ABSTRACT
Demeter satellite data are divided into 4 levels, namely, Level-0, Level-0’, Level-1, Level-2. Level-1 experimental data are standardized format data, mainly for scientific research. Level-1 data are divided into 6 categories, namely, electric field data, the magnetic field data, electron density data, ion density data, ion-temperature-density data, et al. electric field data are divided into 6 frequency bands. We use the electric field data [6] of the Level-1 ULF frequency band whose file identifier is 1129 for analysis.
