# DSECS toolbox https://earth.esa.int/eogateway/activities/dipolar-spherical-elementary-current-systems-dsecs-toolbox From the matlab tool: ![](https://i.imgur.com/xJgVCzA.png) ## Inputs needed - MAG_LR (A&C) - `B_NEC, Latitude, Longitude, Radius` - with CHAOS model residual - `apexLat`: (rename to `ApexLatitude`?) apex coordinates via apexpy (or are QD coordinates okay? those already available from VirES as QDLat/QDLon) Used for separating the analysis between each hemisphere - `ggFPlat`, `ggFPlon`: (rename to `FootprintLatitude`?) Ionospheric footprints of measurements (trace the magnetic field model from the measurement @~450km to the E-region @~130km): can be obtained from taking the inverse transformation (apex->geo, replacing the altitude) of the apex coordinates of the measurement points. These are used to exclude a region of unreliable results around the equator. - `Uv`: (rename to ?) Unit vector in direction of magnetic field model (i.e. from `B_NEC_Model`)