Propagation of waves in a gravitating and rotating anisotropic heat conducting plasma
An inviscid, unbounded, collisionless, gravitating, rotating and heat conducting anisotropic plasma medium which is drifting is considered. The medium is assumed to be embedded in a strong magnetic field. A general dispersion relation is derived using normal mode analysis and its various limiting cases are discussed, compared with similar earlier results for a non-drifting model, and some disagreements are indicated. The dispersion relation reveals the existence of five waves. These different wave modes are discussed in some particular cases analytically. It is found that in the case of parallel propagation all the five waves propagate. When the axis of rotation is across the magnetic field, the modified entropy wave and the modified anisotropic Alfven wave are independent of rotation, gravitation and heat flux. It is shown that the drift velocity has no effect on the stability of these waves but their phase velocities are found to be altered by the drift velocity; the forward propagating modes being increased and the backward modes decreased. The other three waves are affected by gravitation, rotation, drift and parallel component of the heat flux. It is further shown that only two waves propagate in the perpendicular direction. The propagating wave modes in this particular direction are not affected by the drift velocity since wave normal is transverse to the direction of flow.
Keywords: Waves, Instabilities, Rotating, Drift, Gravitating, Anisotropy
The Momona Ethiopian Journal of Science accepts the manuscripts for consideration with the understanding that the manuscript has not been published and is not under consideration for publication elsewhere. Only original articles will be considered for publication if they have been published previously as abstracts, but not if they have been published previously as extended abstract (>1000 words). This applies to both electronic and print versions of the journal. The authors should assign copyright ownership to the Editorial Office of MEJS in the event that the manuscript is accepted for publication in the Momona Ethiopian Journal of Science. All accepted manuscripts must be accompanied by a copyright statement signed by all authors. A copy of the copyright form will be supplied along with the final reviewed version of the manuscript that is sent for final proof- reading. Authors may make multiple copies of the form if necessary and send to the Editorial Office with author’s signature(s) even individually.
All articles published by Momona Ethiopian Journal of Science (MEJS) are Open Access under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0). Under this license, authors retain ownership of the copyright for their content, and anyone can copy, distribute, or reuse articles as long as the author and original source are properly cited. In all these cases for re-use, the authors will be given proper credit to the original publication in MEJS.