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Vývoj meziplanetární rázové vlny v přechodové oblasti
Koval, A. ; Šafránková, J. ; Němeček, Z. ; Přech, L. ; Hayosh, Mykhaylo
Propagation of an interplanetary shock through the solar wind and magnetosheath is studied. The data from spacecraft allows determining both local and global shock planes and shock propagation speeds in the solar wind as well as local shock parameters in the magnetosheath. A mutual comparison of these parameters indicates that the shock front decelerates and curves in the magnetosheats. Magnetic field and plasma parameters are well reproduced by 3D MHD BARTS-R-US model.
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Analytical approaches of local stability investigation applied to piecewise linear vibrating system - Kelvin-Voigt impact oscillator
Kocanda, Lubomír
Dynamical behaviour of soft impact oscillator is multifarious with plenty of manifold behaviour kinds commensurated with system parameters. The stability analysis of soft impact oscillator is very important for dynamic investigation. Floquet theory or Ljapunov exponent approach can be applied in numerical integration. However, contrary to numerical integration results processing, the analytic-numerical approaches give better view of the dynamical nub despite its' facing mutual very diverse terms. Approaches based on eigenvalue problem and small difference method presented in authors past papers are eked out with this contribution. This paper aim is to obtain the result of the local stability investigation approaches in analytical form.
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