论文标题
2011年2月15日与X2.2太阳能耀斑相关的染色体中3分钟振荡的空间和时间分析
Spatial and temporal analysis of 3-minute oscillations in the chromosphere associated with the X2.2 Solar Flare on 2011 February 15
论文作者
论文摘要
染色体中的3分钟振荡归因于从光球传播的慢磁声波，以及铬球本身在其固有频率内产生的振荡，作为对干扰的响应。在这里，我们介绍了在Soly2011-02-15T01：56 x2.2 Flare之前，之中和之后的色球环3分钟振荡的空间和时间行为的研究。从船上的大气成像组件中获得的1600和1700埃斯特罗姆以1600和1700埃的紫外发射的观察，太阳能动力学观测值用于创建功率图作为空间和时间的函数。我们观察到耀斑期间较高的3分钟功率，在空间上集中在小面积的10像素（4个弧度）之间。这意味着色层等离子体在全球范围内没有作为单个身体振荡。增加3分钟功率的位置与先前研究的HXR耀斑发射的观察结果一致，这表明这些小区域是染色体的表现，这些染色体表现出对非热颗粒注入能量的反应。这支持了这样的理论，即染色体会响应扰动而在声学截止频率下振荡。
3-minute oscillations in the chromosphere are attributed to both slow magnetoacoustic waves propagating from the photosphere, and to oscillations generated within the chromosphere itself at its natural frequency as a response to a disturbance. Here we present an investigation of the spatial and temporal behavior of the chromospheric 3-minute oscillations before, during, and after the SOL2011-02-15T01:56 X2.2 flare. Observations in ultraviolet emission centered on 1600 and 1700 Angstroms obtained at 24- second cadence from the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory are used to create power maps as functions of both space and time. We observe higher 3-minute power during the flare, spatially concentrated in small areas 10 pixels (4 arcseconds) across. This implies that the chromospheric plasma is not oscillating globally as a single body. The locations of increased 3-minute power are consistent with observations of HXR flare emission from previous studies, suggesting that these small areas are manifestations of the chromosphere responding to injection of energy by nonthermal particles. This supports the theory that the chromosphere oscillates at the acoustic cutoff frequency in response to a disturbance.
