Criteria for the stability of a line-tied magnetohydrostatic equilibrium in the solar corona

J. Melville*, A. Hood, E. R. Priest

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Arcades of loop structures in the solar corona have been associated with the onset of solar flares. Changes in the plasma and/or magnetic pressure could initiate a flare if the equilibrium structure becomes unstable. It is shown that for a model magnetohydrostatic equilibrium, if the plasma β > β{black star} where β{black star} is the β-value for which a magnetic island just appears on the photosphere, then the closed field lines and some field lines tied to the photosphere are unstable to localised linear perturbations. If the field remains unsheared by photospheric motions, then the condition β < β{black star} for stability is necessary and sufficient.

Original languageEnglish
Pages (from-to)49-52
Number of pages4
JournalAdvances in Space Research
Volume6
Issue number6
DOIs
Publication statusPublished - 1 Jan 1986

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