Propagation of slow MHD waves along the dipole magnetic tubes

Vladimir A. Shaidurov; Nikolai V. Erkaev

doi:10.1117/12.458487

28 February 2002 Propagation of slow MHD waves along the dipole magnetic tubes

Vladimir A. Shaidurov, Nikolai V. Erkaev

Proceedings Volume 4678, Eighth International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; (2002) https://doi.org/10.1117/12.458487
Event: Eighth Joint International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 2001, Irkutsk, Russian Federation

Abstract

Variations of plasma pressure in a magnetic flux tube can produce MHD waves evolving into shocks. In the case of low plasma beta, the plasma pressure pulses in the magnetic flux tube generates MHD slow shocks propagating along the tube. In the case of converging magnetic field lines, like in a dipole magnetic field, the cross section of a magnetic flux tube decreases enormously with increasing magnetic field strength. In such a case, the propagation of MHD waves along the magnetic flux tubes is rather different from that in the case of uniform magnetic field. The propagation of MHD slow shocks is studied numerically using an ideal MHD equations in an approximation suitable for a thin magnetic flux tube. In this approximation, the total pressure (sum of magnetic and plasma pressures), is a known function of the distance along the tube. Numerical method used for calculations is based on a conservative finite difference numerical scheme in material coordinates. The result obtained in the numerical study show that the intensity of the slow shock increases very much while the shock is propagating along the narrowing magnetic flux tube towards a region of a strong magnetic field.

Citation Download Citation

Vladimir A. Shaidurov and Nikolai V. Erkaev "Propagation of slow MHD waves along the dipole magnetic tubes", Proc. SPIE 4678, Eighth International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, (28 February 2002); https://doi.org/10.1117/12.458487

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KEYWORDS

Magnetism

Plasma

Wave propagation

Planets

Distance measurement

Ions

Jupiter

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