甘肃金塔地区大气对太阳射电辐射吸收的测量研究

Measurements of Local Atmospheric Absorption on the Solar Radio Emission at Jingta Region of Gansu

2008年8月1日,在我国西北的新疆、内蒙、甘肃等地区可以观测到一次日全食的天象,紫金山天文台太阳射电团组在甘肃省金塔用两架太阳射电望远镜对这次日全食进行了观测,并成功地取得了观测资料.为了科学分析观测资料,在日全食的前两天,实测了当地的大气吸收.着重分析这些观测数据,结合太阳射电方法,测得在λ=2.4 cm和λ=8.6 mm波段上,当地天顶方向的大气吸收因子Γ_0分别为0.012 Nb和0.068 Nb.这完全符合以前大气吸收的测量结果.利用所得到的大气吸收因子,对这两个波段的食变曲线作了相应的修正.其结果显示,原始的食变曲线被大幅度更正,更靠近无吸收的实测结果.但是要对食变曲线作进一步的修正,还需要分析诸如地面辐射、天空背景辐射、月亮辐射、仪器增益漂移等其它因素的影响.

A total solar eclipse was observed successfully by solar radio telescopes at wavelengths of 2.4 em and 8.6 mm in .lingta, Gansu province on 2008 August 1. Before the eclipse, the local atmospheric absorption was measured at these two wavelengths. Consistent with the previous findings, we obtained that the local absorption factors along the zenith direction are 0.012 Nb and 0.068 Nb, respectively. Using these values, the light curves of total sdar eclipse are corrected by the atmospheric absorption at λ=2.4 cm and λ=8.6 mm. However, the results show that these light curves still need to be corrected by other factors, especially the strong absorption from the ground, before the further scientific study.