标题： 雅典大学改进的ARTEMIS IV多通道太阳射电光谱仪 显示英文标题

标题： The improved ARTEMIS IV multichannel solar radio spectrograph of the University of Athens

摘要： 我们介绍了雅典大学在温泉关卫星通信站运行的改进型太阳射电光谱仪。 观测现在覆盖从20到650 MHz的频率范围。 光谱仪有一个7米长的移动抛物面天线，由一个对数周期天线在100至650 MHz范围内馈电，以及一个固定的倒V形宽边偶极子天线，在20至100 MHz范围内使用。 有两个接收器同时工作，一个为全频段扫频接收器（10个光谱/秒，每个光谱630个通道），另一个为声光接收器，用于270至450 MHz范围（100个光谱/秒，每个光谱128个通道）。 数据采集系统由两台计算机组成（每台计算机配备12位、225千样本/秒的ADC）。 灵敏度分别为20至100 MHz频段约3 SFU和100至650 MHz频段约30 SFU。 日常操作完全自动化：接收全球定位系统的时间，将天线指向太阳，系统校准，在预设时间开始和停止观测，数据采集，并刻录到DVD上存档。 我们还可以通过调制解调器或互联网控制整个系统。 该仪器可以单独使用，也可以与其他仪器配合使用，以研究太阳射电爆发及其相关行星际现象的发生和发展。 显示英文摘要

摘要： We present the improved solar radio spectrograph of the University of Athens operating at the Thermopylae Satellite Telecommunication Station. Observations now cover the frequency range from 20 to 650 MHz. The spectrograph has a 7-meter moving parabola fed by a log-periodic antenna for 100 650 MHz and a stationary inverted V fat dipole antenna for the 20 100 MHz range. Two receivers are operating in parallel, one swept frequency for the whole range (10 spectrums/sec, 630 channels/spectrum) and one acousto-optical receiver for the range 270 to 450 MHz (100 spectrums/sec, 128 channels/spectrum). The data acquisition system consists of two PCs (equipped with 12 bit, 225 ksamples/sec ADC, one for each receiver). Sensitivity is about 3 SFU and 30 SFU in the 20 100 MHz and 100 650 MHz range respectively. The daily operation is fully automated: receiving universal time from a GPS, pointing the antenna to the sun, system calibration, starting and stopping the observations at preset times, data acquisition, and archiving on DVD. We can also control the whole system through modem or Internet. The instrument can be used either by itself or in conjunction with other instruments to study the onset and evolution of solar radio bursts and associated interplanetary phenomena.