ION ACOUSTIC SOLITARY WAVES IN A SELF- GRAVITATING DUSTY PLASMA CONSISTING OF WEAK NONISOTHERMAL TWO-TEMPERATURE ELECTRONS
SAILENDRA NATH PAUL *
East Kolkata Centre for Science Education and Research, P-1, B.P. Township, Kolkata-700 094, India. and Department of Physics, Jadavpur University, Kolkata-700032, India.
East Kolkata Centre for Science Education and Research, P-1, B.P. Township, Kolkata-700 094, India.
Department of Physics, Jadavpur University, Kolkata-700032, India.
Department of Physics, Sripat Sing College, Jiaganj, West Bengal, India.
*Author to whom correspondence should be addressed.
Ion-acoustic waves in a self-gravitating dusty plasma consisting of warm positive ions, weak- nonisothermal two-temperature electrons and negatively charged dust particles having charge fluctuations has been theoretically investigated using the reductive perturbation method. It has been shown that the nonlinear propagation of ion-acoustic waves in such a plasma can be described by an uncoupled third order partial differential equation which is a modified form of Korteweg-deVries (KdV) equation. From this nonlinear equation, solution of the ion acoustic solitary waves in the dusty plasma having weak nonisothermal electrons is obtained. Moreover, the solitary wave solution for very weak nonisothermality of electrons in gravitating plasma is obtained which is similar to the solution in isothermal electrons. The effects of gravity, two-temperature electrons dust charge fluctuations on the ion acoustic solitary waves for weak nonisothermal as well as very weak nonisothermal two-temperature of electrons are discussed with possible applications in astrophysical plasma.
Keywords: Ion-acoustic waves, gravitating plasma, dust charge fluctuation, two-temperature electrons, weak non-isothermal two-temperature electrons, modified Korteweg-deVries equation