Magnetohydrodynamic modes of a periodic magnetic medium

✍ Scribed by R. Berton; J. Heyvaerts

• Book ID: 104649258
• Publisher: Springer
• Year: 1987
• Tongue: English
• Weight: 1022 KB
• Volume: 109
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00160649

✦ Synopsis

The oscillations of a magnetic medium periodic in the x-direction with B parallel to z, have been studied. The case with no gravity and a stepwise profile for B(x), allowing a normal mode analysis, has been examined and dispersion relations have been derived. The dispersion curves in the diagram k~ -co display two types of modes, kink and sausage, like in the isolated slab, but the profiles are different and depend on Bloeh's number k 0. Moreover, modes usually absent in the isolated slab (propagating and tunelling) appear here, connecting surface-or body-wave domains. The detectability of this characteristic structure of the diagnostic diagram on the observations is discussed, and prospects for a more realistic analysis including gravity are given.