Oppositely to a previous statistical work using a single time resolution of the total ion density measured onboard the DEMETER satellite, this work deals with statistical seismo-ionospheric influences by comparing different parameters and various time resolutions. The O+ density and electron density recorded by the CSES satellite for more than one year and by the DEMETER satellite for about 6.5 years have been utilized to globally search ionospheric perturbations with different time resolutions. A comparison is automatically done by software between the occurrence of these ionospheric perturbations determined by different data sets, and the occurrence of earthquakes under the conditions that these perturbations occur at less than 1500 km and up to 15 days before the earthquakes. Combined with statistical results given by both satellites, it is shown that the detection rate r of earthquakes increases as the data time resolution and the earthquake magnitude increase and as the focal depth decreases. On average, the number of perturbations is higher the day of the earthquake, and then smoothly decreases the days before, which is independent of either ionospheric parameters or time resolutions. The number of right alarms is high near the South Atlantic Magnetic Anomaly area but its relationship with seismic activities is weak. The ion density tends to be more sensitive to seismic activities than the electron density but this needs further investigations. This study shows that the CSES satellite could effectively register ionospheric perturbations due to strong EQs as the DEMETER satellite does.

On Aug 25, 2018, a G3-class geomagnetic storm, driven by a slow coronal mass ejection from the Sun, impacted the Earth’s magnetosphere causing a transient rearrangement of the charged-particle environment around the planet, which was clearly detected by the entire suite of detectors on board the CSES-01 satellite. In this work, a systematic characterization of the magnetospheric response to the disturbance is reported on the base of complementary electron-flux measurements from the high-energy particle detectors (HEPP-L/H, and HEPD) embarked on CSES-01. CSES-01 results are compared to homologous data from active ground-based and in-orbit instrumentation, and assessed to fit established scenarios in mainstream space-weather scientific literature.

During an experiment involving the alternating O / X mode pump, the observation demonstrated that the high frequency enhanced ion line (HFIL) and plasma line (HFPL) did not immediately appear after the pump onset, but were delayed by a few seconds. By examining the initial behaviors of the ion line, plasma line and electron temperature, it is found that (1) the HFIL and HFPL are delayed not only in the X pump mode but also in the O pump mode; (2) the HFIL can not be observed until the electron temperature is enhanced. The analysis reveals that (1) the leakage of the X mode to the O mode pump can not be ignored; (2) the electron temperature and the spatiotemporal uncertainty may play an important role in the lack of the Bragg condition; (3) nevertheless, the absence of parametric decay instability can not be ruled out due to the spatiotemporal uncertainty.