Daniel F. Ryan, Paolo Massa, Andrea F. Battaglia, Ewan C. M. Dickson, Yang Su, Wei Chen, Säm Krucker
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引用次数: 0
摘要
ASO-S 上的 HXI 和太阳轨道器上的 STIX 是首个同时运行的太阳硬 X 射线成像分光计。ASO-S 的低地球轨道和太阳轨道器与日地线的周期性位移首次实现了多视角太阳硬 X 射线光谱成像分析。在此,我们报告了对 SOL2023-12-31T21:55 X5 耀斑中的硬 X 射线源进行三维三角测量的首批结果,从而展示了这一新功能的潜力。HXI 和 STIX 以 18° 的观测者分离角观测了耀斑的东边缘附近。我们对每个光源中最亮的区域进行了三角测量,从而确定了耀斑的大尺度硬 X 射线几何特征。结果发现,脚点位于色球层内,不确定度在预期范围内,而热环顶源的中心高度为 15.1 ± 1 毫米。考虑到脚点距离,这意味着磁环结构比半圆模型预测的更长。这些结果表明,HXI 和 STIX 联合观测对了解太阳耀斑的三维几何具有很强的诊断能力。最后,我们讨论了充分挖掘其潜力所需的下一步工作。
Triangulation of Hard X-Ray Sources in an X-Class Solar Flare with ASO-S/HXI and Solar Orbiter/STIX
HXI on ASO-S and STIX onboard Solar Orbiter are the first simultaneously operating solar hard X-ray imaging spectrometers. ASO-S’s low Earth orbit and Solar Orbiter’s periodic displacement from the Sun–Earth line enables multi-viewpoint solar hard X-ray spectroscopic imaging analysis for the first time. Here, we demonstrate the potential of this new capability by reporting the first results of 3D triangulation of hard X-ray sources in the SOL2023-12-31T21:55 X5 flare. HXI and STIX observed the flare near the east limb with an observer separation angle of 18°. We triangulated the brightest regions within each source, which enabled us to characterise the large-scale hard X-ray geometry of the flare. The footpoints were found to be in the chromosphere within uncertainty, as expected, while the thermal looptop source was centred at an altitude of 15.1 ± 1 Mm. Given the footpoint separation, this implies a more elongated magnetic-loop structure than predicted by a semi-circular model. These results show the strong diagnostic power of joint HXI and STIX observations for understanding the 3D geometry of solar flares. We conclude by discussing the next steps required to fully exploit their potential.
期刊介绍:
Solar Physics was founded in 1967 and is the principal journal for the publication of the results of fundamental research on the Sun. The journal treats all aspects of solar physics, ranging from the internal structure of the Sun and its evolution to the outer corona and solar wind in interplanetary space. Papers on solar-terrestrial physics and on stellar research are also published when their results have a direct bearing on our understanding of the Sun.