Modeling of EIS Spectrum Drift from Instrumental Temperatures
Modeling of EIS Spectrum Drift from Instrumental Temperatures
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DOI：
10.1007/s11207-010-9603-7
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发表时间：
2010-09-01
期刊：
影响因子：
2.8
通讯作者：
Hansteen, V. H.
中科院分区：
文献类型：
--
作者：
Kamio, S.;Hara, H.;Hansteen, V. H.
已经开发了一个经验模型，利用仪器温度和航天器的相对运动来重现 Hinode 上 EIS 记录的光谱漂移。 EIS 光谱显示，波长尺寸与航天器旋转同步存在人为漂移，这是由光谱仪内部的温度变化引起的。多普勒速度的漂移达到 70 km s(-1)，给速度测量带来了困难。结合人工神经网络来建立仪器温度和光谱漂移之间的关系。该经验模型再现了观测到的频谱偏移，均方根误差为 4.4 km s(-1)。该程序非常可靠，适用于通过 EIS 获得的任何光谱，无论观察场如何。此外，还确定了南北方向的光谱曲率和空间偏移，以补偿仪器效应。
An empirical model has been developed to reproduce the drift of the spectrum recorded by the EIS on Hinode using instrumental temperatures and relative motion of the spacecraft. The EIS spectrum shows an artificial drift in wavelength dimension in sync with the revolution of the spacecraft, which is caused by temperature variations inside the spectrometer. The drift amounts to 70 km s(-1) in Doppler velocity and introduces difficulties in velocity measurements. An artificial neural network is incorporated to establish a relationship between the instrumental temperatures and the spectral drift. This empirical model reproduces observed spectrum shift with an rms error of 4.4 km s(-1). This procedure is robust and applicable to any spectrum obtained with EIS, regardless of the observing field. In addition, spectral curvatures and spatial offset in the north - south direction are determined to compensate for instrumental effects.