紫金山天文台太阳射电频谱仪定标

Calibration of Solar Radio Spectrometer of the Purple Mountain Observatory

定标是射电天文观测中基础而重要的工作.定标工作可以得到太阳观测中的一个重要物理量:太阳射电辐射流量,可以扣除射电频谱仪的通道不均匀性,清晰显示射电频谱特征.结合紫金山天文台射电频谱仪的观测数据,详细介绍了定标的基本方法,分析了定标常数的变化情况,最后给出了定标结果,并与野边山射电偏振计以及RHESSI(The Reuven Ramaty High Energy Solar Spectroscopic Imager)卫星硬X射线波段的几个太阳耀斑的观测结果进行了比较,结果符合耀斑的光变特征.其中对一个耀斑脉冲相硬X射线流量和微波光变的相关性的分析表明这些观测可以用来研究有关的辐射机制以及相应的能量释放和粒子加速过程.

Calibration is a basic and important procedure in the radio astronomy. It deduces the solar radio flux which is an important physical quantity of solar observation. It also deducts the flat-field of the spectrometer, displaying the radio spectrogram clearly. In this paper, we first introduce the basic method of calibration based on the data of solar radio spectrometer of the Purple Mountain Observatory. We then analyze the variation of the calibration coefficients, and give the calibrated results for a few flares. These results are compared with those from the Nobeyama solar radio polarimeters and hard X-ray band of RHESSI （The Reuven Ramaty High Energy Solar