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

Meridional circulation is an important ingredient in flux transport dynamomodels. We have studied its importance on the period, the amplitude of thesolar cycle, and also in producing Maunder-like grand minima in these models.First, we model the periods of the last 23 sunspot cycles by varying themeridional circulation speed. If the dynamo is in a diffusion-dominated regime,then we find that most of the cycle amplitudes also get modeled up to someextent when we model the periods. Next, we propose that at the beginning of theMaunder minimum the amplitude of meridional circulation dropped to a low valueand then after a few years it increased again. Several independent studies alsofavor this assumption. With this assumption, a diffusion-dominated dynamo isable to reproduce many important features of the Maunder minimum remarkablywell. If the dynamo is in a diffusion-dominated regime, then a slowermeridional circulation means that the poloidal field gets more time to diffuseduring its transport through the convection zone, making the dynamo weaker.This consequence helps to model both the cycle amplitudes and the Maunder-likeminima. We, however, fail to reproduce these results if the dynamo is in anadvection-dominated regime.

Importance of Meridional Circulation in Flux Transport Dynamo: The Possibility of a Maunder-like Grand Minimum