INVERSION OF THE AURORAL ELECTROJETS FROM MAGNETOMETER CHAIN DATA-BASED ON THE FLEXIBLE TOLERANCE METHOD

An improved method is developed to invert a one-dimensional east-west electrojet from the H component of the geomagnetic disturbances measur ed along a meridian chain of magnetometer stations. This nonlinear inv ersion method is based on the flexible tolerance method. The main diff erence between this new method and the previous methods is that the he ight, the width and the location of the auroral electrojet current are determined together from the data by the flexible tolerance method, r ather than assumed or calculated independently as in the previous meth ods. It should be noted also that the method presented in this paper i s fast enough to allow a real-time display of the inverted electrojet current distribution by a workstation.