Magnetosphere convection electric field (MCEF) time variation from 1964 to 2009: Investigation on the signatures of the geoeffectiveness coronal mass ejections

Abstract

The signatures of the geoeffectiveness solar disturbed events on the Magnetosphere Convection Electric Field (MCEF) universal time variation from 1964 to 2009 are investigated. Here, attention is focused our on the periods concerned by the whole shock activity and by the different types of the geoeffectiveness Coronal Mass Ejections (CMEs) which are one-day-shock, two-days-shock and threedays-shock. The investigation is made with respect to the orientation of the Interplanetary Magnetic Field (IMF). The MCEF time profiles show three different trends except for one-day-shock activity and for three-days-shock activity where we have four trends and one trend, respectively. The MCEF time profiles of the whole disturbed activity, the all shock activity and the one-day-shock activity present the initial phase where the Interplanetary Magnetic Field (IMF) is southward. During the two-days-shock activity, the initial phase of the MCEF shows a non-sensitive trend to the change of the direction of the IMF z-component while for the three-days-shock activity, the MCEF always exhibits the signature of the northward IMF. The last trend of the MCEF time profile shows the southward IMF signature except for the one-day-shock and the three-days-shock activities where that of the northward IMF was seen.

Variability of the electric field of magnetospheric convection in recurrent activity during the solar cycle 24

“…Paulo et al (2019) have noted that a north-south orientation of the IMF favors magnetic reconnection, leading to an intensification of the magnetospheric electric field. Similar results have been reported by several authors (Siqueira et al, 2011;Kaboré and Ouattara, 2018;Inza et al, 2022).…”

“…This dissipation of energy and matter leads to a decrease in the MCEF, reflecting a reduction in magnetospheric convection. It is important to note that this interpretation corroborates those of Kaboré et al (2019) and Kelley (2012), for whom magnetospheric convection weakens when the MFI tilts from south to north.…”

“…However, on days of recurrent activity, the hourly mean MCEF value ranged from a minimum of 0.095534848 mV/m to a maximum of 0.118527778 mV/m. A comparison with earlier study by Kaboré and Ouattara (2018) shows that the hourly mean values of the MCEF on days of recurrent activity are lower than those for shock activity. This would be explained by lower values of the frozen electric field in the solar wind during periods of recurrent activity and shows that the intensity of the magnetospheric disturbance is dependent on the solar source responsible for the geomagnetic activity.…”

“…From 1800 to 2400 UT, there are slight variations in MCEF values: during periods of recurrent geomagnetic activity, at the phase minimum of the solar cycle between 1800 and 2400 UT, the magnetosphere appears to be in a stable state of convection, albeit with sporadic increases. Previous studies such as those by Kabore and Ouattara (2018) have shown that during the solar minimum in periods of shock activity, the MCEF was characterised by an increase after 1200 UT. The opposite was observed during days of recurrent activity.…”

“…According to Kaboré and Ouattara (2018), on days of shock activity caused by geoeffective ICMEs, the hourly mean value of the MCEF varies between a minimum value of 0.137 mV/m and a maximum value of 0.217 mV/m. However, on days of recurrent activity, the hourly mean MCEF value ranged from a minimum of 0.095534848 mV/m to a maximum of 0.118527778 mV/m.…”