Numerical linearized MHD model of flapping oscillations | Zendy

Daniil Korovinskiy | Zendy; Ivan Ivanov | Zendy; V. S. Semenov | Zendy; Н. В. Еркаев | Zendy; S. A. Kiehas | Zendy

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Numerical linearized MHD model of flapping oscillations

Author(s) -

Daniil Korovinskiy,

Ivan Ivanov,

V. S. Semenov,

Н. В. Еркаев,

S. A. Kiehas

Publication year - 2016

Publication title -

physics of plasmas

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.75

H-Index - 160

eISSN - 1089-7674

pISSN - 1070-664X

DOI - 10.1063/1.4954388

Subject(s) - physics , flapping , magnetohydrodynamics , dispersion relation , perturbation (astronomy) , mechanics , magnetic field , current sheet , classical mechanics , eigenfunction , computational physics , quantum electrodynamics , condensed matter physics , quantum mechanics , eigenvalues and eigenvectors , wing , thermodynamics

Kink-like magnetotail flapping oscillations in a Harris-like current sheet with earthward growing normal magnetic field component Bz are studied by means of time-dependent 2D linearized MHD numerical simulations. The dispersion relation and two-dimensional eigenfunctions are obtained. The results are compared with analytical estimates of the double-gradient model, which are found to be reliable for configurations with small Bz up to values ∼0.05 of the lobe magnetic field. Coupled with previous results, present simulations confirm that the earthward/tailward growth direction of the Bz component acts as a switch between stable/unstable regimes of the flapping mode, while the mode dispersion curve is the same in both cases. It is confirmed that flapping oscillations may be triggered by a simple Gaussian initial perturbation of the Vz velocity.

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