal of Geophysical Research: Space Physics

**DOI:**10.1002/2016JA022585

**Available at:**http://onlinelibrary.wiley.com/doi/10.1002/2016JA022585/full

*More Details***Authors:**Yu Yiqun, Jordanova Vania K., Ridley Aaron J., Albert Jay M, Horne Richard B,

*et al.*

**Title:**

__A new ionospheric electron precipitation module coupled with RAM-SCB within the geospace general circulation model__

**Abstract**: Electron precipitation down to the atmosphere due to wave-particle scattering in the magnetosphere contributes significantly to the auroral ionospheric conductivity. In order to obtain the auroral conductivity in global MHD models that are incapable of capturing kinetic physics in the magnetosphere, MHD parameters are often used to estimate electron precipitation flux for the conductivity calculation. Such an MHD approach, however, lacks self-consistency in representing the magnetosphere-ionosphere coupling processes. In this study we improve the coupling processes in global models with a more physical method. We calculate the physics-based electron precipitation from the ring current and map it to the ionospheric altitude for solving the ionospheric electrodynamics. In particular, we use . . .

**Date:**09/2016

**Publisher:**Journal of Geophysical Research: Space Physics

**DOI:**10.1002/2016JA022585

**Available at:**http://onlinelibrary.wiley.com/doi/10.1002/2016JA022585/full

*More Details***Authors:**Zheng Liheng, Chan Anthony A, Albert Jay M, Elkington Scot R, Koller Josef,

*et al.*

**Title:**

__Three-dimensional stochastic modeling of radiation belts in adiabatic invariant coordinates__

**Abstract**: A 3-D model for solving the radiation belt diffusion equation in adiabatic invariant coordinates has been developed and tested. The model, named Radbelt Electron Model, obtains a probabilistic solution by solving a set of Itô stochastic differential equations that are mathematically equivalent to the diffusion equation. This method is capable of solving diffusion equations with a full 3-D diffusion tensor, including the radial-local cross diffusion components. The correct form of the boundary condition at equatorial pitch angle α0=90° is also derived. The model is applied to a simulation of the October 2002 storm event. At α0 near 90°, our results are quantitatively consistent with GPS observations of phase space density (PSD) increases, suggesting dominance of radial diffusion; at sm. . .

**Date:**09/2014

**Publisher:**Journal of Geophysical Research: Space Physics

**Pages:**7615 - 7635

**DOI:**10.1002/jgra.v119.910.1002/2014JA020127

**Available at:**http://doi.wiley.com/10.1002/jgra.v119.9http://doi.wiley.com/10.1002/2014JA020127

*More Details***Authors:**Yu Yiqun, Jordanova Vania K., Ridley Aaron J., Albert Jay M, Horne Richard B,

*et al.*

**Title:**

**Abstract**: Electron precipitation down to the atmosphere due to wave-particle scattering in the magnetosphere contributes significantly to the auroral ionospheric conductivity. In order to obtain the auroral conductivity in global MHD models that are incapable of capturing kinetic physics in the magnetosphere, MHD parameters are often used to estimate electron precipitation flux for the conductivity calculation. Such an MHD approach, however, lacks self-consistency in representing the magnetosphere-ionosphere coupling processes. In this study we improve the coupling processes in global models with a more physical method. We calculate the physics-based electron precipitation from the ring current and map it to the ionospheric altitude for solving the ionospheric electrodynamics. In particular, we use . . .

**Date:**09/2016

**Publisher:**Journal of Geophysical Research: Space Physics

**DOI:**10.1002/2016JA022585

**Available at:**http://onlinelibrary.wiley.com/doi/10.1002/2016JA022585/full

*More Details***Authors:**Meredith Nigel P, Horne Richard B, Glauert Sarah A, Thorne Richard M, Summers D.,

*et al.*

**Title:**

__Energetic outer zone electron loss timescales during low geomagnetic activity__

**Abstract**: Following enhanced magnetic activity the fluxes of energetic electrons in the Earth's outer radiation belt gradually decay to quiet-time levels. We use CRRES observations to estimate the energetic electron loss timescales and to identify the principal loss mechanisms. Gradual loss of energetic electrons in the region 3.0 ≤ L ≤ 5.0 occurs during quiet periods (Kp < 3−) following enhanced magnetic activity on timescales ranging from 1.5 to 3.5 days for 214 keV electrons to 5.5 to 6.5 days for 1.09 MeV electrons. The intervals of decay are associated with large average values of the ratio fpe/fce (>7), indicating that the decay takes place in the plasmasphere. We compute loss timescales for pitch-angle scattering by plasmaspheric hiss using the PADIE code with wave properties based on C. . .

**Date:**05/2006

**Publisher:**Journal of Geophysical Research

**DOI:**10.1029/2005JA011516

**Available at:**http://onlinelibrary.wiley.com/doi/10.1029/2005JA011516/abstract

*More Details***Authors:**Yu Yiqun, Jordanova Vania K., Ridley Aaron J., Albert Jay M, Horne Richard B,

*et al.*

**Title:**

**Abstract**: Electron precipitation down to the atmosphere due to wave-particle scattering in the magnetosphere contributes significantly to the auroral ionospheric conductivity. In order to obtain the auroral conductivity in global MHD models that are incapable of capturing kinetic physics in the magnetosphere, MHD parameters are often used to estimate electron precipitation flux for the conductivity calculation. Such an MHD approach, however, lacks self-consistency in representing the magnetosphere-ionosphere coupling processes. In this study we improve the coupling processes in global models with a more physical method. We calculate the physics-based electron precipitation from the ring current and map it to the ionospheric altitude for solving the ionospheric electrodynamics. In particular, we use . . .

