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Annales Geophysicae
An interactive open-access journal of the European Geosciences Union
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- Editorial board
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IF 1.490
1.445CiteScore
2.9SNIP 0.789
SJR 0.74
index 88h5-index 21
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Volume 35, issue 3
Ann. Geophys., 35, 535–545, 2017
https://doi.org/10.5194/angeo-35-535-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/angeo-35-535-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Special issue: The 14th International Symposium on Equatorial Aeronomy
Ann. Geophys., 35, 535–545, 2017
https://doi.org/10.5194/angeo-35-535-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/angeo-35-535-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Regular paper 07 Apr 2017
Regular paper | 07 Apr 2017
Longitudinal variation of equatorial electrojet and the occurrence of its counter electrojet
A. Babatunde Rabiu et al.
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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.
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E. Yizengaw, M. B. Moldwin, E. Zesta, C. M. Biouele, B. Damtie, A. Mebrahtu, B. Rabiu, C. F. Valladares, and R. Stoneback
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Research on South Atlantic Anomaly (SAA) is conducted during active and normal period in certain phase of solar cycle 24. The result reveal SAA region has a tendency to be persistent during both period compare to other regions during the phase studied. Other regions in the research experience a tendency to be persistent and antipersistent. Based on the observation, the Earth magnetic field strength and the year the solar cycle phase occur may have an influence on the characteristic of a region.
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This research intends to characterize the South Atlantic Anomaly (SAA) by applying the power spectrum analysis approach. The outcomes of the research revealed that the SAA region had a tendency to be persistent during active periods and normal periods. It can be said that it experiences this characteristic because of the Earth’s magnetic field strength. It is very important for spacecraft entering the SAA to take safety precautions in order to minimize the damage.
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.
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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.
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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.
This work examined the longitudinal variability of the equatorial electrojet (EEJ) and the...
Annales Geophysicae
An interactive open-access journal of the European Geosciences Union
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