A Study of the Relationship Between Southward Bz > -10 nT and Storm Time Disturbance Index During Solar Cycle 23

Autor: T. W. David, Bolarinwa Adekoya, Chizurumoke Michael, Sofiat Adekoya, Omolara Adenuga, Semiu Kareem, Hamid Oladunjoye, Abayomi Ajetunmobi, Oyindamola Williams, Damilola Ogundele
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Journal of Nigerian Society of Physical Sciences, Vol 4, Iss 4 (2022)
Druh dokumentu: article
ISSN: 2714-2817
2714-4704
DOI: 10.46481/jnsps.2022.620
Popis: Magnetic reconnection can be used for studying the geoeffective processes in the coupled Sun–Solar wind – Magnetosphere dynamics leading to geomagnetic disturbance. In this study, 1-hour resolution solar wind plasma parameters from OMNIweb were used to investigate the relationship between moderate southward interplanetary magnetic field, IMF-Bz (i.e., Bz > -10 nT) and geomagnetic storm time disturbance, Dst , during the ascending, maximum and descending phases of solar cycle 23. Occurrences of different classes of geomagnetic storms during moderate southward Bz are reported. The occurrence of weak and moderate geomagnetic storms is more predominant during maximum solar activity than intense and super intense storms. It was found that 10.11 % (181) of all the classes of the storm were intense, and 0.17 % (3) were super intense storms. Furthermore, it was found that 4 (2.2 %) out of the 181 intense storms were caused by southward Bz > -10 nT which were associated with the complex structure due to the high-speed solar wind stream and corotating interacting region. In such a complex structure and Bz > -10 nT, we observed that an intense geomagnetic storm rarely occurs and if it does, would be predominant around solar maximum. It was found that long-duration (\Delta t > 6 hrs) of southward Bz (i.e., -10 nT < Bz -10 nT is rare and possesses a special configuration of magnetic field and solar wind parameters structures which are CIR manifestations.
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