khurshed alam - Academia.edu (original) (raw)
Uploads
Papers by khurshed alam
Astrophysics and Space Science, 1998
Propagation of waves in a magnetized dusty plasma are studied for all the range of values of ion-... more Propagation of waves in a magnetized dusty plasma are studied for all the range of values of ion-cyclotron frequency, and having streams of electrons and ions. The dispersion relation is obtained for the waves propagating through the dusty plasma and analysed for different modes of propagation for relative abundance of dust in the plasma. It is observed that abundance of dust, streaming motions of electrons and ions have an important influence on the propagation of waves in the dusty plasma particularly when the phase velocity of the wave is in the low frequency region.
An analysis of nonlinear waves in a low-frequency low-β magnetized plasma is performed in a modif... more An analysis of nonlinear waves in a low-frequency low-β magnetized plasma is performed in a modified approach. Two different nonlinear equations are deduced, having both solitary-wave-type and kink-type solutions. The solitary wave propagates obliquely to a static magnetic field. It is observed that both the current and magnetic field show the form of solitary and kink structure. Physical relevance of such nonlinear excitations is discussed. PACS numbers: 02.30.Jr, 52.35.-g UDC 530.182, 531.742 Keywords: low-β magnetized plasma, low-frequency waves, solitary wave, kink-type solution, nonlinear excitations in static magnetic field FIZIKA A 7 (1998) 4, 193-204
International Journal of Theoretical Physics, 1999
The properties of waves propagating in amagnetized dusty plasma are analyzed for both high andlow... more The properties of waves propagating in amagnetized dusty plasma are analyzed for both high andlow values of the ion-cyclotron frequency. The electronsare considered to be hot. The dispersion relation for a wave propagating through the dusty plasmaat an arbitrary angle with the external magnetic fieldis derived. This rectifies some errors in the earliertreatment of Cramer and Vladimirov (1996). Effects of the presence of the dust on thecharacteristics of wave propagation arediscussed.
Astrophysics and Space Science, 1998
Propagation of waves in a magnetized dusty plasma are studied for all the range of values of ion-... more Propagation of waves in a magnetized dusty plasma are studied for all the range of values of ion-cyclotron frequency, and having streams of electrons and ions. The dispersion relation is obtained for the waves propagating through the dusty plasma and analysed for different modes of propagation for relative abundance of dust in the plasma. It is observed that abundance of dust, streaming motions of electrons and ions have an important influence on the propagation of waves in the dusty plasma particularly when the phase velocity of the wave is in the low frequency region.
An analysis of nonlinear waves in a low-frequency low-β magnetized plasma is performed in a modif... more An analysis of nonlinear waves in a low-frequency low-β magnetized plasma is performed in a modified approach. Two different nonlinear equations are deduced, having both solitary-wave-type and kink-type solutions. The solitary wave propagates obliquely to a static magnetic field. It is observed that both the current and magnetic field show the form of solitary and kink structure. Physical relevance of such nonlinear excitations is discussed. PACS numbers: 02.30.Jr, 52.35.-g UDC 530.182, 531.742 Keywords: low-β magnetized plasma, low-frequency waves, solitary wave, kink-type solution, nonlinear excitations in static magnetic field FIZIKA A 7 (1998) 4, 193-204
International Journal of Theoretical Physics, 1999
The properties of waves propagating in amagnetized dusty plasma are analyzed for both high andlow... more The properties of waves propagating in amagnetized dusty plasma are analyzed for both high andlow values of the ion-cyclotron frequency. The electronsare considered to be hot. The dispersion relation for a wave propagating through the dusty plasmaat an arbitrary angle with the external magnetic fieldis derived. This rectifies some errors in the earliertreatment of Cramer and Vladimirov (1996). Effects of the presence of the dust on thecharacteristics of wave propagation arediscussed.