Solar EUV spectroscopic observations with SOHO/CDS I. An in-flight calibration study
Solar EUV spectroscopic observations with SOHO/CDS I. An in-flight calibration study
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使用 SOHO/CDS I 进行太阳能 EUV 光谱观测。飞行中校准研究
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
M. Landini
中科院分区：
文献类型：
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作者：
G. Zanna;B. Bromage;E. Landi;M. Landini
本文介绍了SOHO（太阳和日光层天文台）上的日冕诊断光谱仪（CDS）的空中定标研究。CDS的相对强度定标是从观测资料中导出太阳过渡区和日冕重要物理参数的基本要求。这项全面的研究提供了第一个完整的飞行中相对校准的所有九个CDS通道，第一和第二阶。这是通过使用光谱校准方法实现的，主要基于观察到的线比与CHIANTI原子数据库提供的理论预测之间的比较。校准方法已被应用于大量的观测（盘上，o-肢体，安静的太阳，活动区），使从低温到高温的形成的光谱线的使用范围很广。将结果与发射前校准和其他发射后研究进行比较。与地面校准结果的显着diehrance被发现，而有很好的协议与发射后的研究，基于火箭飞行。实验结果表明，该仪器的相对刻度在较长的时间内没有发生明显的变化，从而证实了该仪器的良好稳定性。
An in-flight calibration study of the Coronal Diagnostic Spectrometer (CDS) instrument on board SOHO (Solar and Heliospheric Observatory) is presented. The relative intensity calibration of CDS is a funda- mental requirement for deriving important physical parameters of the solar transition region and corona from the observations. This comprehensive study provides the rst complete in-flight relative calibration of all nine CDS channels, rst and second order. This has been achieved with the use of a spectroscopic calibration method, mainly based on the comparison between observed line ratios and theoretical predictions provided by the CHIANTI atomic database. The calibration method has been applied to a large number of observations (on-disc, o-limb, quiet sun, active region), to enable the use of a wide range of spectral lines from low to high temperatures of formation. The results are compared to the pre-launch calibration and other post-launch studies. Signicant dierences with the ground calibration results are found, while there is good agreement with the post-launch studies, based on rocket flights. It is also shown that the relative calibration has not signicantly changed over a long period of time, thus conrming the excellent stability of the CDS instrument.