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Hemispheric effects on ionospheric responses in the African sector

Hemispheric effects on ionospheric responses in the African sector We studied the responses of the ionosphere over the southern and northern African sector. A RINEX formatted TEC data obtained from the global positioning system (GPS) was used to study the impact of geomagnetic storms of 23rd June and 20th December on a South African station, SUTM (33.97°N, 6.84°W) and a Moroccan station, RABT (32.41°S, 38.75°E). The storms which occurred in summer and winter (solstice months) were quantified using the Dst data from World Data Center, Kyoto, Japan. The results showed obvious hemispheric and seasonal influences on ionospheric responses to the geomagnetic storms. The substorm-time responses of the ionosphere were always positive across the stations and seasons. This is a result of increased particle and energy depositions occasioned by the proton density (PD). The rates of energy and particles intensifications during substorms were higher in the summer storm event than in winter for both stations. In other words, there was no hemispheric asymmetry observed. In addition to the storm onset time, its peak time and hemispheric location are crucial in storm-time ionospheric responses. Local timing of the orientations of the prompt penetration and disturbance dynamo electric fields during northward interplanetary magnetic fields determined the nature of ionospheric responses in the day and night sides. These results contribute to our understanding of the dynamics and complexities of the ionosphere over African mid latitude ionosphere. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Astrophysics and Space Science Springer Journals

Hemispheric effects on ionospheric responses in the African sector

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Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer Nature B.V. 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
ISSN
0004-640X
eISSN
1572-946X
DOI
10.1007/s10509-023-04194-2
Publisher site
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Abstract

We studied the responses of the ionosphere over the southern and northern African sector. A RINEX formatted TEC data obtained from the global positioning system (GPS) was used to study the impact of geomagnetic storms of 23rd June and 20th December on a South African station, SUTM (33.97°N, 6.84°W) and a Moroccan station, RABT (32.41°S, 38.75°E). The storms which occurred in summer and winter (solstice months) were quantified using the Dst data from World Data Center, Kyoto, Japan. The results showed obvious hemispheric and seasonal influences on ionospheric responses to the geomagnetic storms. The substorm-time responses of the ionosphere were always positive across the stations and seasons. This is a result of increased particle and energy depositions occasioned by the proton density (PD). The rates of energy and particles intensifications during substorms were higher in the summer storm event than in winter for both stations. In other words, there was no hemispheric asymmetry observed. In addition to the storm onset time, its peak time and hemispheric location are crucial in storm-time ionospheric responses. Local timing of the orientations of the prompt penetration and disturbance dynamo electric fields during northward interplanetary magnetic fields determined the nature of ionospheric responses in the day and night sides. These results contribute to our understanding of the dynamics and complexities of the ionosphere over African mid latitude ionosphere.

Journal

Astrophysics and Space Science – Springer Journals

Published: May 1, 2023

Keywords: Solar quiet (Sq); Disturbance dynamo electric field (DDEF); Total electron content (TEC); Prompt penetration electric (PPEF); Geomagnetic storm event; Interplanetary (CME); Disturbance storm time (Dst); Hemispheric

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