Modeling of EIS Spectrum Drift from Instrumental Temperatures |
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| Authors: | S Kamio H Hara T Watanabe T Fredvik V H Hansteen |
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| Institution: | (1) State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, 130023 Changchun, People’s Republic of China;(2) School of Physics, Northeast Normal University, 130021 Changchun, People’s Republic of China; |
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| Abstract: | 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. |
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