标题：A solar radio dynamic spectrograph with flexible temporal-spectral resolution
作者：Du Qingfu;Chen Lei;Zhao Yuechang;Li Xin;Zhou Yan;Zhang Junrui;Yan Fabao;Feng Shiwei;Li Chuanyang;Chen Yao
作者机构：[Du Qingfu] School of Mechanical, Electrical & Information Engineering, Shandong University, Weihai, Shandong 264209, China.;[Chen Lei] School of Mech 更多 通讯作者地址：[Du, QF]Shandong Univ, Sch Mech Elect & Informat Engn, Weihai 264209, Peoples R China;[Du, QF]Shandong Univ, Inst Space Sci, Weihai 264209, Peoples R 更多
关键词：Sun: radio radiation; radiation: dynamics; instrumentation:; spectrographs; methods: data analysis; techniques: image processing
摘要：Observation and research on solar radio emission have unique scientific values in solar and space physics and related space weather forecasting applications, since the observed spectral structures may carry important information about energetic electrons and underlying physical mechanisms. In this study, we present the design of a novel dynamic spectrograph that has been installed at the Chashan Solar Radio Observatory operated by the Laboratory for Radio Technologies, Institute of Space Sciences at Shandong University. The spectrograph is characterized by real-time storage of digitized radio intensity data in the time domain and its capability to perform off-line spectral analysis of the radio spectra. The analog signals received via antennas and amplified with a low-noise amplifier are converted into digital data at a speed reaching up to 32 k data points permillisecond. The digital data are then saved into a highspeed electronic disk for further off-line spectral analysis. Using different word lengths (1-32 k) and time cadences (5ms-10 s) for off-line fast Fourier transform analysis, we can obtain the dynamic spectrum of a radio burst with different (user-defined) temporal (5 ms-10 s) and spectral (3 kHz similar to 320 kHz) resolutions. This enables great flexibility and convenience in data analysis of solar radio bursts, especially when some specific fine spectral structures are under study.