Influences of radiation from terrestrial power sources on the ionosphere above China based on satellite observation

2018 2nd International Workshop on Renewable Energy and Development

能源学;经济学

Zhang, Chong^1 ; Ma, Qishuang^1

School of Automation Science and Electrical Engineering, Beihang University, Beijing

100191, China^1

关键词: Central frequency;    DEMETER satellites;    Fundamental frequencies;    Line structures;    Near-earth spaces;    Power system frequencies;    Satellite observations;    Time frequency;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/153/4/042002/pdf
DOI  :  10.1088/1755-1315/153/4/042002

来源: IOP

【 摘 要 】

The environmental effect on the ionosphere caused by man-made power line emission (PLE) and power line harmonic radiation (PLHR) has become an increasing concern. Based on the observed data of 6.5 operating years of DEMETER satellite, by scanning the electric field power density time-frequency spectrograms, 133 PLHR events with central frequencies from 500 Hz to 4.5 kHz are detected in the near-Earth space above China. The fundamental frequency related well to the frequency of corresponding ground power system. Among the 133 events, 129 events have PLE events at the base power system frequency (50 Hz in China). The duration time of every PLE event covers that of the corresponding PLHR event totally. As the same with PLHR, PLE is also propagating in whistler mode in the ionosphere. In two events that are detected in the conjugate region of Australian NWC VLF transmitter, radiations with line structure in the vicinity of 19.8 kHz are detected, suggesting a possible interaction between the NWC signal and radiation from China's power system.