2840MHz太阳射电辐射流量计的升级改造

Upgrading the Solar Radio Flux Telescope with the Frequency of 2.84GHz

叙述了国家天文台升级改造后的2 840 MHz太阳射电辐射流量计的设计特点、性能、结构及观测结果。升级改造后的太阳射电辐射流量计将在较高时间分辨率上实时得到2 840 MHz频率上的太阳流量,为太阳物理研究积累丰富的观测数据,是太阳活动监测和预报的重要参数之一。

The solar radio flux telescope with the frequency of 2. 84GHz is an important instrument to monitor and forecast the solar activities by collecting and analyzing the solarradio fluxes. At the beginning of the 21st century, the regular monitoring by using such an instrument was stopped due to ageing of most components and difficult to repair during the long running. Now we have updated the microwave front-end, the analog receiving system, the digital acquisition system, the storage and display system, and the 2m parabolic antenna to the system. In the new system we adopted a radiometer for k-factor measurement and a new self- calibration technique which makes the calibration more efficient and accurate. At present, the upgraded solar radio flux telescope working at 2. 84GHz has achieved some good results.