Ionospheric data during the May 2024 super geomagnetic storm

The Global Navigation Satellite System (GNSS) data, low latitude long range ionospheric radar (LARID) echo, and ionosonde data from the Ionospheric observational network for irregularity and scintillation in East/Southeast Asia (IONISE), the Chinese Meridian Project (http://data.meridianproject.ac.cn), and are archived at the Geophysics Center, National Earth System Science Data Center at BNOSE, IGGCAS (http://wdc.geophys.ac.cn/). The GNSS total electron content (TEC) with sampling rate of 30s are binned into 1°×1° grids every 5 minutes to investigate the ionospheric variation during the storm. The Rate of TEC index (ROTI) are binned into 1°×1° grids every 5 minutes to investigate the ionospheric irregularities during the storm. The LARID at Dongfang are used to investigate the ionospheric variation in a wide zonal span ~3800 km or more. The LARID worked at 20.4 MHz under a beam steering mode, stepped by 5°. For each beam, the radar can receive signals from the slant ranges of 60 km to 9600 km. The ionosonde ionograms obtained at Meiji, Ledong, Wuhan and Beijing with temporal resolutions of 5, 7.5, 15 and 15 min, respectively were manually scaled to get the bottomside plasma frequency profiles.