Articles | Volume 35, issue 3
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:
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.
Studying the variability in the diurnal and seasonal variations in GPS total electron content over Nigeria
Victor Adetayo Eyelade
Centre for Atmospheric Research, National Space Research and
Development Agency, Anyigba, Nigeria
Adekola Olajide Adewale
Department of Physics, Faculty of Science, University of Lagos, Akoka,
Lagos State, Nigeria
Andrew Ovie Akala
Department of Physics, Faculty of Science, University of Lagos, Akoka,
Lagos State, Nigeria
Olawale Segun Bolaji
Department of Physics, Faculty of Science, University of Lagos, Akoka,
Lagos State, Nigeria
Centre for Atmospheric Research, National Space Research and
Development Agency, Anyigba, Nigeria
Related authors
No articles found.
Irewola Aaron Oludehinwa, Andrei Velichko, Olasunkanmi Isaac Olusola, Olawale Segun Bolaji, Norbert Marwan, Babaola O. Ogunsua, Abdullahi Ndzi Njah, and Timothy O. Ologun
EGUsphere, https://doi.org/10.5194/egusphere-2024-3554, https://doi.org/10.5194/egusphere-2024-3554, 2024
Short summary
Short summary
The contributing influence of SSW to regional ionosphere through chaos theory is examined. We found that ionospheric chaos is more pronounced in the European sector compared to Africa sector during SSW. Evidence of orderliness behavior in regional ionosphere of African sector was observed. Finally, we noticed that after the peak phase of SSW, ionospheric chaos is found to be more pronounced.
Theogene Ndacyayisenga, Jean Uwamahoro, Jean Claude Uwamahoro, Daniel Izuikedinachi Okoh, Kantepalli Sasikumar Raja, Akeem Babatunde Rabiu, Christian Kwisanga, and Christian Monstein
Ann. Geophys., 42, 313–329, https://doi.org/10.5194/angeo-42-313-2024, https://doi.org/10.5194/angeo-42-313-2024, 2024
Short summary
Short summary
This article reports the first observations of 32 type II bursts in cycle 25 from May 2021 to December 2022. The impacts of space weather on ionospheric total electron content (TEC) enhancement, as measured by the rate of change of TEC index (ROTI), are also studied. According to the current analysis, 19 of 32 type II bursts are connected with imminent space weather occurrences, such as radio blackouts and polar cap absorption events, indicating a high likelihood of space weather disturbance.
Irewola Aaron Oludehinwa, Olasunkanmi Isaac Olusola, Olawale Segun Bolaji, Olumide Olayinka Odeyemi, and Abdullahi Ndzi Njah
Nonlin. Processes Geophys., 28, 257–270, https://doi.org/10.5194/npg-28-257-2021, https://doi.org/10.5194/npg-28-257-2021, 2021
Short summary
Short summary
The MLE and ApEn values of the Dst indicate that chaotic and dynamical complexity responses are high during minor geomagnetic storms, reduce at moderate geomagnetic storms and decline further during major geomagnetic storms.
However, the MLE and ApEn values obtained from solar wind electric field (VBs) indicate that chaotic and dynamical complexity responses are high with no significant difference between the periods that are associated with minor, moderate and major geomagnetic storms.
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
A. O. Akala, G. K. Seemala, P. H. Doherty, C. E. Valladares, C. S. Carrano, J. Espinoza, and S. Oluyo
Ann. Geophys., 31, 2085–2096, https://doi.org/10.5194/angeo-31-2085-2013, https://doi.org/10.5194/angeo-31-2085-2013, 2013
Short summary
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...
Special issue