Relativistic diffusion coefficients for superluminous (auroral kilometric radiation) wave modes in space plasmas

2006 ◽  
Vol 111 (A11) ◽  
Author(s):  
Fuliang Xiao ◽  
Huiyong He ◽  
Qinghua Zhou ◽  
Huinan Zheng ◽  
Shui Wang
Keyword(s):  
Diffusion Coefficients ◽  
Space Plasmas ◽  
Auroral Kilometric Radiation ◽  
Radiation Wave ◽  
Wave Modes

scholarly journals A parametric ray tracing study of superluminous auroral kilometric radiation wave modes

2007 ◽  
Vol 112 (A10) ◽  
pp. n/a-n/a ◽  
Author(s):  
Fuliang Xiao ◽  
Lunjin Chen ◽  
Huinan Zheng ◽  
Shui Wang
Keyword(s):  
Ray Tracing ◽  
Auroral Kilometric Radiation ◽  
Radiation Wave ◽  
Wave Modes

On wave modes, structures and turbulence in space plasmas: Cluster results

2007 ◽  
Author(s):  
F. Sahraoui ◽  
B. Grison ◽  
G. Belmont ◽  
J. F. Panis ◽  
L. Rezeau
Keyword(s):  
Space Plasmas ◽  
Wave Modes

scholarly journals Finite Larmor Radius Modifications to the Magnetoionic Wave Modes and Their Effects on Electron Cyclotron Maser Emission

1986 ◽  
Vol 39 (3) ◽  
pp. 407
Author(s):  
LT Ball ◽  
RG Hewitt
Keyword(s):  
Maximum Growth ◽  
Electron Cyclotron ◽  
Larmor Radius ◽  
Maser Emission ◽  
Finite Larmor Radius ◽  
Electron Cyclotron Maser ◽  
Cyclotron Maser ◽  
Auroral Kilometric Radiation ◽  
Solar Microwave ◽  
Wave Modes

Auroral kilometric radiation, Jupiter's decametric and Saturn's kilometric radio emissions, solar microwave spike bursts and microwave emissions from some flare stars have all been attributed to the electron cyclotron maser instability. The maser instability is usually assumed to involve the generation of magnetoionic waves. We investigate the modifications to the magneto ionic wave modes due to finite Larmor radius (FLR) corrections arising from a 'warm' background electron plasma with a Maxwellian distribution. We then consider the effects of these modifications on maser emission at frequencies near the fundamental of the electron cyclotron frequency fl e. The FLR effects are found to be small; the maximum temporal growth rate generally differs by ~ 10% from that for emission occurring in the magnetoionic modes. Small shifts occur in the frequencies and propagation angles corresponding to the maximum growth rates.

Interlayer mixing in GaAs/AlxGa1-xAs heterostructures as a result of Se+ ion implantation

1988 ◽  
Vol 46 ◽  
pp. 908-909
Author(s):  
E.G. Bithell ◽  
W.M. Stobbs
Keyword(s):  
Ion Implantation ◽  
Diffusion Coefficients ◽  
Dark Field ◽  
Atomic Mass ◽  
Composition Profile ◽  
Semiconductor Heterostructures ◽  
Transmission Electron ◽  
Microscope Images ◽  
Damage Process ◽  
Electron Energy Loss

It is well known that the microstructural consequences of the ion implantation of semiconductor heterostructures can be severe: amorphisation of the damaged region is possible, and layer intermixing can result both from the original damage process and from the enhancement of the diffusion coefficients for the constituents of the original composition profile. A very large number of variables are involved (the atomic mass of the target, the mass and energy of the implant species, the flux and the total dose, the substrate temperature etc.) so that experimental data are needed despite the existence of relatively well developed models for the implantation process. A major difficulty is that conventional techniques (e.g. electron energy loss spectroscopy) have inadequate resolution for the quantification of any changes in the composition profile of fine scale multilayers. However we have demonstrated that the measurement of 002 dark field intensities in transmission electron microscope images of GaAs / AlxGa1_xAs heterostructures can allow the measurement of the local Al / Ga ratio.

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