Space Climate 7:

Space Climate Symposium on July 8-11 , 2019

Space Climate 7 Meeting Abstract

Mean-field modeling of large-scale dynamo in solar-like strongly-stratified convection - the Rossby number dependence -

Youhei MASADA (Aichi University of Education, JAPAN)

Takayoshi SANO, Osaka University, JAPAN

In Masada & Sano (2016, ApJL), we reported the successful simulation of the spontaneous formation of surface magnetic structures from large-scale dynamo in strongly-stratified convection. In this talk, we will present our recent studies on the Rossby number (Ro) dependence of the large-scale dynamo in the strongly-stratified convection. From our parametric survey, we find that the critical Rossby number that separates the success and failure of the large-scale dynamo is in the range 0.02 < Ro < 0.04. It is also found that the Ro-dependence of the large-scale dynamo can be reproduced by the mean-field α^2-type dynamo model constructed with using turbulent velocity profiles extracted from the DNS (see also, Masada & Sano 2014, ApJL). The physics of the Rossby number dependence of the convective dynamo and its application to the solar/stellar dynamo modeling are finally discussed with focusing on the rotational modulation of the profiles of the turbulent transport coefficients.

Mode of presentation: oral (Need to be confirmed by the SOC)

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