Abstract: The Very High Frequency (VHF) coherent scatter radar of Meridian Project locates in Fuke, Hainan island of China (109.1°E, 19.5°N), and belongs to National Space Science Center, Chinese Academy of Sciences. The radar beams are set to be perpendicular to the magnetic field lines in ionospheric E- and F-layers in order to obtain the backscattered echoes from ionospheric field-aligned irregularities. The VHF coherent scatter radar continuously detected the plasma irregularities in E- and F-region from 2014 to 2019, and the real-time echo intensity calculated from I/Q signals is uploaded to Meridian Project Data Center. Through this dataset, the dependences of ionospheric irregularities occurrence on solar activity, seasons and local time in low-latitude region (Hainan) can be derived, as well as the day-to-day variations and response characteristics during geomagnetic storms of irregularities. The dataset will provide support for related research and projects on space environment, as well as space weather forecast.
Keywords: coherent scatter radar; low-latitude ionosphere; field-aligned irregularities; quasi-period echoes; spread F; data sharing