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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The average tilt angle of sunspot groups emerging throughout the solar cycledetermines the net magnetic flux crossing the equator, which is correlated withthe strength of the subsequent cycle. I suggest that a deep-seated, non-localprocess can account for the observed cycle-dependent changes in the averagetilt angle. Motivated by helioseismic observations indicating cycle-scalevariations in the sound speed near the base of the convection zone, Idetermined the effect of a thermally perturbed overshoot region on thestability of flux tubes and on the tilt angles of emerging flux loops. I foundthat 5-20 K of cooling is sufficient for emerging flux loops to reproduce thereported amplitude of cycle-averaged tilt angle variations, suggesting that itis a plausible effect responsible for the nonlinearity of the solar activitycycle.

A mechanism for the dependence of sunspot group tilt angles on cycle strength