TITLE:
Energetic Dynamics of the Inner Magnetosphere in Contact with Fast Solar Wind Currents: Case of the Period 1964-2009
AUTHORS:
Inza Gnanou, Aristide Marie Frédéric Gyébré, Karim Guibula, Christian Zoundi, Frédéric Ouattara
KEYWORDS:
Magnetosphere, Magnetospheric Electric Field, Magnetic Field, Solar Wind, Solar Cycles
JOURNAL NAME:
International Journal of Geosciences,
Vol.13 No.5,
May
23,
2022
ABSTRACT: The Earth’s magnetosphere is a magnetic shield that
protects Earth from high-energy particles and is subject to a series of
internal processes caused by jets of the solar wind (SW) that destabilize it.
These disturbances affect health as well as technology and become more extreme
when SW is more accelerated.
Thus, to better understand the impact of high-speed solar wind (HSSW)
invasion on the dynamics of the magnetospheric system, a statistical study of
HSSW populations was conducted for even (20 and 22) and odd (21 and 23) solar
cycles. The regression analysis using the solar-derived fields from all solar
cycles, indicates three states of the inner magnetosphere: 1) the 00:00UT-15:00UT period marked by a magnetic reconnection on
the day side of the Earth closest to the Sun with the interplanetary magnetic
field (IMF) facing South; 2) the 15:00UT-21:00UT period where IMF changes
from South to North and remains there until 21:00UT; and 3) the 21:00UT-24:00UT period where there is a
reconnection on the night side with stretched field lines. Observations made at
different phases of solar activity lead us to suggest that the magnetospheric electric field (EM) and the Bz component of
IMF (IMF-Bz) are strongly correlated not only at a particular time
scale, but at different time scales. We believe that the daily fluctuations of
the electrical and magnetic effects of magnetospheric origin currents play a
very important role in the dayside magnetic reconnection rate. Moreover,
examination of the cycles with different parities shows important amplitudes of
the solar causes for the even cycles compared to the odd solar cycles.
Therefore, even solar cycles have a strong influence on our socio-economic
system compared to odd cycles.