共查询到18条相似文献,搜索用时 62 毫秒
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本文简要地介绍了云南天文台太阳射电快速记录系统PIN调制器的运用,描述了该器件的原理和性能检测,并给出了测试结果。 相似文献
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本文指出了太阳射电快速记录系统中方波隔离放大器研制的必要性,并简要介绍了设计出发点,工作原理,设计和主主要技术指标的测试。 相似文献
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本文指出了太阳射电快速记录系统中方波隔离放大器研制的必要性,并简要介绍了设计出发点,工作原理,设计特点及主要技术指标的测试 相似文献
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本文介绍了云南天文台微带功率晶体管放大器在太阳射电快速记录系统中的设计原理和技术性能,并给出了放大器的线路图和最初的测量结果。 相似文献
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本文介绍了云南天文台微带功率晶体管放大器在太阳射电快速记录系统中的设计原理和技术性能,并给出了放大器的线路图和最初的测量结果。 相似文献
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以新月时月亮的射电辐射为温度基准和准口面温度定标的方法,在22GHz频率上于1993年7月 ̄8月测量了13.7m射电望远镜抛物面天线的增益,根据测量的增益值(67.10±0.07db)定标了太阳射电流量。流量测量的系统差为±5.8%,偶然差为±2.7%,测量的宁静太阳亮温度(非源区)为10100±300K。除此之外,还推导和计算了不同源模型下的天线方向图改正因子Ks,并计算了太阳射电源的流量密度。 相似文献
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1990年7月30日观测到一个射电大爆发,其中在2840MHz射电爆发的峰值附近,发现了周期约为30ms的快速脉动现象,脉动是窄带的,调制度约为50%。 相似文献
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一个太阳微波射电爆发中的快速脉动现象 总被引:1,自引:0,他引:1
1990年7月30日观测到一个射电大爆发,其中在2840MHz射电爆发的峰值附近,发现了周期约为30ms的快速脉动现象,脉动是窄带的,调制度约为50%。 相似文献
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本文分析了云南天文台四波段快速采样射电望远镜在1990年1月至1991年3月间记录到的毫秒级尖峰辐射事件。结合此期间S.G.D.公布的米波射电大爆发资料,给出了毫秒级尖峰辐射的各种特征,总结出毫秒级尖峰辐射同Ⅲ型、Ⅱ型和Ⅳ型太阳射电爆发的关系,最后做出了相应的解释和讨论。 相似文献
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G. N. Zubkova N. N. Kardapolova B. I. Lubyshev V. P. Nefedyev G. Ya. Smolkov R. A. Sych T. A. Treskov 《Astronomische Nachrichten》1990,311(5):313-315
This paper gives the main characteristics of the Siberian Solar Radio Telescope as well as some results derived by investigating the s-component sources and radio bursts on the Sun using the SSRT. 相似文献
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Tan Bao-lin Cheng Jun Tan Cheng-ming Kou Hong-xiang 《Chinese Astronomy and Astrophysics》2019,43(1):59-74
Radio observation is one of important methods in solar physics and space science. Sometimes, it is almost the sole approach to observe the physical processes such as the acceleration, emission, and propagation of non-thermal energetic particles, etc. So far, more than 100 solar radio telescopes have been built in the world, including solar radiometers, dynamic spectrometers, and radioheliographs. Some of them have been closed after the fulfillment of their primary scientific objectives, or for their malfunctions, and thus replaced by other advanced instruments. At the same time, based on some new technologies and scientific ideas, various kinds of new and much more complicated solar radio telescopes are being constructed by solar radio astronomers and space scientists, such as the American E-OVSA and the solar radio observing system under the framework of Chinese Meridian Project II, etc. When we plan to develop a new solar radio telescope, it is crucial to design the most suitable technical parameters, e.g., the observing frequency range and bandwidth, temporal resolution, frequency resolution, spatial resolution, polarization degree, and dynamic range. Then, how do we select a rational set of these parameters? The long-term observation and study revealed that a large strong solar radio burst is frequently composed of a series of small bursts with different time scales. Among them, the radio spike burst is the smallest one with the shortest lifetime, the narrowest bandwidth, and the smallest source region. Solar radio spikes are considered to be related to a single magnetic energy release process, and can be regarded as an elementary burst in solar flares. It is a basic requirement for the new solar radio telescope to observe and discriminate these solar radio spike bursts, even though the temporal and spatial scales of radio spike bursts actually vary with the observing frequency. This paper presents the scaling laws of the lifetime and bandwidth of solar radio spike bursts with respect to the observing frequency, which provide some constraints for the new solar radio telescopes, and help us to select the rational telescope parameters. Besides, we propose a spectrum-image combination mode as the best observation mode for the next-generation solar radio telescopes with high temporal, spectral, and spatial resolutions, which may have an important significance for revealing the physical essence of the various non-thermal processes in violent solar eruptions. 相似文献