DORIS differential slant total electron content (dSTEC)

DORIS dSTEC product provides differential slant total electron content (dSTEC) observations derived from dual-frequency DORIS measurements collected by low Earth orbit (LEO) satellites. The product is generated and maintained by the Chinese Academy of Sciences (CAS) and is intended for global ionospheric research and related scientific applications. The DORIS-dSTEC observable represents the change in slant TEC along a continuous DORIS observation arc, referenced to a selected epoch within the arc. By differencing, instrumental biases and slowly varying errors are largely eliminated, making the product well suited for ionospheric variability studies