论文标题
在用虹膜观察到的磁重新连接期间，微型太阳耀斑的多热气大气
Multi thermal atmosphere of a mini solar flare during magnetic reconnection observed with IRIS
论文作者
论文摘要
其高空间和时间分辨率的界面区域成像光谱仪（IRIS）在磁重新连接过程中带来了太阳能球和冠状活性的异常等离子体诊断。这项工作的目的是研究在喷气底座上血浆的精细结构和动力学，在用虹膜和太阳能动力学观测器（SDO）观察到的两个新兴磁通（EMF）之间形成微型耀斑。我们对Mg II，C II和SI IV离子的光谱范围内观察到的虹膜光谱进行时空分析。使用云模型技术计算来自Mg II线的多普勒速度。强烈的不对称MG II和C II线轮廓具有在重新连接位点观察到的伸展蓝色机翼（喷气基底）的伸展蓝翼，这是通过存在两个色球温度云的存在来解释的，一种爆炸性云，蓝色为290 km/s，一个云，一个云，具有较小的多普勒速度（约36 km/s）。在同一位置（喷射底座），几个过渡区域线（例如O IV和SI IV）的强发射，Balmer-Continuum的Mg II三重三线发射以及在SI IV宽轮廓中鉴定出的色层线的吸收。这种对虹膜线和连续排放的观察结果使我们能够在重新连接电流纸中为白色轻型迷你耀斑大气层提出一个白色迷你耀斑大气的分层模型。这是我们第一次使用云模型技术量化垂直于射流方向的凉爽云的快速速度（可能是Alfvénic流）。我们猜想弹出的云来自血浆，该等离子体在重新连接前被困在两个EMF之间，或者是由色球温度（凉爽）上流材料（如在重新连接期间）等潮流引起的
The Interface Region Imaging Spectrograph(IRIS) with its high spatial and temporal resolution brings exceptional plasma diagnostics of solar chromospheric and coronal activity during magnetic reconnection. The aim of this work is to study the fine structure and dynamics of the plasma at a jet base forming a mini flare between two emerging magnetic fluxes (EMFs) observed with IRIS and the Solar Dynamics Observatory (SDO) instruments. We proceed to a spatio-temporal analysis of IRIS spectra observed in the spectral ranges of Mg II, C II, and Si IV ions. Doppler velocities from Mg II lines are computed by using a cloud model technique. Strong asymmetric Mg II and C II line profiles with extended blue wings observed at the reconnection site (jet base) are interpreted by the presence of two chromospheric temperature clouds, one explosive cloud with blueshifts at 290 km/s and one cloud with smaller Dopplershift (around 36 km/s). Simultaneously at the same location (jet base), strong emission of several transition region lines (e.g. O IV and Si IV), emission of the Mg II triplet lines of the Balmer-continuum and absorption of identified chromospheric lines in Si IV broad profiles have been observed and analysed. Such observations of IRIS line and continuum emissions allow us to propose a stratification model for the white-light mini flare atmosphere with multiple layers of different temperatures along the line of sight, in a reconnection current sheet. It is the first time that we could quantify the fast speed (possibly Alfvénic flows) of cool clouds ejected perpendicularly to the jet direction by using the cloud model technique. We conjecture that the ejected clouds come from plasma which was trapped between the two EMFs before reconnection or be caused by chromospheric-temperature (cool) upflow material like in a surge, during reconnection
