Ion-neutral collision effect on an Alfvén wave

Yoshimitsu Amagishi, Masayoshi Tanaka

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


This paper reports that ion-neutral collisions in a magnetized plasma cause a drastic change in the dispersion relation of the shear Alfvén wave with poloidal mode number m=0, connecting to the branch of the m=+1 compressional Alfvén wave at frequencies below the ion-cyclotron frequency. An anomaly of the dispersion then appears on the refractive index curve and a wave packet in this frequency range undergoes strong amplitude damping and profile deformation. It is confirmed that the Kramers-Kronig relation holds for the dielectric function, estimated from both the measured refractive index and damping rate.

Original languageEnglish
Pages (from-to)360-363
Number of pages4
JournalPhysical review letters
Issue number3
Publication statusPublished - 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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