冷湖地区因干旱少雨、晴天数多、云量覆盖少等特点,引起了天文学家的高度关注。2018年开始在冷湖赛什腾山开展光学视宁度测量,几年测量结果表明赛什腾山光学台址特性可比肩世界著名光学台址。为进一步了解赛什腾天文台址的电磁环境特性...冷湖地区因干旱少雨、晴天数多、云量覆盖少等特点,引起了天文学家的高度关注。2018年开始在冷湖赛什腾山开展光学视宁度测量,几年测量结果表明赛什腾山光学台址特性可比肩世界著名光学台址。为进一步了解赛什腾天文台址的电磁环境特性,开展了无人值守无线电干扰RFI(Radio Frequency Interference)测量设备的研制以及在赛什腾山天文台址的电磁环境监测。文章主要介绍基于研制的0.1~18 GHz频段RFI测量系统,在冷湖赛什腾山天文台址规划D点(海拔4055 m)开展为期超过一年的RFI测量,以及测量结果的评估。展开更多
A broadband solar radio type III burst was observed on August 25,1999 at Purple Mountain Observatory with waveband of 4.5-7.5 GHz.It was also observed at Beijing Astronomical Observatory with waveband of 5.2-7.6 GHz.T...A broadband solar radio type III burst was observed on August 25,1999 at Purple Mountain Observatory with waveband of 4.5-7.5 GHz.It was also observed at Beijing Astronomical Observatory with waveband of 5.2-7.6 GHz.Therefore,it is the first common spectral event observed in China.The type III bursts are gathered into more than 10 groups and drift in opposite directions,but the reverse drifting prevails.The largest bandwidth of type III burst reaches≥3 GHz and may be the broadest bandwidth of the reverse type III burst ever observed up to the present.Some new observing characteristics of fine structures are found,for example,fiber-like,V-shaped and neck-ring-like structures.Especially,the neck-ring-like structure is probably first discovered in cm waveband and may be the evidence of twisted rope of magnetic lines.展开更多
基金Supported by National Natural Science Foundation of China(11925304,12020101002,11903086,11903087,11973095)Foundation of the Chinese Academy of Sciences(QYZDJ-SSW-SLH043,GJJSTD20210002)。
文摘冷湖地区因干旱少雨、晴天数多、云量覆盖少等特点,引起了天文学家的高度关注。2018年开始在冷湖赛什腾山开展光学视宁度测量,几年测量结果表明赛什腾山光学台址特性可比肩世界著名光学台址。为进一步了解赛什腾天文台址的电磁环境特性,开展了无人值守无线电干扰RFI(Radio Frequency Interference)测量设备的研制以及在赛什腾山天文台址的电磁环境监测。文章主要介绍基于研制的0.1~18 GHz频段RFI测量系统,在冷湖赛什腾山天文台址规划D点(海拔4055 m)开展为期超过一年的RFI测量,以及测量结果的评估。
基金Supported by the National Natural Science Foundation of China under Grant Nos 10390163 and 10211120645, the Chinese Academy of Sciences under Grant No K3CX2-SW-T2, and the Russian Foundation for Basic Research under Grant No 04-02-39016.
文摘一个伪光的超导的 NbN 热电子的幅射热测定器(HEB ) 混合器为 THz 协调察觉者的噪音温度的频率依赖的理解在 0.5-2.5 THz 的频率范围被测量。当考虑 high-frequencycurrent 的不一致的分发时，噪音温度与频率增加主要由于在伪光的平面天线和超导的 HEB 桥之间的联合损失，这被发现了。与改正的联合损失，超导的 HEB 混合器表明将近独立于频率的噪音温度。
基金Supported by the National Natural Science Foundation under Grants Nos.19833050 and 49990451by a Major Project of Chinese Academy of Sciences.
文摘A broadband solar radio type III burst was observed on August 25,1999 at Purple Mountain Observatory with waveband of 4.5-7.5 GHz.It was also observed at Beijing Astronomical Observatory with waveband of 5.2-7.6 GHz.Therefore,it is the first common spectral event observed in China.The type III bursts are gathered into more than 10 groups and drift in opposite directions,but the reverse drifting prevails.The largest bandwidth of type III burst reaches≥3 GHz and may be the broadest bandwidth of the reverse type III burst ever observed up to the present.Some new observing characteristics of fine structures are found,for example,fiber-like,V-shaped and neck-ring-like structures.Especially,the neck-ring-like structure is probably first discovered in cm waveband and may be the evidence of twisted rope of magnetic lines.
