Abstract

This paper employs a statistical approach to investigate the diurnal variability of the magnetospheric convective electric field (MCEF) during recurrent activity, considering the phases of solar cycle 24. This study reveals that the magnetosphere exhibits greater dynamism during the maximum and descending phases on recurrent days. The diurnal variability of the MCEF on days of recurrent geomagnetic activity indicates the following trends: (a) An increasing trend followed by a decreasing trend at the phase minimum of the solar cycle; (b) A decreasing trend followed by an increasing trend during the ascending phase and the phase maximum, and (c) five trends during the descending phase. From the minimum phase of the solar cycle to the falling phase, the daily mean values of the MCEF are 0.07428018, 0.10682778, 0.14172194, and 0.11505584 mV/m, respectively. Night-time magnetic reconnections with a southern interplanetary magnetic field (IMF) occur at the phase maximum of the solar cycle and during all-phase periods. Daytime magnetic reconnections occur during the ascending phase at 0700 UT and during the descending phase at 1000 UT.

Key words: Magnetospheric convection electric field, recurrent activity, phases of the solar cycle, magnetic reconnections, interplanetary magnetic field.