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Pattern of latitudinal distribution of ionospheric irregularities in the African region and the effect of March 2015 St. Patrick's Day storm


Bolaji, OS and Adebiyi, SJ and Fashae, JB and Ikubanni, SO and Adenle, HA and Owolabi, C, Pattern of latitudinal distribution of ionospheric irregularities in the African region and the effect of March 2015 St. Patrick's Day storm, Journal of Geophysical Research: Space Physics, 125, (2) Article e2019JA027641. ISSN 2169-9380 (2020) [Refereed Article]


Copyright Statement

Copyright 2020 American Geophysical Union

DOI: doi:10.1029/2019JA027641


This paper investigates the latitudinal distribution of quiet and storm time irregularities over the African ionosphere in the month of March 2015. The average rate of change in total electron content (TEC) index (ROTIave) calculated from Global Positioning System data is used as a proxy for the irregularities. The result during the quiet condition shows that irregularities are mostly observed between 19:00 and 00:00 LT regardless of the hemisphere. Its appearance in the Southern Hemisphere is earlier, though with less severity mainly around the equatorward edge of the equatorial anomaly peak. The peak of its development occurred at 21:00 LT, as it is observed in all the latitudes except those outside the equatorial region. The strength is found to be most severe at 12 magnetic latitude (up to 1.10 TECU/min.) in the south. Beyond 18 magnetic latitude, it is rarely noticed in the south. However, it is not observed around this latitude in the north, indicating a major hemispheric asymmetry in terms of the latitudinal boundary between the Northern and Southern Hemispheres. Furthermore, its disappearance is found to be most rapid around the poleward verge of the equatorial anomaly region particularly in the Southern Hemisphere. In contrast to quiet time observations, irregularities were absent in all latitudes during the storm days considered. This can be attributed to the local time of the storm's onset and the possible imposition of westward electric fields in the dusk period.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Space sciences
Research Field:Mesospheric, thermospheric, ionospheric and magnetospheric physics
Objective Division:Environmental Management
Objective Group:Air quality, atmosphere and weather
Objective Field:Atmospheric processes and dynamics
UTAS Author:Bolaji, OS (Dr Olawale Bolaji)
ID Code:139982
Year Published:2020
Web of Science® Times Cited:5
Deposited By:Physics
Deposited On:2020-07-21
Last Modified:2020-08-19
Downloads:14 View Download Statistics

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