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 Plus annual

Presents the access of premium content as premium feature

Premium Content

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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We revisit the issue of conservation of magnetic helicity and theWoltjer-Taylor relaxation theory in magnetohydrodynamics in the context of weaksolutions. We introduce a relaxed system for the ideal MHD system, whichdecouples the effects of hydrodynamic turbulence such as the appearance of aReynolds stress term from the magnetic helicity conservation in a mannerconsistent with observations in plasma turbulence. As by-products we answer twoopen questions in the field: We show the sharpness of the $L^3$ integrabilitycondition for magnetic helicity conservation and provide turbulent boundedsolutions for MHD dissipating energy and cross helicity but with (arbitrary)constant magnetic helicity.

Magnetic helicity, weak solutions and relaxation of ideal MHD