9 research outputs found
Mirror instability in a plasma with cold gyrating dust particles
In this work linear stability analysis of a magnetized dusty plasma with an
anisotropic dust component having transversal motions much stronger than
motions parallel to the external magnetic field, and isotropic light plasma
components is described. Such a situation presumably establishes in a shock
compressed space dusty plasma downstream the shock front. Oblique low-frequency
magneto-hydrodynamic waves (, being the
dust cyclotron frequency) are shown to be undergone to the mirror instability.
Consequences for nonthermal dust destruction behind shock fronts in the
interstellar medium are discussed.Comment: 13 pages, 5 figs, accepted to Phys. Pasma
Acceleration of dust particles by low-frequency Alfv\'en waves
We investigate the efficiency of acceleration of charged dust particles by
low-frequency Alfv\'en waves in nonlinear approximation. We show that the
longitudinal acceleration of dust particles is proportional to the square of
the soliton amplitude , while the transversal acceleration is of
. In the conditions of the interstellar medium the resulting velocity
of dust particles can reach 0.3 to 1 km s.Comment: 8 pages, no figs, accepted in Phys. Lett.
Ion-Acoustic Solitons in Bi-Ion Dusty Plasma
The propagation of ion-acoustic solitons in a warm dusty plasma containing
two ion species is investigated theoretically. Using an approach based on the
Korteveg-de-Vries equation, it is shown that the critical value of the negative
ion density that separates the domains of existence of compressi- on and
rarefaction solitons depends continuously on the dust density. A modified
Korteveg-de Vries equation for the critical density is derived in the higher
order of the expansion in the small parameter. It is found that the nonlinear
coefficient of this equation is positive for any values of the dust density and
the masses of positive and negative ions. For the case where the negative ion
density is close to its critical value, a soliton solution is found that takes
into account both the quadratic and cubic nonlinearities. The propagation of a
solitary wave of arbitrary amplitude is investigated by the quasi-potential
method. It is shown that the range of the dust densities around the critical
value within which solitary waves with positive and negative potentials can
exist simultaneously is relatively wide.Comment: 17 pages, 5 figure
Solitary Dust--Acoustic Waves in a Plasma with Two-Temperature Ions and Distributed Grain Size
The propagation of weakly nonlinear dust--acoustic waves in a dusty plasma
containing two ion species with different temperatures is explored. The
nonlinear equations describing both the quadratic and cubic plasma
nonlinearities are derived. It is shown that the properties of dust--acoustic
waves depend substantially on the grain size distribution. In particular, for
solitary dust--acoustic waves with a positive potential to exist in a plasma
with distributed grain size, it is necessary that the difference between the
temperatures of two ion species be large that that in the case of unusized
grains.Comment: 16 pages, 6 figure