摘要
本文详细介绍了1983年日食光谱资料的强度和高度定标方法和结果,并讨论了其精度.对同一波段,用两种不同的绝对定标方法得出的结果基本一致,说明定标是可靠的.文中还给出了二切无缝谱色球底的位置,并计算了该区的温度.
In this paper, the photometric and height calibration procedures of the spectra obtained at the 1983 total solar eclipse are given in detail. The accuracy of the results is discussed. For the absolute calibration of the characteristic curves, two methods are introduced. In both cases, the Sun serves as a standard source. In the first case, the atmosphere extinction curve is derived from the slit spectra of the disk center at different zenith distances before and after the eclipse, thereby the absolute calibration being immediately carried out from the intrinsic intensity of the Sun and the slit width, etc. On the other hand, the slitless spectra around the second contact are used to plot the Eλ (h) - h curve, and the base of the chromosphere is determined as the height corresponding to the inflection point of the E5000 A (h) - h curve.Comparing the d/dhEλ(h) -Adata with the limb-darking curves, we can easily calibrate thecharacteristic curves in a way different from the first one. There is indication that the results of both methods are quite consistent, implying feasibility of our calibration procedures.Finally, the temperature at the base of the chromosphere is calculated to be 4385 ±50K, in accordance with the data of the slitless spectra.
关键词
太阳
日食
光度
定标
Sun-eclipse-photometric calibration
