摘要: In our previous studies (ZHANG et al., 2024a, 2024b), using experiments by Sanya (18.3°N, 109.6°E) Incoherent Scatter Radar (SYISR), we have obtained the line-of-sight ion velocity in multiple directions, further calculated three-dimensional vector velocity through least square fitting, subsequently derived electric fields from 200 km to 500 km based on the ion momentum equation. In this study, we further derived nighttime zonal wind from 200 km to 500 km based on the F region dynamo theory. To verify the reliability, we first analyzed the variations and errors of the nighttime zonal wind at different time scales. Then, we used an empirical model (HWM) and a theoretical model (NCAR-TIEGCM) for comparative analysis. They had a relatively good consistency. The maximum nighttime zonal wind velocity for the SYISR (HWM, TIEGCM) is 115.6 m/s (144.3 m/s, 92.1 m/s) for monthly average value. We further compared the nighttime zonal wind with that of a co-located FPI. They showed a positive correlation of ~0.68.