Rapid dissipation of magnetic fields due to Hall current

Дата и время публикации : 1999-11-19T22:02:44Z

Авторы публикации и институты :
S. I. Vainshtein
S. M. Chitre
A. V. Olinto

Оригинал статьи :http://arxiv.org/abs/astro-ph/9911386v2

Скачать pdf : http://arxiv.org/pdf/astro-ph/9911386v2

Ссылка на журнал-издание: Phys.Rev. E61 (2000) 4422
Коментарии к статье: 9 pages, changed fig. 3
Первичная категория: astro-ph

Все категории : astro-ph, physics.plasm-ph

Краткий обзор статьи: We propose a mechanism for the fast dissipation of magnetic fields which is effective in a stratified medium where ion motions can be neglected. In such a medium, the field is frozen into the electrons and Hall currents prevail. Although Hall currents conserve magnetic energy, in the presence of density gradients, they are able to create current sheets which can be the sites for efficient dissipation of magnetic fields. We recover the frequency, $omega_{MH}$, for Hall oscillations modified by the presence of density gradients. We show that these oscillations can lead to the exchange of energy between different components of the field. We calculate the time evolution and show that magnetic fields can dissipate on a timescale of order $1/omega_{MH}$. This mechanism can play an important role for magnetic dissipation in systems with very steep density gradients where the ions are static such as those found in the solid crust of neutron stars.

Category: Physics