[M-IS13] Atmospheric electricity: Application of technology for reducing disaster risks

[MIS13-P03] Relationship between horizontal distribution of negative specific differential phase and lightning discharge distribution

*Hiroshi Kikuchi¹, Eiichi Yoshikawa ², Yoshitaka Nakamura³, Takeshi Morimoto⁴, Tomoo Ushio⁵, Yasuhide Hobara¹ (1.The University of Electro Communications, 2.Japan aerospace exploration agency, 3.Kobe City College of Technology, 4.Kinki University, 5.Osaka University)

Keywords:Weather radar , Lightning discharge

A dual polarized phased array weather radar (MP-PAWR) has been developed in 2018. It can provide dual polarization variables that reveal detailed microphysics of storms. The DP-PAWR simultaneously transmits pulses of horizontal and vertical polarized waves. The center of frequency and observation range are 9.43 GHz and 60 km, respectively. The DP-PAWR provides the dual-polarization radar measurements of precipitation in less than 30 seconds. Additionally, the 113 samples are observed from 0 deg to 90 deg in elevation angles. The spatial resolution for the elevation angles is approximately 0.8 deg. For azimuth angles, the spatial resolution is 1.2 deg.
Our research group had also installed 13 low and medium frequency (LF/MF) band sensor network to locate lightning discharges in the Kanto area in Japan. The system provides the three-dimensional locations of lightning discharges.
In this presentation, polarimetric radar data using DP-PAWR will be compared with 3-D lightning discharge distribution using LF/MF lightning sensors. We discuss the relationship between horizontal distribution of negative specific differential phase and lightning discharge distribution using 30 sec full volume scan data with MP-PAWR and the electric field structure inside thunderclouds with LF sensor network.