Response of Hinode XRT to quiet Sun, active region and flare plasma
Response of Hinode XRT to quiet Sun, active region and flare plasma
复制标题
Hinode XRT 对安静太阳、活跃区域和耀斑等离子体的响应
DOI：
10.1051/0004-6361/201016346
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发表时间：
2014
影响因子：
6.5
通讯作者：
H. Mason
中科院分区：
文献类型：
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作者：
B. O'Dwyer;G. Zanna;H. Mason
目标。我们使用日出极紫外成像光谱仪 (EIS) 进行同步观测，检查日出 X 射线望远镜 (XRT) 对耀斑、活跃区域和安静太阳区域的响应。我们还检查了 EIS 和 XRT 的相对强度校准。方法。 EIS 微分发射测量分布 (DEM) 曲线用于通过 CHIANTI 原子数据库创建合成光谱。根据合成光谱确定谱线和连续发射对每个 XRT 通道的贡献，然后将合成光谱与每个 XRT 通道的有效面积进行卷积。将每个通道的预测总计数率与观察到的计数率进行比较。研究了不同元素丰度和反演温度范围的影响。还计算了从 XRT 波段获得的 DEM，并与通过 EIS 获得的 DEM 进行了比较。结果。对于活性区域观测，大多数通道观测到的 XRT 计数率与使用 EIS 观测预测的计数率相当一致，但取决于所选元素丰度。发现了预测计数率和观测计数率之间的显着差异，并针对邻近的安静太阳区域和耀斑进行了讨论。针对活跃区域、安静太阳和耀斑观测，介绍并讨论了对 XRT 通道有贡献的合成光谱和连续发射。
Aims. We examine the response of the Hinode X-Ray Telescope (XRT), using simultaneous observations with the Hinode Extremeultraviolet Imaging Spectrometer (EIS), for a flare, an active region and a quiet Sun region. We also examine the relative intensity calibration of EIS and XRT. Methods. EIS differential emission measure distribution (DEM) curves were used to create synthetic spectra with the CHIANTI atomic database. The contribution of spectral lines and continuum emission to each of the XRT channels was determined from the synthetic spectra, which were then convolved with the effective area of each XRT channel. The predicted total count rates for each channel were compared with the observed count rates. The effects of varying elemental abundances and the temperature range for the inversion were investigated. DEMs obtained from the XRT bands were also computed and compared to those obtained with EIS. Results. For the active region observations, the observed XRT count rates for most of the channels are in reasonable agreement with those predicted using EIS observations, but are dependent on the elemental abundances chosen. Significant discrepancies between predicted and observed count rates were found and are discussed for the adjacent quiet Sun region and also for the flare. Synthetic spectra and continuum emission contributing to the XRT channels are presented and discussed for the active region, quiet Sun and flare observations.