arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2009.06969astro-ph.SRastro-ph.HEastro-ph.IM
收藏

通过太阳两极磁区纬度变化的发电机饱和

Dynamo saturation through the latitudinal variation of bipolar magnetic regions in the Sun

Bidya Binay Karak

摘要:

对太阳磁周期的观测表明,周期的振幅在过去并没有一直增长。因此,必须有一种机制来阻止太阳磁场的增长。我们证明了一个最近提出的机制,这在Babcock-Leighton发电机框架下,这被认为是目前最有前途的范例太阳磁场的产生。这一机制是基于这样一个观测事实:较强的太阳活动周期在高纬度地区产生双极磁区,因此比较弱的太阳活动周期具有更高的平均纬度。我们在我们的三维巴布科克-莱顿太阳发电机模型中捕捉到这种效应,并表明当环形磁场试图增长时,它会在较高纬度产生BMR。在高纬度的BMR产生一个较小的极向场,从而限制了我们的模型中的磁场的整体增长。因此,我们的研究表明BMR的纬度变化是限制太阳磁场增长的潜在机制。

英文摘要:

Observations of the solar magnetic cycle showed that the amplitude of the cycle did not grow all the time in the past. Thus, there must be a mechanism to halt the growth of the magnetic field in the Sun. We demonstrate a recently proposed mechanism for this under the Babcock--Leighton dynamo framework, which is believed to be the most promising paradigm for the generation of the solar magnetic field at present. This mechanism is based on the observational fact that the stronger solar cycles produce bipolar magnetic regions (BMRs) at higher latitudes and thus have higher mean latitudes than the weaker ones. We capture this effect in our three-dimensional Babcock--Leighton solar dynamo model and show that when the toroidal magnetic field tries to grow, it produces BMRs at higher latitudes. The BMRs at higher latitudes generate a less poloidal field, which consequently limits the overall growth of the magnetic field in our model. Thus, our study suggests that the latitudinal variation of BMRs is a potential mechanism for limiting the magnetic field growth in the Sun.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