Geomagnetic ap index calculation method and system, storage medium and terminal

The invention provides a geomagnetic ap index calculation method and system, a storage medium and a terminal. The geomagnetic ap index calculation method comprises the steps of obtaining a satellite position of a sun-synchronous orbit terminator satellite and a collected observation magnetic field; calculating a model magnetic field of an international reference geomagnetic field model based on the satellite position; calculating a residual magnetic field between the model magnetic field and the observation magnetic field; based on the residual magnetic field of the geomagnetic calm day, constructing a residual magnetic field distribution model which is continuously distributed along the longitude and latitude; performing detrending processing on the observation magnetic field based on the residual magnetic field distribution model; under the GEO coordinate system, calculating a Z-direction average residual magnetic field of a residual magnetic field within 60 degrees of north-south magnetic weft of each orbi