MHD instability due to non-homogeneity and non-uniformity of magnetic field in gravitating medium and its consequences in the central region of galaxies |
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| Authors: | Z Sarkar R Bondyopadhaya |
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| Institution: | (1) Narula Institute of Technology, Kolkata, 700 109, India;(2) Department of Mathematics, Jadavpur University, Kolkata, 700 032, India |
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| Abstract: | The MHD wave instabilities due to non-uniform magnetic field and non-homogeneity of density have been studied. The reference
(coordinate) system considered here is cylindrical type. The General Dispersion Relation (GDR) for the wave propagation in
a gravitating but non-relativistic region has been derived. Similar to common knowledge, the said non-uniformities have been
found to be responsible for the instability of the system. But interestingly many instability factors are produced due to
presence of two types of non-uniformities simultaneously. This theory may add more clues for the event of instabilities, formation
of hot plasma-bed in Galactic Central Region, and mass out-flow from there. Many conditions for instabilities could be obtained
from GDR deduced here. However, a few conditions for critical wavelength of the MHD wave have been obtained in terms of system
parameters (like gradient of magnetic field and rotation).
This theory, in turn, may be helpful for the better understanding of the Explosion Theory of formation of outer structure
of Galaxies like ours. |
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| Keywords: | MHD instability Galactic central region |
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