Izvorni znanstveni članak
Collective effects of bound electrons, free electrons and ions in wave-plasma interaction
S. N. Paul
; Centre for Science Education and Research, B-4, Shyamali Housing Estate, Salt Lake City, Calcutta - 700064, India; Centre for Plasma Studies, Faculty of Science, Jadavpur University, Calcutta - 700032, India
S. K. Bhattacharya
; Department of Physics, Meghnad Saha Institute of Technology, Near NRI Complex, Calcutta - 700150, India
S. Mondal
; Physical Research Laboratory, Navrangpura, Ahmedabad, India
B. Chakraborti
; Centre for Plasma Studies, Faculty of Science, Jadavpur University, Calcutta - 700032, India
Sažetak
Characteristics of propagation of small-amplitude waves in a cold plasma, assumed to be fluid-like, compressible, and a mixture of populations of weakly bound electrons, free electrons and ions, is studied. For an elliptically polarized wave, we have evaluated (i) the zeroth-harmonic magnetic moment, (ii) the damping factor and cut-off frequency and (iii) the collisional energy absorption. The relative roles of the frequency (ω0) of the bound electrons, the characteristic frequency of free electrons (ωf), the characteristic frequency of bound electrons (ωb) and the resonance condition, where ω0 equals the wave frequency ω, and the effects of the cut-off frequency, is studied. The cut-off frequency has a higher value; in the resonance case (ω 2 = ω 2 0 ) it increases when ω0 is greater than ωf , and decreases when ω0 is less than ωf . The field of magnetic-moment at this resonance is enhanced when ω0 is large compared to ωf . The exchange of energy between the wave field and the constituents of this plasma is considered.
Ključne riječi
bound electrons; wave-plasma interaction; cut-off frequency; field of magnetic moment field
Hrčak ID:
301810
URI
Datum izdavanja:
1.10.2004.
Posjeta: 481 *