The Comparison of Electron Density between CSES In Situ and Ground-Based Observations in China

Abstract

As the observation accuracy of parameters in the ionosphere cannot be directly checked, the comparison with other observations is the main way to evaluate the data quality of satellite measurements. Through the comparative analysis between the in situ electron density (Ne) observed by the China Seismo-Electromagnetic Satellite (CSES) and Ne at about 500 km altitude detected by Qujing Incoherent Scatter Radar (ISR), it was found that the pattern of CSES Ne is consistent with that of ISR Ne, and the correlation coefficient between the two sets of data is above 0.88 for different groups according to the magnitude. The value of CSES Ne is lower than that of ISR Ne, and the median value of the ratio for the difference between the conjugate data is 84.04%. Based on the comparison in the daytime between CSES Ne and ionosonde observations in China, it was found that the trend of the two datasets is mostly similar, and the correlation coefficient in some locations can reach up to 0.7. The distribution of CSES Ne and correlation coefficients at different latitudes show that the relationship is relatively better around the peak of the equatorial ionization anomaly (EIA). The differences in the value between CSES Ne and ionosonde data also exist, the relative change of which is about 80–95% in the daytime.

Modeling the Topside Ionosphere Effective Scale Height through In Situ Electron Density Observations by Low-Earth-Orbit Satellites

“…Several studies compared and validated CSES-01 LP N e observations against observations made by incoherent scatter radars and similar LEO satellites, as well as against corresponding values provided by ionospheric models [30][31][32][33][34]. There is good agreement among these studies in highlighting a general underestimation of N e values recorded by CSES-01 when compared to different data sources.…”

Automatic Identification and Statistical Analysis of Data Steps in Electric Field Measurements from CSES-01 Satellite

“…Marchetti et al [3] integrated CSES measurements (especially Ne) with those of other anomalies from the lithosphere and atmosphere, as well as Swarm satellite measurements, for large earthquakes in the Indonesian region. Liu et al [4] Liu evaluated the data quality of satellite measurements of ionospheric parameters by comparing them with in situ observations and ionosonde data. Yang et al [5] Remote Sens.…”