Solar Orbiter调试阶段STIX X射线微耀斑观测
太阳与恒星天体物理
2021-12-15 v3
摘要
成像X射线光谱仪/望远镜(STIX)是Solar Orbiter上的硬X射线(HXR)仪器,旨在观测4-150 keV范围内广泛耀斑尺度的太阳耀斑。我们报道仪器调试阶段记录的首批STIX微耀斑观测,以探究STIX在其探测极限处的性能。这篇首发结果论文聚焦于2020年6月AR12765中发生的STIX微耀斑的时序与能谱演化,并将STIX测量与GOES/XRS、SDO/AIA及Hinode/XRT进行比较。对于所观测的GOES A与B级微耀斑,STIX最低能段的峰值时间位于耀斑脉冲相,远早于GOES峰值时间。此行为可解释为STIX对较高温度比GOES更敏感,或由于存在延伸至低能段的非热成分。除样本中最大耀斑外,因计数统计有限,该解释无定论。对此最大耀斑,低能峰值时间明确源于热辐射,而较高能段所见非热成分出现更早。这表明经典热解释也可能适用于大多数较小耀斑。结合EUV与SXR观测,STIX证实了早先等温假设有效性有限的结果。未来诊断工作应聚焦多波段研究,以推导宽温区的微分发射测度分布,从而准确描述太阳耀斑的能量学。调试观测确认STIX按设计工作。经验而言,STIX可探测小至GOES A级的耀斑。对于GOES B级以上的耀斑,可进行详细的能谱与成像分析。
引用
@article{arxiv.2106.10058,
title = {STIX X-ray microflare observations during the Solar Orbiter commissioning phase},
author = {Andrea Francesco Battaglia and Jonas Saqri and Paolo Massa and Emma Perracchione and Ewan C. M. Dickson and Hualin Xiao and Astrid M. Veronig and Alexander Warmuth and Marina Battaglia and Gordon J. Hurford and Aline Meuris and Olivier Limousin and László Etesi and Shane A. Maloney and Richard A. Schwartz and Matej Kuhar and Frederic Schuller and Valliappan Senthamizh Pavai and Sophie Musset and Daniel F. Ryan and Lucia Kleint and Michele Piana and Anna Maria Massone and Federico Benvenuto and Janusz Sylwester and Michalina Litwicka and Marek Stęślicki and Tomasz Mrozek and Nicole Vilmer and František Fárník and Jana Kašparová and Gottfried Mann and Peter T. Gallagher and Brian R. Dennis and André Csillaghy and Arnold O. Benz and Säm Krucker},
journal= {arXiv preprint arXiv:2106.10058},
year = {2021}
}
备注
19 pages, 11 figures