%0 Journal Article
%T Magnetospheric and Ionospheric Sources of Geomagnetic Field Variations
%A Enoch Oluwaseun Elemo
%A Akeem Babatunde Rabiu
%J Open Access Library Journal
%V 1
%N 9
%P 1-8
%@ 2333-9721
%D 2014
%I Open Access Library
%R 10.4236/oalib.1101035
%X This
study investigated the magnetospheric and ionospheric sources of geomagnetic
field variation using the data set that consists of the hourly values of the
geomagnetic element: horizontal intensity <i>H</i>,
recorded at the geomagnetic observatory of the Department of physics,
university of Ilorin, Ilorin (Long 4.670 and Lat. 8.50, dip 4.1ˇăS)
Nigeria for the months of august, October and December in the year 2008. The
study attributed the daytime variation to the ionospheric sources while various
reasons were given to explain these night-time variations, which include
convective drift currents in the magnetosphere and the asymmetric rings
currents in the magnetospheric currents; this variation due to disturbances indicates possible non-ionospheric origin and a partial
ring current in the night side magnetosphere. The mean monthly hourly variation showed
seasonal variation with the Sq(<i>H</i>)
maximizes in equinox with least variation in June solstice. Moreover, the mean ration of seasonal contributions
of magnetospheric to ionospheric sources revealed that the E season has more
contributions from both magnetospheric and ionospheric sources than other
seasons with the least occurring during the J season.<o:p></o:p>
%K Sq(<i>H</i>)
%K Geomagnetic Observatory
%K Magnetospheric and Ionospheric Sources
%K Geomagnetic Field Variation and Asymmetric Rings Currents
%U http://www.oalib.com/paper/3125956