The propagation of slow MHD waves along the dipole magnetic tubes

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 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.

Ссылки на полный текст

Издание

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

Авторы

  • Shaidurov V.A. (KRASNOYARSK STATE UNIV)
  • Erkaev N.V. (KRASNOYARSK STATE UNIV)

Информация о публикациях загружается с сайта службы поддержки публикационной активности СФУ. Сообщите, если заметили неточности.

Вы можете отметить интересные фрагменты текста, которые будут доступны по уникальной ссылке в адресной строке браузера.