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arXiv 2104.14960astro-ph.SRphysics.space-ph
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在太阳风中冕洞子结构的特征:太阳轨道器遥感和现场测量的组合

Signatures of coronal hole substructure in the solar wind: combined Solar Orbiter remote sensing and in situ measurements

T. S. Horbury, R. Laker, L. Rodriguez, K. Steinvall, M. Maksimovic, S. Livi, D. Berghmans, F. Auchere, A. N. Zhukov, Yu. V. Khotyaintsev, L. Woodham, L. Mattein… 展开作者

T. S. Horbury, R. Laker, L. Rodriguez, K. Steinvall, M. Maksimovic, S. Livi, D. Berghmans, F. Auchere, A. N. Zhukov, Yu. V. Khotyaintsev, L. Woodham, L. Matteini, J. Stawarz, T. Woolley, S. D. Bale, A. Rouillard, H. O'Brien, V. Evans, V. Angelini, C. Owen, S. K. Solanki, B. Nicula, D. Muller, I. Zouganelis

摘要:

上下文太阳复杂的日冕是太阳风和行星际磁场的来源。虽然大尺度的形态是很好的理解,日冕性质的变化对行星际介质性质的影响在几度的规模上是未知的。太阳轨道器携带遥感和现场仪器进入太阳系内部,旨在使这些连接比以往任何时候都更好。目的。我们结合遥感和现场测量从太阳轨道器的第一近日点在0.5 AU研究的精细尺度结构的太阳风从赤道边缘的极冕洞的目的是确定的日冕特征,可以解释在现场的变化。方法.我们使用现场测量的磁场,密度和太阳风速度,以确定在航天器上的小时尺度的结构。使用势场源表面映射,我们估计作为时间的函数的测量的太阳风的源位置,并使用EUI图像来隐藏这些太阳源。结果我们确定了小尺度流相互作用的太阳风压缩磁场和密度以及速度的变化,这是与皱纹在日冕洞的边缘尺度上的几度,表明精细尺度的日冕结构可以直接影响太阳风的属性和驱动器内的变化个别流。结论.这项早期分析已经证明了太阳轨道飞行器组合遥感和原位有效载荷的力量,并表明,随着未来近日点的临近,我们将有可能极大地提高我们对精细尺度太阳风结构的日冕来源的了解,这对于理解驱动太阳风的现象并预测其对地球和其他地方的影响都很重要。

英文摘要:

Context. The Sun's complex corona is the source of the solar wind and interplanetary magnetic field. While the large scale morphology is well understood, the impact of variations in coronal properties on the scale of a few degrees on properties of the interplanetary medium is not known. Solar Orbiter, carrying both remote sensing and in situ instruments into the inner solar system, is intended to make these connections better than ever before. Aims. We combine remote sensing and in situ measurements from Solar Orbiter's first perihelion at 0.5 AU to study the fine scale structure of the solar wind from the equatorward edge of a polar coronal hole with the aim of identifying characteristics of the corona which can explain the in situ variations. Methods. We use in situ measurements of the magnetic field, density and solar wind speed to identify structures on scales of hours at the spacecraft. Using Potential Field Source Surface mapping we estimate the source locations of the measured solar wind as a function of time and use EUI images to characterise these solar sources. Results. We identify small scale stream interactions in the solar wind with compressed magnetic field and density along with speed variations which are associated with corrugations in the edge of the coronal hole on scales of several degrees, demonstrating that fine scale coronal structure can directly influence solar wind properties and drive variations within individual streams. Conclusions. This early analysis already demonstrates the power of Solar Orbiter's combined remote sensing and in situ payload and shows that with future, closer perihelia it will be possible dramatically to improve our knowledge of the coronal sources of fine scale solar wind structure, which is important both for understanding the phenomena driving the solar wind and predicting its impacts at the Earth and elsewhere.

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