arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.07111astro-ph.SR
收藏

用SDO和STEREO的立体观测测量稳定的太阳辐射的三维形状

Measuring three-dimensional shapes of stable solar prominences using stereoscopic observations from SDO and STEREO

Chengrui Zhou, Chun Xia, Yuandeng Shen

摘要:

虽然人们已经对太阳爆发的三维形状和轨迹进行了深入的研究,但到目前为止,还没有精确测量爆发前稳定爆发的三维(3D)形状。我们打算进行这样的测量,以约束3D突出模型,并扩展我们的知识的连续性。使用多角度观察从大气成像组件上的SDO和极紫外线成像仪上的STEREO,我们重建了三个稳定的连续性的三维坐标:一个静态的,中间的,和混合型。基于3D坐标,我们测量了这些双足的高度、长度和倾斜角度。为了研究双折射足点和光球磁结构之间的空间关系,我们还使用了SDO上HMI的全球振荡网络H组α图像和磁图。在三个稳定的日珥中,我们发现日珥腿的轴线平均与太阳表面倾斜68度。在日珥轴上不同位置的腿有不同的高度,有两到三倍的差异。我们的研究表明,在一个样本的70个足迹超过96%的突出足迹位于超颗粒边界。两条腿的宽度具有在两条正交视线中测量的相似值。我们还发现,日珥腿以上的太阳边缘表现出较大的振幅在较高的位置水平振荡。在有限的图像分辨率和案例数量下,我们的测量表明,双折射的腿可能有不同的方向,并不总是垂直于太阳表面。此外,日珥支的位置与超颗粒密切相关。

英文摘要:

Although the real shapes and trajectories of erupting solar prominences in three dimensions have been intensively studied, the three-dimensional (3D) shapes of stable prominences before eruptions have not been measured accurately so far. We intend to make such a measurement to constrain 3D prominence models and to extend our knowledge of prominences. Using multiperspective observations from the Atmospheric Imaging Assembly on board SDO and the Extreme Ultraviolet Imager on board STEREO, we reconstructed 3D coordinates of three stable prominences: a quiescent, an intermediate, and a mixed type. Based on the 3D coordinates, we measured the height, length, and inclination angle of the legs of these prominences. To study the spatial relationship between the footpoints of prominences and photospheric magnetic structures, we also used the Global Oscillation Network Group H alpha images and magnetograms from the HMI on board the SDO. In three stable prominences, we find that the axes of the prominence legs are inclined by 68 degrees on average to the solar surface. Legs at different locations along a prominence axis have different heights with a two- to threefold difference. Our investigation suggests that over 96% of prominence footpoints in a sample of 70 footpoints are located at supergranular boundaries. The widths of two legs have similar values measured in two orthogonal lines of sight. We also find that a prominence leg above the solar limb showed horizontal oscillations with larger amplitudes at higher locations. With a limited image resolution and number of cases, our measurement suggests that the legs of prominences may have various orientations and do not always stand vertically on the surface of the sun. Moreover, the locations of prominence legs are closely related to supergranules.

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。

↑