Articles | Volume 22, issue 5
https://doi.org/10.5194/npg-22-527-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/npg-22-527-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
The transient variation in the complexes of the low-latitude ionosphere within the equatorial ionization anomaly region of Nigeria
A. B. Rabiu
Space Physics Laboratory, Department of Physics, Federal University of Technology, Akure, Nigeria
Centre for Atmospheric Research, National Space Research and Development Agency, Anyigba, Nigeria
Space Physics Laboratory, Department of Physics, Federal University of Technology, Akure, Nigeria
I. A. Fuwape
Space Physics Laboratory, Department of Physics, Federal University of Technology, Akure, Nigeria
J. A. Laoye
Department of Physics, Olabisi Onabanjo University, Ago-Iwoye, Nigeria
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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
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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.
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
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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.
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.
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
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
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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
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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.
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
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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.
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.
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
B. O. Ogunsua, J. A. Laoye, I. A. Fuwape, and A. B. Rabiu
Nonlin. Processes Geophys., 21, 127–142, https://doi.org/10.5194/npg-21-127-2014, https://doi.org/10.5194/npg-21-127-2014, 2014
Related subject area
Subject: Bifurcation, dynamical systems, chaos, phase transition, nonlinear waves, pattern formation | Topic: Ionosphere, magnetosphere, planetary science, solar science
Ionospheric Chaos in Solar quiet Current due to Sudden Stratospheric Warming Events Across Europe-Africa Sector
Brief Communication: A modified Korteweg–de Vries equation for Rossby–Khantadze waves in a sheared zonal flow of the ionospheric E layer
Electron holes in a regularized kappa background
Magnetospheric chaos and dynamical complexity response during storm time disturbance
Compacting the description of a time-dependent multivariable system and its multivariable driver by reducing the state vectors to aggregate scalars: the Earth's solar-wind-driven magnetosphere
Derivation of the entropic formula for the statistical mechanics of space plasmas
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.
Laila Zafar Kahlon, Hassan Amir Shah, Tamaz David Kaladze, Qura Tul Ain, and Syed Assad Bukhari
Nonlin. Processes Geophys., 31, 1–6, https://doi.org/10.5194/npg-31-1-2024, https://doi.org/10.5194/npg-31-1-2024, 2024
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It is shown that sheared Rossby–Khantadze waves can propagate due to inhomogeneities, taking into account the Earth's angular velocity and the magnetic field. Along with the Hall conductivity, these waves can couple in the ionospheric E region.The novelty of the present work is the consideration of magnetic field inhomogeneity, which was not considered before and reduced our considered system of equations to a 1D modified KdV equation.
Fernando Haas, Horst Fichtner, and Klaus Scherer
Nonlin. Processes Geophys., 30, 277–287, https://doi.org/10.5194/npg-30-277-2023, https://doi.org/10.5194/npg-30-277-2023, 2023
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Electron holes have been reported in space plasmas along with suprathermal plasmas far from Maxwellian equilibrium. In particular, electron distributions with elongated suprathermal distributions (kappa distributions) are of current interest for space plasmas. This work considers regularized kappa distributions, which are well beyond the Maxwellian equilibrium and show a harder suprathermal electron population.
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
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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.
Joseph E. Borovsky and Adnane Osmane
Nonlin. Processes Geophys., 26, 429–443, https://doi.org/10.5194/npg-26-429-2019, https://doi.org/10.5194/npg-26-429-2019, 2019
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A methodology is developed to simplify the mathematical description of activity in a time-dependent driven system. The method describes the response in the system that is most-closely related to the driver. This reduced description has advantages: low noise, high prediction efficiency, linearity in the described system response to the driver, and compactness. The analysis of the Earth’s magnetospheric system is demonstrated.
George Livadiotis
Nonlin. Processes Geophys., 25, 77–88, https://doi.org/10.5194/npg-25-77-2018, https://doi.org/10.5194/npg-25-77-2018, 2018
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Kappa distributions are frequently used for modeling space plasmas, but their physical origin remains unknown. Recently we realized that the statistical origin of these distributions is not the classical Boltzmann entropy, but the Tsallis q entropy. Thereafter, the question was about the physical origin of this entropic formula. Here we show that the q entropy can be derived under first principles, i.e., by considering that the energy and entropy are additive quantities under certain conditions.
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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.
This paper describes chaos and dynamical complexity to reveal the state of the underlying...