arXiv 1908.113692019-08-29astro-ph.SR

太阳活动区11092冕环温度的提取

Extracting the Temperature of a Coronal Loop in the Solar Active Region 11092

Narges Fathalian

备注：: 12 pages, 6 figures

摘要：

日冕环温度的提取是分析太阳活动区日冕环的有效方法，有助于更好地理解日冕事件。为此，已经开发了各种方法，如Aschwanden等人2015 \cite{AschwandenB2015}开发的方法，该方法基于差分发射测量（DEM）的高斯拟合。在这里，我们使用三个不同波长的图像的强度比和AIA的温度响应函数来提取环的温度。本文利用2010年8月1日SDO卫星AIA仪器在171、193和211 $A^{0}$波长上拍摄的太阳活动区11092的EUV图像。我们在11092的子区域中选择一个环，并通过不同波长的强度分布和不同滤波器的热响应函数来提取其温度。在该子区域中，发生环的冷却，并且在所选择的环中，171 $A^{0}$至193 $A^{0}$的波长的最高相对强度被获得为$0.76$，并且该数字被估计为对应于130万开氏度的温度，这是该环的内部区域的最高温度点。在211 $A^{0}$到193 $A^{0}$和211 $A^{0}$到171 $A^{0}$的波长处强度比的最高值是$0.22$和$0.25$，它们依次对应于10 M和1.4 M开尔文附近的温度值，分别与环的较热和较浅点的温度有关。这些值对时间非常敏感，并且在环强度变化的该事件的时间序列中不同。

英文摘要：

Extracting the temperature of coronal loops is effective in the analysis of solar active region's loops and helps in better understanding of coronal events. To this end, various methods have already been developed like the method developed by Aschwanden et al. 2015 \cite{AschwandenB2015} which is based on Gaussian fit for Differential Emission Measure (DEM). Here, we use the intensity ratios of the images in three different wavelengths and the temperature response functions of AIA to extract the temperature of the loop. In this paper, we use EUV images of the solar active region 11092 taken by AIA instrument of the SDO satellite at 171, 193, and 211 $A^{0}$ wavelengths, at 1th of August, 2010. We select a loop in a subregion of 11092 and extract its temperature by the help of intensity profiles in different wavelengths and thermal response functions of different filters. In this subregion cooling of the loop happens and in the selected loop, highest relative intensity of the wavelengths of 171 $A^{0}$ to 193 $A^{0}$ was obtained to be $0.76$ and this number was estimated to correspond to the temperature of 1.3 million degree of Kelvin, which is the maximum temperature point of this loop's internal area. The highest values of the intensity ratios at the wavelengths of 211$A^{0}$ to 193$A^{0}$, and 211$A^{0}$ to 171$A^{0}$ are $0.22$ and $0.25$, which correspond to temperature values around 10M and 1.4M Kelvin in sequence, related to the temperature of hotter and more superficial points of the loop respectively. These values are very sensitive to time and differ in time series of this event of the loop intensity variation.

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