Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.222..113s&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 222, no. 1-2, p. 113-125
Astronomy and Astrophysics
Astrophysics
Cometary Magnetospheres, Halley'S Comet, Magnetohydrodynamics, Nonlinearity, Plasma Density, Eigenvalues, Eigenvectors, Lorentz Force, Magnetic Fields, Perturbation, Ripples
Scientific paper
Weakly nonlinear Magneto Hydrodynamic (MHD) stability of the Halley cometosheath determined by the balance between the outward ion-neutral drag force and the inward Lorentz force is investigated including the transverse plasma motion as observed in the flanks with the help of the method of multiple scales. The eigenvalues and the eigenfunctions are obtained for the linear problem and the time evolution of the amplitude is obtained using the solvability condition for the solution of the second order problem. The diamagnetic cavity boundary and the adjacent layer of about 100 km thickness is found unstable for the travelling waves of certain wave numbers. Halley ionopause has been observed to have strong ripples with a wavelength of several hundred kilometers. It is found that nonlinear effects have stabilizing effect.
Srivastava Krishna M.
Tsurutani Bruce T.
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