Response of the magnetospheric convection electric field (MCEF) to geomagnetic storms during the solar cycle 24 declining phase

Authors

  • Nongobsom Bazié
    Laboratoire de Chimie Analytique, de Physique Spatiale et Energétique (L@CAPSE), Université Norbert ZONGO, Koudougou, Burkina Faso.
  • Christian Zoundi
    Laboratoire de Chimie Analytique, de Physique Spatiale et Energétique (L@CAPSE), Unversity Norbert ZONGO
  • M'BI Kaboré
    Laboratoire de Matériaux, d’Héliophysique et Environnement (La.M.H.E), ED/ST, Université Nazi BONI, 01 BP 1091, Bobo- Dioulasso, Burkina Faso
  • Alfred Jean Stéphane Dama
    Laboratoire de Chimie Analytique, de Physique Spatiale et Energétique (L@CAPSE), Université Norbert ZONGO, Koudougou, Burkina Faso.
  • Frédéric Ouattara
    Laboratoire de Chimie Analytique, de Physique Spatiale et Energétique (L@CAPSE), Université Norbert ZONGO, Koudougou, Burkina Faso.

Keywords:

Geomagnetic storm, Geoeffective interplanetary coronal mass ejections, Magnetospheric convection electric field, Solar cycle

Abstract

This article examines the magnetospheric convection electric field (MCEF) fluctuations during seven moderate to severe storms in the declining phase of solar cycle 24. The storms induced by ICMEs were selected based on specific conditions. The primary aim of this study is to assess the influence of geoeffective ICMEs on the MCEF. We conducted a cross-correlation analysis to examine the temporal delays between MCEF fluctuations and geomagnetic indices (Sym-H and AE), as well as the IMF Bz. A linear regression was employed to assess MCEF fluctuations in relation to variations in Sym-H, AE, and Bz. A strong correlation (R = 0.81) was seen between the average transit speed of ICMEs and MCEF fluctuations in the initial phase, underscoring the direct influence of ICMEs on the MCEF. ICMEs with speeds >= 800 km/s cause substantial MCEF variations during the storm's initial phase, with a variation of 0.08 mV/m for every one nT change in IMF Bz. During the complete evolution of the examined storms, fluctuations in the AE index precede those of the MCEF, with time delays between 21 and 44 minutes. MCEF variations exhibit a delay relative to Sym-H index fluctuations, with estimated intervals ranging from 60 to 306 minutes.

Dimensions

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Dungey’s two models of the reconnecting magnetosphere.

Published

2025-08-13

How to Cite

Response of the magnetospheric convection electric field (MCEF) to geomagnetic storms during the solar cycle 24 declining phase. (2025). Journal of the Nigerian Society of Physical Sciences, 7(4), 2696. https://doi.org/10.46481/jnsps.2025.2696

Issue

Volume 7, Issue 4, November 2025

Section

Physics & Astronomy
Copyright & Licensing

Copyright (c) 2025 Nongobsom Bazié, Christian Zoundi, M'BI Kaboré, Alfred Jean Stéphane Dama, Frédéric Ouattara (Author)

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

Response of the magnetospheric convection electric field (MCEF) to geomagnetic storms during the solar cycle 24 declining phase. (2025). Journal of the Nigerian Society of Physical Sciences, 7(4), 2696. https://doi.org/10.46481/jnsps.2025.2696

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