Inversion for Inferring Solar Meridional Circulation: The Case with Constraints on Angular Momentum Transport inside the Sun

被引:0
作者
Hatta, Yoshiki [1 ,2 ]
Hotta, Hideyuki [1 ]
Sekii, Takashi [2 ,3 ]
机构
[1] Nagoya Univ, Inst Space Earth Environm Res, Furo Cho,Chikusa Ku, Nagoya, Aichi 4648601, Japan
[2] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
[3] Grad Univ Adv Studies, Astron Sci Program, SOKENDAI, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
关键词
TIME-DISTANCE HELIOSEISMOLOGY; DIFFERENTIAL ROTATION; CONVECTION ZONE; FLUX TRANSPORT; FLOW; DYNAMO; SDO/HMI; MODEL; CELL;
D O I
10.3847/1538-4357/ad596c
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have carried out inversions of travel times as measured by Gizon et al. to infer the internal profile of the solar meridional circulation (MC). A linear inverse problem has been solved by the regularized least-squares method with a constraint that the angular momentum (AM) transport by MC should be equatorward (HK21-type constraint). Our motivation for using this constraint is based on the result by Hotta & Kusano (hereafter HK21), where the solar equator-fast rotation was reproduced successfully without any manipulation. The inversion result indicates that the MC profile is a double-cell structure if the so-called HK21 regime, in which AM transported by MC sustains the equator-fast rotation, correctly describes the physics inside the solar convective zone. The sum of the squared residuals computed with the inferred double-cell MC profile is comparable to that computed with the single-cell MC profile obtained when we exclude the HK21-type constraint, showing that both profiles can explain the data more or less at the same level. However, we also find that adding the HK21-type constraint degrades the resolution of the averaging kernels. Although it is difficult for us to determine the large-scale morphology of the solar MC at the moment, our attempt highlights the relevance of investigating the solar MC profile from both theoretical and observational perspectives.
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页数:16
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