An agile very low frequency radio spectrum explorer  

作　　者：Lin-Jie Chen Yi-Hua Yan Qiu-Xiang Fan Li-Hong Geng Susanta Kumar Bisoi 

机构地区：[1]Key Laboratory of Solar Activity,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [2]School of Astronomy and Space Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]Institute of Automation,Chinese Academy of Sciences,Beijing 100190,China [4]National Institute of Technology,Rourkela 769008,India

出　　处：《Research in Astronomy and Astrophysics》2021年第4期139-148,共10页天文和天体物理学研究（英文版）

基　　金：funded by the National Natural Science Foundation of China(NSFC,Nos.11573043,11790305,11433006);National Key R&D 278 Program of China(2018YFA0404602);the CE4 mission of the Chinese Lunar Exploration Program:the Netherlands-China Low Frequency Explorer(NCLE);Chinese Academy of Sciences(CAS)Strategic Priority Research Program(XDA15020200)。

摘　　要：The very low frequency(VLF)regime below 30 MHz in the electromagnetic spectrum has presently been drawing global attention in radio astronomical research due to its potentially significant science outcomes exploring many unknown extragalactic sources,transients,and so on.However,the nontransparency of the Earth’s ionosphere,ionospheric distortion and artificial radio frequency interference(RFI)have made it difficult to detect the VLF celestial radio emission with ground-based instruments.A straightforward solution to overcome these problems is a space-based VLF radio telescope,just like the VLF radio instruments onboard the Chang’E-4 spacecraft.But building such a space telescope would be inevitably costly and technically challenging.The alternative approach would be then a ground-based VLF radio telescope.Particularly,in the period of post 2020 when the solar and terrestrial ionospheric activities are expected to be in a’calm’state,it will provide us a good chance to perform VLF ground-based radio observations.Anticipating such an opportunity,we built an agile VLF radio spectrum explorer co-located with the currently operational Mingantu Spectra Radio Heliograph(MUSER).The instrument includes four antennas operating in the VLF frequency range 1-70 MHz.Along with them,we employ an eight-channel analog and digital receivers to amplify,digitize and process the radio signals received by the antennas.We present in the paper this VLF radio spectrum explorer and the instrument will be useful for celestial studies of VLF radio emissions.

关 键 词：very low frequency instrumentation:polarimeters methods:data analysis 

分 类 号：P16[天文地球—天文学]