Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций
Конференция: International Symposium on Atmospheric and Ocean Optics - Atmospheric Physics; IRKUTSK, RUSSIA; IRKUTSK, RUSSIA
Год издания: 2002
Идентификатор DOI: 10.1117/12.458487
Ключевые слова: magnetosphere; magnetohydrodynamics; plasma; flux tubes; slow waves; shocks
Аннотация: 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 sectiПоказать полностьюon 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.
Журнал: EIGHTH INTERNATIONAL SYMPOSIUM ON ATMOSPHERIC AND OCEAN OPTICS: ATMOSPHERIC PHYSICS
Выпуск журнала: Vol. 4678
Номера страниц: 538-544
ISSN журнала: 0277786X
Место издания: BELLINGHAM
Издатель: SPIE-INT SOC OPTICAL ENGINEERING