Diagnosing the storm-time ring current and other magnetospheric plasma domains using relativistic electron data

Ring current ions and relativistic electrons simultaneously measured on board MOLNIYA-1 are analyzed in comparison with the ground-based magnetometer data for the period of a strong magnetic storm (|D_st|max≈230 nT). Injection of >500 keV electrons into the slot region (L≈3) near equatorial plane is occurred on time scale ≈1 hour, when, during the magnetic storm maximum, the extreme low-latitude position of auroral electrojets is reached and ring current becomes more symmetrical. Positions of both the ring current maximum and electron intensity maximum (L_max) are consistent to our previous result: |D_st|_max = 2.75 • 10⁴/L⁴_max. An extreme storm-time low-latitude position of the west electrojet center (for amplitudes of |D_st|_max up to 600 nT) is shown to be in a good consistence with this empirical dependence. It is supposed the trapped radiation boundary collapses down to L≈L_max in the course of the storm main phase.