A new electric field mill array with each of the mill’s rotor controlled precisely by a GPS module:Equipment and initial results  

作　　者：Kozo Yamashita Hironobu Fujisaka DaoHong Wang Hiroyuki Iwasaki Kazuo Yamamoto Koichiro Michimoto Masashi Hayakawa 

机构地区：[1]Department of Production Systems Engineering and Sciences,Komatsu University,Nu 1-3 Shicho-machi,Komatsu,Ishikawa 923-8511,Japan [2]Fujisaka Technology Office,1058-5 Yoshizawa-cho,Ohta-shi,Gunma 373-0019,Japan [3]Department of Electrical,Electronic and Computer Engineering,Gifu University,1-1 Yanagido,Gifu City,Gifu 501-1193,Japan [4]Cooperative Faculty of Education,Gunma University,4-2-Aramaki-machi,Maebashi,Gunma 371-8510,Japan [5]Department of Electrical and Electronic Engineering,Chubu University,1200 Matsumoto-cho,Kasugai,Aichi 487-8501,Japan [6]Independent Researcher,Kosenba Town 2-44-11-406,Kawagoe City,Saitama,350-0036,Japan [7]Advanced Wireless&Communications Research Center,The University of Electro-Communications,1-5-1 Chofugaoka,Chofu,Tokyo 182-8585,Japan

出　　处：《Earth and Planetary Physics》2024年第2期423-435,共13页地球与行星物理（英文版）

基　　金：This research is based on results obtained from Project JPNP07015;the New Energy and Industrial Technology Development Organization(NEDO)and is also partly supported by the Japan Society for the Promotion of Science KAKENHI Program(Grant No.21K18795)。

摘　　要：We have newly designed an electrostatic sensor,called an electric field mill(EFM),to simplify the estimation of the charge position and charge amount transferred by lightning discharges.It is necessary for this remote estimation of the transferred charge to measure electric field changes caused by charge loss at the time of a lightning strike at multiple locations.For multiple-station measurement of electric field changes,not only speed but also phase for exposure and shielding of the sensing plates inside each EFM of the array should be synchronized to maintain the sensitivities of the deployed instruments.Currently,there is no such EFM with specified speed and phase control performance of the rotary part.Thus,we developed a new EFM in which the rotary mechanism was controlled consistently to within 3%error by a GPS module.Five EFMs had been distributed in the Hokuriku area of Japan during the winter season of 2022-2023 for a test observation.Here we describe the design and a simple calibration method for our new EFM array.Data analysis method based on the assumption of a simple monopole charge structure is also summarized.For validation,locations of assumed point charges were compared with three-dimensional lightning mapping data estimated by radio observations in the MF-HF bands.Initial results indicated the validity to estimate transferred charge amounts and positions of winter cloud-to-ground lightning discharges with our new EFM array.

关 键 词：LIGHTNING electrostatic field electric field mill electric field change 

分 类 号：P427.3[天文地球—大气科学及气象学]