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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Study of the Ionospheric Effects of Selected Cases of Solar Flares over Abidjan
Author(s)
Jean Baptiste Ackah, Olivier Kouadio Obrou and Sylvain Malan Ahoua
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DOI:10.17265/2159-5348/2018.03.003
Affiliation(s)
Laboratoire de Physique de l’Atmosphère, Université Félix Houphouët Boigny Abidjan, 22 B.P. 582 Abidjan 22, Côte-d’Ivoire
ABSTRACT
The present study investigates the changes in
TEC (total electron content) and ionospheric scintillation index (S4)
inferred from the GNSS data recorded at the SCINDA station of Abidjan (Latitude
= 5.34° N, Longitude = 3.90° W) during and after a solar flare. In the course
of 2014, a year of high solar activity, three (3) cases of extreme (X1.66) and moderate (M6.23 and M2.13) solar flares recorded in the months of September and December effects
on the ionosphere have been studied using the X ray fluxes, the magnetic
parameters (Vx, Bz, Dst), the ionospheric
scintillation index S4 and TEC and its ROT (time rate of
change). The ROT exhibits a prominent peak between ten (10) and
twelve (12) minutes after the occurrence of the maximum peak of the time rate
of change of the X-ray flux emitted during the flare. The ROT maximum value
occurs simultaneously with an enhancement of the S4 index. Deferred
perturbations of the solar flare on the TEC in the SCINDA station of Abidjan
occur within 42 to 54 hours after an M-class solar flare and within 46 to 58
hours following an X-Class solar flare. The magnetic storms resulted from these flares show an increment of 20% on VTEC observed
when compared to the average VTEC (<VTECquiet>)
computed from the most five (5) quietest days of the selected months.
KEYWORDS
TEC, ionospheric scintillation, solar flare, X-ray.
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