scholarly journals Solitary dispersive Alfvén wave in a plasma composed of hot positrons, cold electrons and ions

AIP Advances ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 035204
Author(s):  
Y. Liu ◽  
Y. Bai
Keyword(s):  
Alfven Wave ◽  
Electrons And Ions ◽  
Cold Electrons ◽  
Dispersive Alfvén Wave

Dispersive Alfvén Wave Control of O + Ion Outflow and Energy Densities in the Inner Magnetosphere

2019 ◽  
Vol 46 (15) ◽  
pp. 8597-8606 ◽  
Author(s):  
A. J. Hull ◽  
C. C. Chaston ◽  
J. W. Bonnell ◽  
J. R. Wygant ◽  
C. A. Kletzing ◽  
...  
Keyword(s):  
Alfven Wave ◽  
Ion Outflow ◽  
Inner Magnetosphere ◽  
Dispersive Alfvén Wave ◽  
Wave Control

scholarly journals Electron acoustic solitary waves with non-thermal distribution of electrons

2004 ◽  
Vol 11 (2) ◽  
pp. 275-279 ◽  
Author(s):  
S. V. Singh ◽  
G. S. Lakhina
Keyword(s):  
Solitary Waves ◽  
Auroral Zone ◽  
Thermal Electron ◽  
Electrons And Ions ◽  
Cold Electrons ◽  
Field Lines ◽  
Unmagnetized Plasma ◽  
Zone Field ◽  
Electron Acoustic ◽  
Pseudo Potential

Abstract. Electron-acoustic solitary waves are studied in an unmagnetized plasma consisting of non-thermally distributed electrons, fluid cold electrons and ions. The Sagdeev pseudo-potential technique is used to carry out the analysis. The presence of non-thermal electrons modifies the parametric region where electron acoustic solitons can exist. For parameters representative of auroral zone field lines, the electron acoustic solitons do not exist when either α > 0.225 or Tc/Th > 0.142, where α is the fractional non-thermal electron density, and Tc (Th) represents the temperature of cold (hot) electrons. Further, for these parameters, the simple model predicts negatively charged potential structures. Inclusion of an electron beam in the model may provide the positive potential solitary structures.

Nonlinear decay of dispersive Alfvén wave and solar coronal heating

2010 ◽  
Vol 77 (2) ◽  
pp. 237-244 ◽  
Author(s):  
SANJAY KUMAR ◽  
R. P. SHARMA
Keyword(s):  
Wave Interaction ◽  
Magnetized Plasma ◽  
Alfven Wave ◽  
Growth Time ◽  
Coupling Coefficients ◽  
Nonlinear Excitation ◽  
Simple Description ◽  
Wave Decay ◽  
Dispersive Alfvén Wave ◽  
Model Equations

AbstractThis paper presents a simple description of three-wave decay interactions involving a pump dispersive Alfvén wave (DAW), decay DAW and decay slow wave (SW) in a uniform magnetized plasma. When the ponderomotive nonlinearities are incorporated in DAW dynamics, the model equations governing the nonlinear excitation of the SWs by DAW in the low-β plasmas (β ≪ me/mi as applicable to solar corona) are given. The expressions for the coupling coefficients of the three-wave interaction have been derived. The growth rate of the instability is also calculated and found that the value of the decay growth time comes out to be of the order of milliseconds at the pump DAW amplitude B0y/B0 = 10−3.

Correlations Between Dispersive Alfvén Wave Activity, Electron Energization, and Ion Outflow in the Inner Magnetosphere

2020 ◽  
Vol 47 (17) ◽  
Author(s):  
A. J. Hull ◽  
C. C. Chaston ◽  
J. W. Bonnell ◽  
P. A. Damiano ◽  
J. R. Wygant ◽  
...  
Keyword(s):  
Wave Activity ◽  
Alfven Wave ◽  
Ion Outflow ◽  
Inner Magnetosphere ◽  
Dispersive Alfvén Wave

Magnetic-moment field generation in the reflection region in a cold magnetized plasma

1993 ◽  
Vol 50 (2) ◽  
pp. 191-199 ◽  
Author(s):  
Chandra Das ◽  
B. Bera ◽  
B. Chakraborty ◽  
Manoranjan Khan
Keyword(s):  
Magnetic Moment ◽  
Mass Density ◽  
Magnetized Plasma ◽  
Alfven Wave ◽  
Circularly Polarized ◽  
Electrons And Ions ◽  
Induced Field ◽  
Bound Electrons ◽  
Resonant Generation ◽  
Special Case

Magnetization due to a magnetic moment contributes to the non-oscillating magnetic field in a plasma. The dynamics ofclassically bound electrons in the presence of an applied circularly polarized strong electromagnetic field in the reflection region generates this field. The special case of its resonant generation when the frequency of a right circularlypolarized wave is equal to the ion gyration frequency is studied here. Another source of non-oscillating magnetization isthe interaction of electromagnetic fields, including fields in the Alfvén-wave frequency range, with a cold collisionless fully ionized magnetized plasma also in the reflection region. The induced field from a left circularly polarized field at Alfvén-wave frequencies is paramagnetic, inversely proportional to the square of the ambient field and independent of the mass per particle of both electrons and ions. The induced field from a right circularly polarized field at Alfvén-wave frequencies is diamagnetic, inversely proportional to the cube of the ambient field and depends directly on the plasma mass density.

scholarly journals Ionospheric control of space weather

2021 ◽  
Vol 39 (3) ◽  
pp. 455-460
Author(s):  
Osuke Saka
Keyword(s):  
Phase Space ◽  
Electric Fields ◽  
Charge Separation ◽  
Substorm Onset ◽  
Auroral Ionosphere ◽  
Polar Ionosphere ◽  
Electrons And Ions ◽  
Cold Electrons ◽  
Local Accumulation ◽  
Characteristic Process

Abstract. As proposed by Saka (2019), plasma injections arising out of the auroral ionosphere (ionospheric injection) are a characteristic process of the polar ionosphere at substorm onset. The ionospheric injection is triggered by westward electric fields transmitted from the convection surge in the magnetosphere at field line dipolarization. Localized westward electric fields result in local accumulation of ionospheric electrons and ions, which produce local electrostatic potentials in the auroral ionosphere. Field-aligned electric fields are developed to extract excess charges from the ionosphere. This process is essential to the equipotential equilibrium of the auroral ionosphere. Cold electrons and ions that evaporate from the auroral ionosphere by ionospheric injection tend to generate electrostatic parallel potential below an altitude of 10 000 km. This is a result of charge separation along the mirror fields introduced by the evaporated electrons and ions moving earthward in phase space.

The dispersive Alfvén wave in the time-stationary limit with a focus on collisional and warm-plasma effects

2008 ◽  
Vol 15 (5) ◽  
pp. 052108 ◽  
Author(s):  
S. M. Finnegan ◽  
M. E. Koepke ◽  
D. J. Knudsen
Keyword(s):  
Alfven Wave ◽  
Plasma Effects ◽  
Warm Plasma ◽  
Dispersive Alfvén Wave
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