EUNIS-06 170-205 A通道的绝对辐射校准和CDS/NIS的校准更新
Absolute radiometric calibration of the EUNIS-06 170-205 A channel and calibration update for CDS/NIS
摘要：
极紫外正入射光谱仪探测火箭有效载荷于2006年4月12日（EUNIS-06）飞行，携带两台独立的成像光谱仪，分别覆盖300-370 A的一阶和170-205 A的二阶波段。EUNIS-06长波（LW）通道的绝对辐射响应是在SOHO发射前用于校准CDS的同一设施中直接测量的。由于短波长（SW）通道的绝对校准不能从相同的实验室配置中获得，我们在这里提出了一种技术，以获得它使用太阳LW光谱和密度和温度不敏感的线强度比的组合。在这个过程中的第一步是使用协调的，共空间EUNIS和SOHO/CDS光谱进行CDS NIS-1波段的强度校准更新，这表明其效率降低了约1.7倍，相比以前实施的校准。然后，从CHIANTI获得的理论不敏感线比允许我们确定EUNIS SW带通内的发射线的绝对强度，从EUNIS LW校准校正后的共空间CDS/NIS-1光谱。从来自Fe Fe X-Fe XIII的5个CDS和12个SW发射线的强度得到的总共12个比率产生了EUNIS-06 SW通道的仪器响应曲线，其与依赖于组合单个光学组件的测量的相对校准很好地匹配。考虑到所有潜在的误差来源，我们估计EUNIS-06 SW绝对校准精度约为20%。
英文摘要：
The Extreme-Ultraviolet Normal-Incidence Spectrograph sounding-rocket payload was flown on 2006 April 12 (EUNIS-06), carrying two independent imaging spectrographs covering wave bands of 300-370 A in first order and 170-205 A in second order, respectively. The absolute radiometric response of the EUNIS-06 long-wavelength (LW) channel was directly measured in the same facility used to calibrate CDS prior to the SOHO launch. Because the absolute calibration of the short-wavelength (SW) channel could not be obtained from the same lab configuration, we here present a technique to derive it using a combination of solar LW spectra and density- and temperature-insensitive line intensity ratios. The first step in this procedure is to use the coordinated, cospatial EUNIS and SOHO/CDS spectra to carry out an intensity calibration update for the CDS NIS-1 waveband, which shows that its efficiency has decreased by a factor about 1.7 compared to that of the previously implemented calibration. Then, theoretical insensitive line ratios obtained from CHIANTI allow us to determine absolute intensities of emission lines within the EUNIS SW bandpass from those of cospatial CDS/NIS-1 spectra after the EUNIS LW calibration correction. A total of 12 ratios derived from intensities of 5 CDS and 12 SW emission lines from Fe Fe X - Fe XIII yield an instrumental response curve for the EUNIS-06 SW channel that matches well to a relative calibration which relied on combining measurements of individual optical components. Taking into account all potential sources of error, we estimate that the EUNIS-06 SW absolute calibration is accurate to about 20%.
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