Solar Quiet Current Response in the African Sector due to a 2009 Sudden Stratospheric Warming Event
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Date
2016
Authors
Bolaji, O.S
Oyeyemi, E.O
Owolabi, O.P
Yamazaki, Y
Rabiu, A.B
Okoh, D
Fujimoto, A
Amory-Mazaudier, C
Seemala, G.K
Yoshikawa, A
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Abstract
We present solar quiet (Sq)variation of the horizontal (H) magnetic field intensity deduced from
Magnetic Data Acquisition System (MAGDAS) records over Africa during an unusual strong and prolonged
2009 sudden stratospheric warming (SSW)event. A reduction in the SqH magnitude that enveloped the
geomagnetic latitudes between 21.13°N (Fayum FYM) in Egypt and 39.51"S(Durban DRB)in South Africa was
observed, while the stratospheric polar temperature was increasing and got strengthened when the
stratospheric temperature reached its maximum. Another novel feature associated with the hemispheric
reduction is the reversal in the north-south asymmetry of the SqH, which is indicative of higher SqH
magnitude in the Northern Hemisphere compared to the Southern Hemisphere during SSWpeak phase. The
reversal of the equatorial electrojet (EEJ)or the counter electrojet (CEJ)was observed after the polar
stratospheric temperature reached its maximum. The effect of additional currents associated with CEJwas
observed in the Southern Hemisphere at middle latitude. Similar changes were observed in the EEJat the
South America, Pacific Ocean, and Central Asia sectors. The effect of the SSWis largest in the South American
sector and smallest in the Central Asian sector.
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Staff Publications
Keywords
Central Asian sector , Pacific Ocean , Magnetic Data Acquisition System , Stratospheric Temperature
Citation
Bolaji, O. S.,et al. (2016) Solar quiet current response in the African sector due to a 2009 sudden stratospheric warming event. Journal of Geophys. Res. Space