English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The stratification-driven Hall instability in a weakly ionized polytropicplasma is investigated in the local approximation within an equilibriumKeplerian disk of a small aspect ratio. The leading order of the asymptoticexpansions in the aspect ratio is applied to both equilibrium as well as theperturbation problems. The equilibrium disk with an embedded purely toroidalmagnetic field is found to be stable to radial, and unstable to verticalshort-wave perturbations. The marginal stability surface is found in the spaceof the local Hall and inverse plasma beta parameters, as well as the freeparameter of the model which is related to the total current through the disk.To estimate the minimal values of the equilibrium magnetic field that leads toinstability, the latter is constructed as a sum of a current free magneticfield and the simplest approximation for magnetic field created by adistributed electric current.Comment: 13 pages, 7 figure

Hall Instability of Thin Weakly Ionized Stratified Keplerian Disks