Impact of magnetic activity on occurrence of ionospheric amplitude scintillation over Lagos, Nigeria

Afolabi, Oluwafolafunmi; Adagunodo, T. A.; Akinwumi, S. A.; Usikalu, M.R.; Ayorinde, Toyese Tunde; Rabiu, Babatunde

doi:10.23919/radio.2017.8242229

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…For many storm-time applications, space weather scientists are most interested in the power delivered to the cross-section of the dayside magnetosphere. One version of power estimates the Akasofu epsilon parameter (ε), which is obtained by multiplying the effective solar wind Poynting flux by a factor proportional to the cross-sectional area of the magnetopause that intercepts the solar wind, as shown in Equation (13).…”

Section: Computation Of Akasofu's Parametermentioning

confidence: 99%

“…These gradients significantly disturb some types of communication and navigation signals (e.g., GNSS, high-frequency radar systems) [1]. The equatorial ionosphere presents phenomena such as equatorial ionization anomaly (EIA), equatorial temperature and wind anomaly (ETWA), equatorial trough anomaly (ETA), equatorial plasma bubble, ionospheric scintillations, and equatorial spread F (ESF) [2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Study and Modelling of the Impact of June 2015 Geomagnetic Storms on the Brazilian Ionosphere

Afolabi,

Candido,

Becker-Guedes

et al. 2024

Atmosphere

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This study investigated the impact of the June 2015 geomagnetic storms on the Brazilian equatorial and low-latitude ionosphere by analyzing various data sources, including solar wind parameters from the advanced compositional explorer satellite (ACE), global positioning satellite vertical total electron content (GPS-VTEC), geomagnetic data, and validation of the SAMI2 model-VTEC with GPS-VTEC. The effect of geomagnetic disturbances on the Brazilian longitudinal sector was examined by applying multiresolution analysis (MRA) of the maximum overlap discrete wavelet transform (MODWT) to isolate the diurnal component of the disturbance dynamo (Ddyn), DP2 current fluctuations from the ionospheric electric current disturbance (Diono), and semblance cross-correlation wavelet analysis for local phase comparison between the Sq and Diono currents. Our findings revealed that the significant fluctuations in DP2 at the Brazilian equatorial stations (Belem, dip lat: −0.47° and Alta Floresta, dip lat: −3.75°) were influenced by IMF Bz oscillations; the equatorial electrojet also fluctuated in tandem with the DP2 currents, and dayside reconnection generated the field-aligned current that drove the DP2 current system. The short-lived positive ionospheric storm during the main phase on 22 June in the Southern Hemisphere in the Brazilian sector was caused by the interplay between the eastward prompt penetration of the magnetospheric convection electric field and the westward disturbance dynamo electric field. The negative ionospheric storms that occurred during the recovery phase from 23 to 29 June 2015, were attributed to the westward disturbance dynamo electric field, which caused the downward E × B drift of the plasma to a lower height with a high recombination rate. The comparison between the SAMI2 model-VTEC and GPS-VTEC indicates that the SAMI2 model underestimated the VTEC within magnetic latitudes of −9° to −24° in the Brazilian longitudinal sector from 6 to 17 June 2015. However, it demonstrated satisfactory agreement with the GPS-VTEC within magnetic latitudes of −9° to 10° from 8 to 15 June 2015. Conversely, the SAMI2 model overestimated the VTEC between ±10° magnetic latitudes from 16 to 28 June 2015. The most substantial root mean square error (RMSE) values, notably 10.30 and 5.48 TECU, were recorded on 22 and 23 June 2015, coinciding with periods of intense geomagnetic disturbance.

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Section: Computation Of Akasofu's Parametermentioning

confidence: 99%