Dispersion of Long MHD Waves in a Finely Structured Plasma

Maurizio Lontano, Enzo Lazzaro, Dmitri Ryutov

Research output: Contribution to journalArticle


The propagation of long magnetohydrodynamic waves (with wavelength λ) in a plasma characterized by small scale (of the order of a), large amplitude nonuniformities of its density and of the magnetic field is investigated in conditions where λ ≫ a. The introduction of a suitable averaging procedure over an intermediate scale allows one to obtain the relevant dispersion relation for the long waves which manifests new properties with respect to those of a uniform plasma. Moreover, it is shown that, if the plasma nonuniformities are spatially distributed with a broad spectrum, within a finite interval of numerical values, a collisionless mechanism of damping may affect the slow mode. The results of this work are of concern both for astrophysical and laboratory plasmas.
Original languageEnglish
Pages (from-to)52 - 56
Number of pages5
JournalPhysica Scripta
Publication statusPublished - 2000
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics
  • Physics and Astronomy(all)

Cite this

Lontano, M., Lazzaro, E., & Ryutov, D. (2000). Dispersion of Long MHD Waves in a Finely Structured Plasma. Physica Scripta, 84, 52 - 56.