Search
Skip to Search Results 15Marchand, Richard
 15Rankin, Robert
 9Lu, J. Y.
 5Kabin, Konstantin
 4Tikhonchuk, Vladimir T.
 3Clauer, C. Robert
 5Shear Alfven Waves
 4Field Line Resonances
 4Magnetosphere
 3Acceleration
 3Global Mhd Modeling
 2Alfven Waves

Diffraction, self‐focusing, and the geometrical optics limit in laser produced plasmas
1987
Capjack, C. E., Birnboim, A., Rankin, Robert, Marchand, Richard
The effect of diffraction on the self‐modulation of an intense laser beam in an initially uniform hydrogen plasma is investigated. A formalism is used in which the diffraction term in the paraxial wave equation can be arbitrarily reduced by the use of a weight factor ι. In the limit where ι...

Self‐focusing and ion wave generation in laser‐produced plasmas
1988
Rankin, Robert, Marchand, Richard, Capjack, C. E.
Two‐dimensional hydrodynamic simulations of laser light self‐focusing in a hydrogen plasma are presented. The simulation code includes a model for laser beam propagation which accounts for inverse bremsstrahlung absorption, refraction, diffraction, and ponderomotive forces. A Gaussian hot spot,...

2002
Zank, G. P., Lu, J. Y., Rankin, Robert, Marchand, Richard
The propagating source method for solving the timedependent Boltzmann equation describing particle propagation in a magnetically turbulent medium is extended to a more realistic case that includes focusing and adiabatic deceleration. The solutions correspond to beam propagation in the solar...

Dynamic response of Earth's magnetosphere to By reversalsournal of Geophysical Research: Space Physics, 108(A3), [pp
Download2003
Papitashvili, V., Clauer, C. Robert, Kabin, Konstantin, Gombosi, Tamas I., DeZeeuw, Darren L., Rankin, Robert, Marchand, Richard, Ridley, Aaron J.
In this paper we use a threedimensional magnetohydrodynamic (MHD) model to study the response of the magnetosphereionosphere system to a sudden change in the sign of the By component of the interplanetary magnetic field. We find that after such a change the magnetosphere responds as a linear...

Finite element modeling of nonlinear dispersive field line resonances: Trapped shear Alfvén waves inside field‐aligned density structures
Download20030101
Marchand, Richard, Rankin, Robert, Wanliss, J. , Tikhonchuk, V. T., Lu, J. Y.
Using a new two dimensional nonlinear finite element model, we investigate the interaction of dispersive shear Alfven wave ( SAW) field line resonances ( FLRs) and ion acoustic waves in Earth's magnetosphere. We solve the full set of nonlinear reduced MHD equations self consistently in...

2003
Marchand, Richard, Lu, J. Y., Rankin, Robert, Tikhonchuk, Vladimir T.
Nonlinear dynamics of a dispersive field line resonance (FLR) is investigated in a dipolar magnetic geometry using a new finite element code TOPO. Time dependent dispersion and steepening of the perpendicular Alfvén velocity profile lead to the acceleration of dispersive effects and to...

Open‐closed field line boundary position: A parametric study using an MHD modelournal of Geophysical Research: Space Physics, 109(A5), [pp
Download2004
De Zeeuw, Darren L., Clauer, C. Robert, Kabin, Konstantin, Gombosi, Tamas I., Rostoker, Gordon, Rankin, Robert, Rae, I. Johnathan, Marchand, Richard, Ridley, Aaron J.
In this paper we investigate the effect of changes in the interplanetary magnetic field ( IMF), solar wind dynamic pressure, and dipole tilt angle on the position of the ionospheric projection of the openclosed field line boundary (OCB) in a magnetohydrodynamic (MHD) model. We carry out a large...

Open‐closed field line boundary position: A parametric study using an MHD modelournal of Geophysical Research: Space Physics, 109(A5), [pp
Download2004
Clauer, C. Robert, Rostoker, G., Kabin, Konstantin, Gombosi, Tamas I., DeZeeuw, Darren L., Rankin, Robert, Rae, I. Jonathan, Marchand, Richard, Ridley, Aaron J.
In this paper we investigate the effect of changes in the interplanetary magnetic field ( IMF), solar wind dynamic pressure, and dipole tilt angle on the position of the ionospheric projection of the openclosed field line boundary (OCB) in a magnetohydrodynamic (MHD) model. We carry out a large...

Magnetospheric field‐line resonances: Ground‐based observations and modelingournal of Geophysical Research: Space Physics, 110(A10), [pp
Download2005
Mann, I. R., Kabin, Konstantin, Donovan, E. F., Lu, J. Y., Rankin, Robert, Rae, I. Jonathan, Marchand, Richard
We present theory and groundbased observations of fieldline resonances (FLRs) excited in Earth's magnetosphere. Three FLR observations are reported, which correspond to largescale standing shear Alfven wave (SAW) oscillations on nightside field lines extending from premidnight to close to...

2005
Marchand, Richard, Lu, J. Y., Rankin, Robert, Tikhonchuk, Vladimir T.
Ionospheric electron heating by resonant standing shear Alfvén waves in Earth's magnetosphere is investigated. It is demonstrated that in field line resonances (FLRs), electron heating by Alfvén waves produces ionization and large changes in the ionospheric Pedersen conductivity. This leads to a...