On rotational discontinuities in both two-fluid and hybrid models

C. C. Wu, Tohru Hada

Research output: Contribution to journalArticle

Abstract

Rotational discontinuities are studied in a two-fluid model that includes finite ion inertia dispersion and in a hybrid model in which the full ion dynamics is retained while the electrons are treated as a massless fluid. We show that as in previous dissipative MHD studies, a rotational discontinuity is unstable in both models and evolves to a 2 → 3 intermediate shock, a slow rarefaction wave, and other waves. (However, due to the limitation in computational resources, the hybrid calculations are limited to low-to-medium ion beta.) In addition, we show that the so-called Walén relation, which holds exactly for rotational discontinuities, can also be well satisfied by tran-Alfvénic intermediate shocks. Thus intermediate shocks can be candidates for those observed structures that satisfy the Walén relation.
Original languageEnglish
Pages (from-to)3755-3767
Number of pages13
JournalJournal of Geophysical Research
Volume96
Issue number3
Publication statusPublished - 1991

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discontinuity
shock
Ions
ions
Fluids
fluid
ion
fluids
two fluid models
Magnetohydrodynamics
elastic waves
inertia
resources
electrons
electron
Electrons
resource
calculation

Cite this

On rotational discontinuities in both two-fluid and hybrid models. / Wu, C. C. ; Hada, Tohru.

In: Journal of Geophysical Research, Vol. 96, No. 3, 1991, p. 3755-3767.

Research output: Contribution to journalArticle

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AU - Hada, Tohru

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AB - Rotational discontinuities are studied in a two-fluid model that includes finite ion inertia dispersion and in a hybrid model in which the full ion dynamics is retained while the electrons are treated as a massless fluid. We show that as in previous dissipative MHD studies, a rotational discontinuity is unstable in both models and evolves to a 2 → 3 intermediate shock, a slow rarefaction wave, and other waves. (However, due to the limitation in computational resources, the hybrid calculations are limited to low-to-medium ion beta.) In addition, we show that the so-called Walén relation, which holds exactly for rotational discontinuities, can also be well satisfied by tran-Alfvénic intermediate shocks. Thus intermediate shocks can be candidates for those observed structures that satisfy the Walén relation.

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