Stellar coronal response to differential rotation and flux emergence

Stellar coronal response to differential rotation and flux emergence
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恒星日冕对差异旋转和通量出现的响应

DOI:
10.1093/mnras/stv2920
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发表时间:
2016
影响因子:
4.8
通讯作者:
Gibb G
Gibb G
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gibb G

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我们进行了数值参数研究,以确定变化的微分旋转和通量出现对恒星非势日冕磁场的影响。我们特别考虑了对恒星表面磁通量、开放磁通量、平均方位场强、日冕自由磁能、日冕加热和通量绳喷发的影响。为此,我们应用磁通输运模型来描述光球演化,并使用磁摩擦技术将其与非势日冕演化耦合。应用磁通涌现模型将新的磁通添加到光球和日冕中。该通量涌现模型的参数来自太阳通量涌现廓线,但涌现率可以提高,以表示比太阳更高的通量涌现率。总的来说,我们发现与差速旋转相比,通量涌现对非势日冕性质的影响更大,所有上述性质都随着通量涌现率的增加而增加。虽然与通量出现相比,差速旋转对日冕整体特性的影响较小,但不同的差速旋转确实改变了日冕的结构。随着差旋转速率的增加,电晕变得更加开放,并且更加非电势。
We perform a numerical parameter study to determine what effect varying differential rotation and flux emergence has on a star's non-potential coronal magnetic field. In particular we consider the effects on the star's surface magnetic flux, open magnetic flux, mean azimuthal field strength, coronal free magnetic energy, coronal heating and flux rope eruptions. To do this, we apply a magnetic flux transport model to describe the photospheric evolution, and couple this to the non-potential coronal evolution using a magnetofrictional technique. A flux emergence model is applied to add new magnetic flux on to the photosphere and into the corona. The parameters of this flux emergence model are derived from the solar flux emergence profile, however the rate of emergence can be increased to represent higher flux emergence rates than the Sun's. Overall we find that flux emergence has a greater effect on the non-potential coronal properties compared to differential rotation, with all the aforementioned properties increasing with increasing flux emergence rate. Although differential rotation has a lesser effect on the overall coronal properties compared to flux emergence, varying differential rotation does alter the coronal structure. As the differential rotation rate increases, the corona becomes more open, and more non-potential.
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发表时间: 2011
影响因子: 4.8
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