Articles | Volume 35, issue 3
Ann. Geophys., 35, 701–710, 2017
https://doi.org/10.5194/angeo-35-701-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Special issue: The 14th International Symposium on Equatorial Aeronomy
Regular paper 06 Jun 2017
Regular paper | 06 Jun 2017
Studying the variability in the diurnal and seasonal variations in GPS total electron content over Nigeria
Victor Adetayo Eyelade et al.
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Nonlin. Processes Geophys. Discuss., https://doi.org/10.5194/npg-2020-47, https://doi.org/10.5194/npg-2020-47, 2020
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Bolarinwa J. Adekoya, Babatunde O. Adebesin, Timothy W. David, Stephen O. Ikubanni, Shola J. Adebiyi, Olawale S. Bolaji, and Victor U. Chukwuma
Ann. Geophys., 37, 171–182, https://doi.org/10.5194/angeo-37-171-2019, https://doi.org/10.5194/angeo-37-171-2019, 2019
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We present the dynamics of perturbations during a solar eclipse using rare parameters for eclipse study. Reduction in solar radiation and natural gas heating are the cause of the observed changes. The use of the bottomside F-layer parameters to probe the topside ionosphere established their interrelationship. The implication is that eclipse-caused perturbation could be better explained using some ionosonde parameters.
A. Babatunde Rabiu, Olanike Olufunmilayo Folarin, Teiji Uozumi, Nurul Shazana Abdul Hamid, and Akimasa Yoshikawa
Ann. Geophys., 35, 535–545, https://doi.org/10.5194/angeo-35-535-2017, https://doi.org/10.5194/angeo-35-535-2017, 2017
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This work examined the longitudinal variability of the equatorial electrojet (EEJ) and the occurrence of its counter electrojet (CEJ) using the available records of the horizontal component H of the geomagnetic field simultaneously recorded in the year 2009 along the magnetic equator in South American, African, and Philippine sectors. Our results indicate that the EEJ and CEJ undergo longitudinal variability. More ground observation data points are required in the African equatorial zone.
Olawale Bolaji, Oluwafisayo Owolabi, Elijah Falayi, Emmanuel Jimoh, Afolabi Kotoye, Olumide Odeyemi, Babatunde Rabiu, Patricia Doherty, Endawoke Yizengaw, Yosuke Yamazaki, Jacob Adeniyi, Rafiat Kaka, and Kehinde Onanuga
Ann. Geophys., 35, 123–132, https://doi.org/10.5194/angeo-35-123-2017, https://doi.org/10.5194/angeo-35-123-2017, 2017
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Movement of plasma to higher latitudes by EIA is known to relate to eastward electric field/EEJ and thermospheric meridional neutral wind. Experiments from GPS measurements that unveil thermospheric meridional neutral wind effect on plasma transportation in the F region are very few compared with electric field/EEJ. This work includes examples of thermospheric meridional neutral wind effects on GPS TEC measurements and their roles in transportation of plasma compared to electric field/EEJ.
A. B. Rabiu, B. O. Ogunsua, I. A. Fuwape, and J. A. Laoye
Nonlin. Processes Geophys., 22, 527–543, https://doi.org/10.5194/npg-22-527-2015, https://doi.org/10.5194/npg-22-527-2015, 2015
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This paper describes chaos and dynamical complexity to reveal the state of the underlying dynamics of the ionosphere on a daily basis. This is to show the daily/transient variations of chaoticity and dynamical complexity so as to reveal the degree of changes that occur in the ionospheric process and dynamics from one day to another. This paper will point the space science community in the direction of the use of chaoticity and dynamical complexity as indices to describe the process and dynamics.
E. Yizengaw, M. B. Moldwin, E. Zesta, C. M. Biouele, B. Damtie, A. Mebrahtu, B. Rabiu, C. F. Valladares, and R. Stoneback
Ann. Geophys., 32, 231–238, https://doi.org/10.5194/angeo-32-231-2014, https://doi.org/10.5194/angeo-32-231-2014, 2014
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Ann. Geophys., 31, 2085–2096, https://doi.org/10.5194/angeo-31-2085-2013, https://doi.org/10.5194/angeo-31-2085-2013, 2013
Special issue
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The study examined the diurnal and seasonal variations in total electron content (TEC) over Nigeria. The derived GPS TEC across all the stations demonstrated consistent minimum diurnal variations during the pre-sunrise hours, increased with a sharp gradient during the sunrise period, attained a postnoon maximum at about 14:00 LT, and then fell to a minimum just before sunset. The seasonal variation depicted a semi-annual distribution with higher values around equinoxes than solstices.
The study examined the diurnal and seasonal variations in total electron content (TEC) over...