**Date:**09/2016

**Publisher:**Journal of Geophysical Research: Space Physics

**DOI:**10.1002/2016JA022585

**Available at:**http://onlinelibrary.wiley.com/doi/10.1002/2016JA022585/full

*More Details***Authors:**Zheng Liheng, Chan Anthony A, Albert Jay M, Elkington Scot R, Koller Josef,

*et al.*

**Title:**

__Three-dimensional stochastic modeling of radiation belts in adiabatic invariant coordinates__

**Abstract**: A 3-D model for solving the radiation belt diffusion equation in adiabatic invariant coordinates has been developed and tested. The model, named Radbelt Electron Model, obtains a probabilistic solution by solving a set of Itô stochastic differential equations that are mathematically equivalent to the diffusion equation. This method is capable of solving diffusion equations with a full 3-D diffusion tensor, including the radial-local cross diffusion components. The correct form of the boundary condition at equatorial pitch angle α0=90° is also derived. The model is applied to a simulation of the October 2002 storm event. At α0 near 90°, our results are quantitatively consistent with GPS observations of phase space density (PSD) increases, suggesting dominance of radial diffusion; at sm. . .

**Date:**09/2014

**Publisher:**Journal of Geophysical Research: Space Physics

**Pages:**7615 - 7635

**DOI:**10.1002/jgra.v119.910.1002/2014JA020127

**Available at:**http://doi.wiley.com/10.1002/jgra.v119.9http://doi.wiley.com/10.1002/2014JA020127

*More Details***Authors:**Zheng Liheng, Chan Anthony A, Albert Jay M, Elkington Scot R, Koller Josef,

*et al.*

**Title:**

__Three-dimensional stochastic modeling of radiation belts in adiabatic invariant coordinates__

**Abstract**: A 3-D model for solving the radiation belt diffusion equation in adiabatic invariant coordinates has been developed and tested. The model, named Radbelt Electron Model, obtains a probabilistic solution by solving a set of Itô stochastic differential equations that are mathematically equivalent to the diffusion equation. This method is capable of solving diffusion equations with a full 3-D diffusion tensor, including the radial-local cross diffusion components. The correct form of the boundary condition at equatorial pitch angle α0=90° is also derived. The model is applied to a simulation of the October 2002 storm event. At α0 near 90°, our results are quantitatively consistent with GPS observations of phase space density (PSD) increases, suggesting dominance of radial diffusion; at sm. . .

**Date:**09/2014

**Publisher:**Journal of Geophysical Research: Space Physics

**Pages:**7615 - 7635

**DOI:**10.1002/jgra.v119.910.1002/2014JA020127

**Available at:**http://doi.wiley.com/10.1002/jgra.v119.9http://doi.wiley.com/10.1002/2014JA020127

*More Details***Authors:**Yu Yiqun, Jordanova Vania K., Ridley Aaron J., Albert Jay M, Horne Richard B,

*et al.*

**Title:**

**Abstract**: Electron precipitation down to the atmosphere due to wave-particle scattering in the magnetosphere contributes significantly to the auroral ionospheric conductivity. In order to obtain the auroral conductivity in global MHD models that are incapable of capturing kinetic physics in the magnetosphere, MHD parameters are often used to estimate electron precipitation flux for the conductivity calculation. Such an MHD approach, however, lacks self-consistency in representing the magnetosphere-ionosphere coupling processes. In this study we improve the coupling processes in global models with a more physical method. We calculate the physics-based electron precipitation from the ring current and map it to the ionospheric altitude for solving the ionospheric electrodynamics. In particular, we use . . .

**Date:**09/2016

**Publisher:**Journal of Geophysical Research: Space Physics

**DOI:**10.1002/2016JA022585

**Available at:**http://onlinelibrary.wiley.com/doi/10.1002/2016JA022585/full

*More Details***Authors:**Yu Yiqun, Jordanova Vania K., Ridley Aaron J., Albert Jay M, Horne Richard B,

*et al.*

**Title:**

**Abstract**: Electron precipitation down to the atmosphere due to wave-particle scattering in the magnetosphere contributes significantly to the auroral ionospheric conductivity. In order to obtain the auroral conductivity in global MHD models that are incapable of capturing kinetic physics in the magnetosphere, MHD parameters are often used to estimate electron precipitation flux for the conductivity calculation. Such an MHD approach, however, lacks self-consistency in representing the magnetosphere-ionosphere coupling processes. In this study we improve the coupling processes in global models with a more physical method. We calculate the physics-based electron precipitation from the ring current and map it to the ionospheric altitude for solving the ionospheric electrodynamics. In particular, we use . . .

**Date:**09/2016

**Publisher:**Journal of Geophysical Research: Space Physics

**DOI:**10.1002/2016JA022585

**Available at:**http://onlinelibrary.wiley.com/doi/10.1002/2016JA022585/full

*More Details*