scholarly journals Proton-temperature-anisotropy-driven magnetic fields in plasmas with cold and relativistically hot electrons

2009 ◽  
Vol 76 (1) ◽  
pp. 1-5 ◽  
Author(s):  
NITIN SHUKLA ◽  
P. K. SHUKLA
Keyword(s):  
Free Energy ◽  
Electromagnetic Wave ◽  
Dispersion Relation ◽  
Magnetic Fields ◽  
Hot Electrons ◽  
Temperature Anisotropy ◽  
Astrophysical Plasmas ◽  
Proton Temperature ◽  
Component Plasma ◽  
Cold Electrons

AbstractWe present a dispersion relation for a plane-polarized electromagnetic wave in plasmas composed of cold electrons, relativistically hot electrons and bi-Maxwellian protons. It is shown that the free energy in proton-temperature anisotropy drives purely growing electromagnetic modes in our three-component plasma. Expressions for the growth rates and thresholds of instabilities are presented. The present results are relevant for explaining the origin of spontaneously generated magnetic fields in laboratory and astrophysical plasmas.

Propagation of hydromagnetic waves in a cold plasma mixed with hot electrons

1984 ◽  
Vol 31 (1) ◽  
pp. 153-171 ◽  
Author(s):  
Hiromitsu Hamabata ◽  
Tomikazu Namikawa
Keyword(s):  
Magnetic Field ◽  
Cold Plasma ◽  
Amplitude Ratio ◽  
Phase Speed ◽  
Hot Electrons ◽  
Temperature Anisotropy ◽  
Left Handed ◽  
Cold Electrons ◽  
Hydromagnetic Waves ◽  
Propagation Properties

The propagation of small-amplitude hydromagnetic waves in a cold plasma mixed with hot electrons is investigated using the first order CGL equations for electrons. It is assumed that in an equilibrium state the electrons consist of two components, cold electrons and hot electrons with bi-Maxwellians. Propagation properties of hydromagnetic waves are analysed by use of phase speed and refractive index surfaces, polarization, and the amplitude ratio between perturbed density and magnetic field. It is shown that the existence of cold electrons affects the properties of hydromagnetic waves through finite frequency corrections only when the temperature anisotropy exists; and that the existence of cold electrons diminishes the resonance angle and the critical angle at which the polarization sense changes from left-handed to right-handed, and also weakens the tendency of intermediate waves to follow the lines of force of the static magnetic field.

Instability of low-frequency waves in a cold plasma mixed with hot electrons

1985 ◽  
Vol 33 (3) ◽  
pp. 437-441 ◽  
Author(s):  
Hiromitsu Hamabata ◽  
Tomikazu Namikawa
Keyword(s):  
Equilibrium State ◽  
Electron Temperature ◽  
Cold Plasma ◽  
Low Frequency ◽  
Hot Electrons ◽  
Hot Electron ◽  
Temperature Anisotropy ◽  
First Order ◽  
Cold Electrons ◽  
Low Frequency Waves

The instability of low-frequency waves in a cold plasma mixed with hot electrons is investigated using the first-order CGL equations for electrons. It is assumed that in an equilibrium state the electrons consist of two components, cold electrons and hot electrons with bi-Maxwellians. It is shown that low-frequency waves with right-hand polarization can be generated by the hot electron temperature anisotropy and the existence of cold electrons.

scholarly journals Nonlinear saturation of the Weibel instability in a dense Fermi plasma

2009 ◽  
Vol 75 (2) ◽  
pp. 251-258 ◽  
Author(s):  
F. HAAS ◽  
P. K. SHUKLA ◽  
B. ELIASSON
Keyword(s):  
Growth Rate ◽  
Dispersion Relation ◽  
Magnetic Fields ◽  
Intense Laser ◽  
Linear Growth Rate ◽  
Quantum Plasma ◽  
Temperature Anisotropy ◽  
Nonlinear Saturation ◽  
Linear Dispersion ◽  
Transverse Waves

AbstractWe present an investigation for the generation of intense magnetic fields in dense plasmas with an anisotropic electron Fermi–Dirac distribution. For this purpose, we use a new linear dispersion relation for transverse waves in the Wigner–Maxwell dense quantum plasma system. Numerical analysis of the dispersion relation reveals the scaling of the growth rate as a function of the Fermi energy and the temperature anisotropy. The nonlinear saturation level of the magnetic fields is found through fully kinetic simulations, which indicates that the final amplitudes of the magnetic fields are proportional to the linear growth rate of the instability. The present results are important for understanding the origin of intense magnetic fields in dense Fermionic plasmas, such as those in the next-generation intense laser–solid density plasma experiments.

scholarly journals Temperature anisotropy relaxation of the one-component plasma

2017 ◽  
Vol 57 (6-7) ◽  
pp. 238-251 ◽  
Author(s):  
Scott D. Baalrud ◽  
Jérôme Daligault
Keyword(s):  
Temperature Anisotropy ◽  
Component Plasma ◽  
The One

Spin density wave – metal (superconductor) competition: A phase segregation scenario

2002 ◽  
Vol 12 (9) ◽  
pp. 61-64
Author(s):  
C. Pasquier ◽  
M. Héritier ◽  
D. Jérome
Keyword(s):  
Free Energy ◽  
Dispersion Relation ◽  
Fermi Level ◽  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Phase Segregation ◽  
Organic Conductor ◽  
One Dimensional ◽  
Unique Parameter

We present a model comparing the free energy of a phase exhibiting a segregation between spin density wave (SDW) and metallic domains (eventually superconducting domains) and the free energy of homogeneous phases which explains the findings observed recently in (TMTSF)2PF6. The dispersion relation of this quasi-one-dimensional organic conductor is linearized around the Fermi level. Deviations from perfect nesting which stabilizes the SDW state are described by a unique parameter t$'_b$, this parameter can be the pressure as well.

Magnetic Superlattice: Localized Magnetostatic Waves and Magnetic Polaritons

2003 ◽  
Vol 17 (15) ◽  
pp. 829-839
Author(s):  
R. T. Tagiyeva ◽  
M. Saglam
Keyword(s):  
Magnetic Material ◽  
Electromagnetic Wave ◽  
Dispersion Relation ◽  
Wave Theory ◽  
Frequency Region ◽  
Long Wavelength ◽  
Magnetostatic Waves ◽  
General Dispersion ◽  
Magnetic Polaritons ◽  
Magnetic Superlattice

Localized magnetostatic waves and magnetic polaritons at the junction of the magnetic material and magnetic superlattice composed of the alternating ferromagnetic or ferromagnetic and nonmagnetic layers are investigated in the framework of the electromagnetic wave theory in Voigt geometry. The general dispersion relation for localized magnetic polaritons and magnetostatic waves (MW) are derived in the long-wavelength limit. The dispersion curves and frequency region of the exsistence of the localized MW and magnetic polaritons are calculated numerically.

Sign in / Sign up

Export Citation Format

Share Document