Waves and instabilities in streaming magnetized plasma

Self Cite

Streaming or beam-driven kinetic theory is formulated for a nonrelativistic and collisional plasma diffusing across magnetic field lines, including small density and temperature gradient. Explicit formulas for modified transport coefficients are presented and their dependence on streaming parameter (V0) is discussed both qualitatively and quantitatively, while retaining the exponent in normalization intact. The dramatic results concerning the beam feature reveal that the electrical resistivity (η⊥) and thermal conductivity (K) diminish sharply with the increase in temperature for varying V0 in the limit of T+=T−=108 K; it approaches minimal range to resemble a rectangular hyperbola, while only the thermal conductivity (K) shows a diminishing trend with increasing (V0). The thermoelectric coefficient (λ) is almost independent of temperature, though it increases with increasing streaming.

Section: Basic Theory and Computation Of Transport Coefficientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cross field diffusion and transport in a nonrelativistic beam-driven magnetoplasma: Collisional kinetics

Mohanty¹,

Baral²

2001

Self Cite

“…Equation ͑8͒ is satisfied by the local Maxwellian velocity distribution function. In the model, we choose a proper dissipative equilibrium Maxwellian distribution function, anisotropic in particle velocity distribution, 14,15 incorporating the inequality v 0 2 Ӷu th 2 physical restrictions in the same physical frame or system:…”

Section: Basic Theorymentioning

confidence: 99%

“…Our goal in the present paper is to deal with the interesting aspect of collisional flux diffusion in magnetic field lines, where there is anisotropy in particle energy and momentum distribution system and beam-plasma interaction, as seen in solar flares, sunspots, etc., of natural plasmas. Early works [14][15][16][17] dealt with the streaming plasmas in relativistic and nonrelativistic theories with an emphasis on dispersion or wave propagation. Likewise, nonlinear streaming aspects 18,19 have been covered to a large extent, illustrating chaos or stochastic motion.…”

Section: Introductionmentioning

confidence: 99%

“…So our formalism and analysis involves a purportedly streaming and mass motion mechanism and the evaluation of resulting scattered flux integrals leading to modified transport coefficients inherent with such a beam-plasma interaction. [14][15][16][17][18][19][20][21][22] Diffusion in relativistic theory has been dealt with both for beam and no beam systems. Therefore it is worthwhile to study the remaining aspects of transport diffusion in a beam plasma governed by the nonrelativistic energy regimes and the interesting features of the transport properties implicit in the analysis.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Diffusion and transport phenomena in a two-component singly charged magnetized and anisotropic plasma stream

Mohanty¹,

Baral²

2000

Self Cite

The presence of a beam in an electron-ion plasma embedded in magnetic field lines entails streaming or mass motion of plasma species. It causes a kind of energy dissipation (v 0 "p Ϯ ) in the plasma, where v 0 represents (v 0 Ӷc) streaming velocity of the species in the same frame and system, transverse to the direction of the applied uniform magnetic field. A modified Chapman-Enskog collisional analysis is employed in the calculation of the flux across the magnetic field, assuming a small ratio of gyroradius to the density inhomogeneity scale length and particle mean-free path. Explicit formulas concerning diffusion and modified transport coefficients are analytically derived. The EÃB drift velocity is found to be independent of streaming velocity (v 0 ), and the electrical resistivity ( Ќ ) decreases slowly with increasing v 0 , whereas the thermoelectric coefficient ͑͒ registers marked enhancement; however, the thermal conductivity ͑K͒ decreases slowly with the rise in streaming parameters. In the limit V 0 →O, early nonstreaming results are recovered. It is also found that Ќ , and K all decrease with the increase in thermal energy. In addition, the results are of relevance to solar flares, sunspots, etc., and the influence of streaming in fusion temperature (kT→1 keV) range is equally emphasized.

Electrostatic waves in streaming magnetized plasma: Linearly independent polarized modes

Naik¹,

Mohanty²

2001

Self Cite

The evolution of two linearly independent polarized modes due to transverse propagation of electrostatic waves in a two-component streaming magnetic plasma is analytically studied. The modified frequency spectra reveal that the refractive index and amplification factor markedly increase with the rise in thermal energy, especially in strong magnetic-field lines (B0∼103 kG). However, with the increase in streaming velocity, the refractive index sharply diminishes. In weak magnetic-field lines (B0∼10−2 kG), the refractive index decays with the increase in thermal energy, whereas the amplification shows an increasing trend.