Nonlinear coupling of left and right handed circularly polarized dispersive Alfvén wave

2014 ◽  
Vol 21 (7) ◽  
pp. 072307
Author(s):  
R. P. Sharma ◽  
Swati Sharma ◽  
Nidhi Gaur
Keyword(s):  
Alfven Wave ◽  
Nonlinear Coupling ◽  
Circularly Polarized ◽  
Left And Right ◽  
Dispersive Alfvén Wave

scholarly journals Field Localization and Density Cavitation in Low-Beta Plasmas

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Motilal Rinawa ◽  
Prashant Chauhan ◽  
Sintu Kumar ◽  
Manoj Kumar Singh ◽  
Hari Kumar Singh ◽  
...  
Keyword(s):  
Ponderomotive Force ◽  
Space Plasma ◽  
Density Fluctuations ◽  
Alfven Wave ◽  
Nonlinear Coupling ◽  
Auroral Region ◽  
Filamentous Structure ◽  
Inertial Alfvén Wave ◽  
Turbulent Spectrum ◽  
Field Localization

In the present paper, filamentous structure formation, associated turbulent spectrum, and density cavity formation phenomena have been investigated for low- β plasma β ≪ m e / m i applicable to the auroral region. A set of dimensionless equations governing the dynamics of three dimensionally propagating inertial Alfvén wave (3D-IAW) and perpendicularly propagating magnetosonic wave (PMSW) has been developed. Ponderomotive force due to 3D-IAW has been included in the dynamics of the PMSW. Numerical simulation has been performed to study the nonlinear coupling of these two waves. From the obtained results, we found that the field intensity localization takes place which may further lead to the additional dissipation/turbulence process for particle heating and acceleration in space plasma. The associated turbulent spectrum is obtained with scaling nearly k − 4.28 at smaller scales (in the dissipation range). Relevance of the obtained results with the observations reported by various spacecrafts such as Hawkeye and Heos 2 has been discussed. Also, density fluctuations (depletion) of ∼ 0.10   n 0 are calculated, which are consistent with the FAST spacecraft observation reported.

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

Design of Reconfigurable Patch Antenna in Frequency, Pattern, and Switchable Polarization

2020 ◽  
Vol 35 (9) ◽  
pp. 1037-1046
Author(s):  
Yan Zhang ◽  
Da Sun ◽  
Tao Dong ◽  
Jie Yin
Keyword(s):  
Transmission Lines ◽  
Patch Antenna ◽  
Tuning Range ◽  
Frequency Tuning ◽  
Bottom Layer ◽  
Frequency Pattern ◽  
Pin Diodes ◽  
Circularly Polarized ◽  
Left And Right ◽  
Switchable Polarization

In this paper, a circularly polarized frequency, pattern, and polarization switching antenna is proposed. The antenna consists of an octagonal patch, a narrow octagonal ring and four diamond-shaped parasitic patches on the top layer. Two feed points of the radiating patch are connected to a Wilkinson power divider loaded with the phase reconfigurable transmission lines on the bottom layer. Reconfiguration of the polarization and pattern is realized by using PIN diodes as switching components. By controlling the bias voltage across the varactors, various narrow frequency bands can be achieved. The proposed antenna operates at a frequency tuning range from 1.96 to 2.03 GHz. The radiation pattern can be switched among five cases in yoz-plane and xoz-plane, with the switchable polarization between left- and right-hand circular polarization. In addition, these three types of reconfiguration can be controlled independently.

Particle-in-cell simulation for parametric decays of a circularly polarized Alfvén wave in relativistic thermal electron-positron plasma

2014 ◽  
Vol 21 (3) ◽  
pp. 032102 ◽  
Author(s):  
Rodrigo A. López ◽  
Víctor Muñoz ◽  
Adolfo F. Viñas ◽  
J. Alejandro Valdivia
Keyword(s):  
Alfven Wave ◽  
Thermal Electron ◽  
Circularly Polarized ◽  
Particle In Cell ◽  
Electron Positron ◽  
Cell Simulation

scholarly journals The 2(2S + 1)-formalism and its connection with other descriptions

2016 ◽  
Vol 13 (04) ◽  
pp. 1650036
Author(s):  
Valeriy V. Dvoeglazov
Keyword(s):  
Conserved Quantities ◽  
Field Function ◽  
Circularly Polarized ◽  
Massless Field ◽  
Left And Right ◽  
Dynamical Invariants ◽  
Circularly Polarized Radiation ◽  
New Interpretation ◽  
Text Component ◽  
Polarized Radiation

In the framework of the Joos–Weinberg [Formula: see text]-theory for massless particles, the dynamical invariants have been derived from the Lagrangian density which is considered to be a 4-vector. A la Majorana interpretation of the 6-component “spinors”, the field operators of [Formula: see text] particles, as the left- and right-circularly polarized radiation, leads us to the conserved quantities which are analogous to those obtained by Lipkin and Sudbery. The scalar Lagrangian of the Joos–Weinberg theory is shown to be equivalent to the Lagrangian of a free massless field, introduced by Hayashi. As a consequence of a new “gauge” invariance this skew-symmetric field describes physical particles with the longitudinal components only. The interaction of the spinor field with the Weinberg’s [Formula: see text]-component massless field is considered. New interpretation of the Weinberg field function is proposed.

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