Articles | Volume 28, issue 2
https://doi.org/10.5194/npg-28-257-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/npg-28-257-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Magnetospheric chaos and dynamical complexity response during storm time disturbance
Irewola Aaron Oludehinwa
CORRESPONDING AUTHOR
Department of Physics, University of Lagos, Lagos, Nigeria
Olasunkanmi Isaac Olusola
Department of Physics, University of Lagos, Lagos, Nigeria
Olawale Segun Bolaji
Department of Physics, University of Lagos, Lagos, Nigeria
Department of Physics, University of Tasmania, Hobart, Australia
Olumide Olayinka Odeyemi
Department of Physics, University of Lagos, Lagos, Nigeria
Abdullahi Ndzi Njah
Department of Physics, University of Lagos, Lagos, Nigeria
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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
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.
Olumide Olayinka Odeyemi, Jacob Adeniyi, Olushola Oladipo, Olayinka Olawepo, Isaac Adimula, and Elijah Oyeyemi
Ann. Geophys., 36, 1457–1469, https://doi.org/10.5194/angeo-36-1457-2018, https://doi.org/10.5194/angeo-36-1457-2018, 2018
Short summary
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This paper investigates the combined relationship between the GPS TEC and DPS TEC, and validations of IRI TEC and NeQ TEC models. Our findings reveal the suitability of DPS TEC, IRI TEC, and NeQ TEC in place of GPS TEC. The DPS TEC predicts GPS TEC very well during the daytime when PEC contribution is often negligible; however, the dusk period requires a substantial correction. Thus, the changed TEC obtained could be used to improve models for the equatorial station in Africa.
Victor Adetayo Eyelade, Adekola Olajide Adewale, Andrew Ovie Akala, Olawale Segun Bolaji, and A. Babatunde Rabiu
Ann. Geophys., 35, 701–710, https://doi.org/10.5194/angeo-35-701-2017, https://doi.org/10.5194/angeo-35-701-2017, 2017
Short summary
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.
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.
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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.
The MLE and ApEn values of the Dst indicate that chaotic and dynamical complexity responses are...