Instabilities of self-gravitating dusty clouds in magnetized plasmas

Mamun, A. A.; Shukla, P. K.
September 2000
Physics of Plasmas;Sep2000, Vol. 7 Issue 9
Academic Journal
A rigorous theoretical investigation has been made of electromagnetic modes and associated filamentational instabilities in a nonuniform, partially ionized, self-gravitating, dusty magnetoplasma, taking into account the effects of the neutral fluid dynamics, inhomogeneities in the external magnetic field and the plasma density, the drag forces, the ionization and recombination, etc. It is found that there exist two new types of filamentational instabilities; one type is due to the combined effects of collisions of dust particles or ions with stationary neutrals and the self-gravitational force, and the other type is due to the combined effects of the dusty plasma and the neutral fluid dynamics. Furthermore, the effects of the external magnetic field and its inhomogeneity, the neutral fluid temperature, collisions of dust particles with neutrals, and the ionization play the stabilizing role, whereas the effects of the neutral fluid mass density, the plasma number density inhomogeneity, collisions of ions with neutrals, and the recombination play the destabilizing role. The newly found instabilities may be responsible for the formation of stars in galaxies via fragmentation or filamentation of interstellar dense molecular clouds.© 2000 American Institute of Physics.


Related Articles

  • The Kelvin-Helmholtz instability in a plasma with negatively charged dust. Luo, Q. Z.; D'Angelo, N.; Merlino, R. L. // Physics of Plasmas;Jan2001, Vol. 8 Issue 1, p31 

    The effect of negatively charged dust on the Kelvin-Helmholtz (parallel velocity shear) instability is investigated experimentally in a magnetized cesium plasma. The dust generally has a stabilizing effect on the instability, although, in some cases, the addition of negatively charged dust into...

  • Response to "Comment on 'Instabilities of self-gravitating dusty clouds in magnetized plasmas' " [Phys. Plasmas 8, 1087 (2001)]. Mamun, A. A.; Shukla, P. K. // Physics of Plasmas;Mar2001, Vol. 8 Issue 3, p1090 

    Evaluates the comment by G.E. Ciolek and T.Ch. Mouschovias on the article 'Instabilities of self-gravitating dusty clouds in magnetized plasmas'. Absence of merit in the criticism by Ciolek and Mouschovias; Jeans instability in partially ionized, self-gravitating magnetized plasma; Lack of...

  • Dust-lower-hybrid instability in the presence of dust charge fluctuation in a streaming dusty plasma. Islam, M. K.; Salahuddin, M.; Banerjee, A. K.; Salimullah, M.; Nambu, M. // Physics of Plasmas;Jul2002, Vol. 9 Issue 7, p2971 

    A detailed theoretical investigation has been made on the properties and excitation of low-frequency and low-phase-velocity electrostatic dust-modes in a magnetized dusty plasma including the streaming of ions, dust charge fluctuation, and the kinetic effects using the Vlasov-Poisson analysis....

  • Modulational instability of an electron plasma wave in a dusty plasma. Amin, M.R.; Ferdous, T. // Physics of Plasmas;Mar1997, Vol. 4 Issue 3, p598 

    Investigates the modulational instability of an electron plasma wave in a homogeneous, unmagnetized, hot, and collisionless dusty plasma. Perturbative solution of the Vlasov equation; Nonlinear response of the plasma particles with random static distribution of massive and charged dust grains...

  • Crossfield driven electrostatic instabilities in a two-dust component plasma. Maharaj, S. K.; Bharuthram, R. // AIP Conference Proceedings;2000, Vol. 537 Issue 1, p61 

    Using a kinetic approach, a parametric investigation of electrostatic instabilities is undertaken in a two-dust component plasma comprising of ions, electrons and two dust species (of different mass and charge) in the low dust plasma frequency regime. These instabilities are driven by an equal E...

  • Modulational instability of electrostatic ion-cyclotron waves by dust modes in a magnetoactive dusty plasma. Banerjee, A. K.; Salahuddin, M.; Islam, M. K.; Cairns, R. A.; Salimullah, M. // Physics of Plasmas;Jan2001, Vol. 8 Issue 1, p92 

    A high-amplitude electrostatic ion-cyclotron wave is shown to be unstable against modulational instability by the electrostatic dust modes in a magnetized, homogeneous, and collisional dusty plasma. The presence of the dust component has strong effects on the nonlinear coupling via the dust...

  • Comment on "Instabilities of self-gravitating dusty clouds in magnetized plasmas" [Phys. Plasmas 7, 3762 (2000)]. Ciolek, Glenn E. // Physics of Plasmas;Mar2001, Vol. 8 Issue 3, p1087 

    A study was recently presented on the linear stability of self-gravitating, magnetic interstellar dust clouds, including the effects of fluctuations of the charges of dust grains and collisions with a neutral fluid, and it was suggested that gravitational instability in such systems could lead...

  • Ionization instability in dusty plasmas. D'Angelo, N. // Physics of Plasmas;Sep97, Vol. 4 Issue 9, p3422 

    Examines the ionization instability in a dusty plasma in which the neutral gas is ionized by a constant flux of energetic electrons with energy slightly above the ionization energy by using fluid equations for positive ions, electrons and negatively charged dust grains. Frequency and growth...

  • Parametric excitation of low frequency waves in complex (dusty) plasmas. Yaroshenko, V.; Morfill, G. E. // Physics of Plasmas;Nov2002, Vol. 9 Issue 11, p4495 

    The parametric instability of dust-acoustic as well as dust lattice waves due to periodical modulation of equilibrium dust charges is analyzed. The criterion for and the maximum growth rate of this instability are obtained. It is shown that the parametric resonance of the dust-acoustic or dust...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics