Abstract
This paper investigates the diurnal variations of modelled and observed vertical total electron content (VTEC) over the African region (40° N to +40° S, 25° W to 65° E) obtained from ground-based global navigation satellite system (GNSS) receivers. The investigations on ionospheric response during the super geomagnetic storm time (March 17 2015) are crucial, especially over African low latitudes. Hence, the performance of ionospheric models has been evaluated in this paper. The VTEC predictability by regional/global ionospheric models (AfriTEC, IRI-2016, IRI-Plas 2017, GIM-CODE, and Nequick-G) is assessed by using root mean square error (RMSE) method and percentage deviation by comparing the GPS/GNSS-VTEC obtained from 10 IGS (International GNSS Service) stations with the modelled-VTEC values over the African region. The peculiarity in VTEC values is evident during the superstorm’s sudden commencement compared to the pre- and post-storm periods. Northern hemisphere GPS station TEC data showed a twin peak in the daily VTEC patterns. The enhanced VTEC values were observed over all the selected 10 IGS stations on the storm day than on other quiet days. Moreover, during the post-storm days (March 18–20, 2015), these VTEC values decreased more than on quiet days over the IGS stations in the southern hemisphere (MBAR, MAYG, HARB, SBOK). On the other hand, during the post-storm days (March 18–20, 2015), the VTEC values remained high over the geomagnetic northern hemisphere (NOT1, SFER, MAS1, CPVG, NKLG). It is worth mentioning that three northern IGS stations (NOT1, SFER, and MAS1) displayed a VTEC increase record of approximately 75–90% due to the extension of equatorial ionization anomaly (EIA) during the geomagnetic storm. In contrast, the other northern stations at the EIA trough region (CPVG, BJCO, NKLG) registered a VTEC increment of 7, 26, and 25%, respectively. Southern IGS stations registered an enhancement in VTEC of about 5%. The VTEC maps from AfriTEC, IRI-2016, and Nequick-G were able to predict the feature of EIA at around 20° N/15° S. The GPS-VTEC values at IGS stations located on the geomagnetic EIA crests (in both northern and southern hemispheres) and in the trough (equatorial stations) are higher than those of the IGS stations situated at mid-latitudes. AfriTEC, a regional model, recorded the lowest RMSE values over all the stations. The prediction results show that the regional model performance is better than the global ionospheric models (IRI-2016 and Nequick-G models), especially over EIA latitudes of the African region.
REFERENCES
Adewale, A.O., Oyeyemi, E.O., Adeloye, A.B., Mitchell, C.N., Rose, J.A., and Cilliers, P.J., A study of L-band scintillations and total electron content at an equatorial station, Lagos, Nigeria, Radio Sci., 2012, vol. 47, no. 2, pp. 1–12. https://doi.org/10.1029/2011RS004846
Ahoua, S.M., Habarulema, J.B., Obrou, O.K., Cilliers, P.J., and Zaka, Z.K., Evaluation of the NeQuick model performance under different geomagnetic conditions over South Africa during the ascending phase of the solar cycle (2009–2012), Ann. Geophys., 2018, vol. 36, no. 5, pp. 1161–1170. https://doi.org/10.5194/angeo-36-1161-2018
Akala, A.O. and Adewusi, E.O., Quiet-time and storm-time variations of the African equatorial and low latitude ionosphere during 2009–2015, Adv. Space Res., 2020, vol. 66, no. 6, pp. 1441–1459. https://doi.org/10.1016/j.asr.2020.05.038
Akala, A.O., Doherty, P.H., Carrano, C.S., Valladares, C.E., and Groves, K.M., Impacts of ionospheric scintillations on GPS receivers intended for equatorial aviation applications, Radio Sci., 2012, vol. 47, no. 4, pp. 1–11. https://doi.org/10.1029/2012RS004995
Akala, A.O., Seemala, G.K., Doherty, P.H., Valladares, C.E., Carrano, C.S., Espinoza, J., and Oluyo, S., Comparison of equatorial GPS-TEC observations over an African station and an American station during the minimum and ascending phases of solar cycle 24, Ann. Geophys., 2013, vol. 31, no. 11, pp. 2085–2096. https://doi.org/10.5194/angeo-31-2085-2013
Akala, A.O., Ejalonibu, A.H., Doherty, P.H., Radicella, S.M., Groves, K.M., Carrano, C.S., and Stoneback, R. A., Characterization of GNSS amplitude scintillations over Addis Ababa during 2009–2013, Adv. Space Res., 2017, vol. 59, no. 8, pp. 1969–1983. https://doi.org/10.1016/j.asr.2017.01.044
Akala, A.O., Oyeyemi, E.O., Arowolo, O.A., and Doherty, P.H., Characterization of GPS and EGNOS amplitude scintillations over the African equatorial/low-latitude region, Adv. Space Res., 2019, vol. 63, no. 9, pp. 3062–3075. https://doi.org/10.1016/j.asr.2019.01.021
Amaechi, P.O., Oyeyemi, E.O., and Akala, A.O., Geomagnetic storm effects on the occurrences of ionospheric irregularities over the African equatorial/low-latitude region, Adv. Space Res., 2018, vol. 61, no. 8, pp. 2074–2090. https://doi.org/10.1016/j.asr.2018.01.035
Anoruo, C.M., Rabiu, B., Okoh, D., Okeke, F.N., and Okpa-la, K.C., Irregularities in the African ionosphere associated with total electron content anomalies observed during high solar activity levels, Front. Astron. Space Sci., 2022, vol. 9, p. 947473. https://doi.org/10.3389/fspas.2022.947473
Ansari, K., Park, K.D., and Kubo, N., Linear time-series modeling of the GNSS based TEC variations over Southwest Japan during 2011–2018 and comparison against ARMA and GIM models, Acta Astron., 2019, vol. 165, pp. 248–258. https://doi.org/10.1016/j.actaastro.2019.09.017
Astafyeva, E., Zakharenkova, I., and Förster, M., Ionospheric response to the 2015 St. Patrick’s Day storm: A global multi-instrumental overview, J. Geophys. Res.: Space Phys., 2015, vol. 120, no. 10, pp. 9023–9037. https://doi.org/10.1002/2015JA021629
Basu, S., Groves, K.M., Quinn, J.M., and Doherty, P., A comparison of TEC fluctuations and scintillations at Ascension Island, J. Atmos. Sol.-Terr. Phys., 1999, vol. 61, no. 16, pp. 1219–1226. https://doi.org/10.1016/S1364-6826(99)00052-8
Bilitza, D., Altadill, D., Zhang, Y., Mertens, C., Truhlik, V., Richards, P., and Reinisch, B., The International Reference Ionosphere 2012: A model of international collaboration, J. Space Weather Space Clim., 2014, vol. 4, no. 7. https://doi.org/10.1051/swsc/2014004
Bilitza, D., Altadill, D., Truhlik, V., Shubin, V., Galkin, I., Reinisch, B., and Huang, X., International Reference Ionosphere 2016: From ionospheric climate to real-time weather predictions, Space Weather, 2017, vol. 15, no. 2, pp. 418–429. https://doi.org/10.1002/2016SW001593
Cander, L.R., Towards forecasting and mapping ionospheric space weather under COST actions, Adv. Space Res., 2013, vol. 31, no. 4, pp. 957–964. https://doi.org/10.1016/S0273-1177(02)00793-7
Carrington, R.C., Description of a singular appearance seen in the Sun on September 1, 1859, Mon. Not. R. Astron. Soc., 1859, vol. 20, no. 1, pp. 13–15. https://doi.org/10.1093/mnras/20.1.13
Chakraborty, S., Datta, A., Ray, S., Ayyagari, D., and Paul, A., Comparative studies of ionospheric models with GNSS and NavIC over the Indian longitudinal sector during geomagnetic activities, Adv. Space Res., 2020, vol. 66, no. 4, pp. 895–910. https://doi.org/10.1016/j.asr.2020.04.047
Chekole, D.A., Giday, N.M., and Nigussie, M., Performance of NeQuick-2, IRI-Plas 2017 and GIM models over Ethiopia during varying solar activity periods. J. Atmos. Sol.-Terr. Phys., 2019, vol. 195, p. 105117. https://doi.org/10.1016/j.jastp.2019.105117
Cherniak, I. and Zakharenkova, I., NeQuick and IRI-Plas model performance on topside electron content representation: Spaceborne GPS measurements, Radio Sci., 2016, vol. 51, no. 6, pp. 752–766. https://doi.org/10.1002/2015RS005905
Cilliers, P.J. and Olwendo, J., Observations of ionospheric irregularities in the low and mid latitude regions across the Africa–Europe sector during 2014, at the peak of solar cycle 24, in 2020 XXXIII General Assembly and Scientific Symposium of the International Union of Radio Science, IEEE, 2020, pp. 1–3. https://doi.org/10.23919/URSIGASS49373.2020.9232339
D’Angelo, G., Piersanti, M., Alfonsi, L., Spogli, L., Clausen, L. B. N., Coco, I., and Baiqi, N., The response of high latitude ionosphere to the 2015 St. Patrick’s Day storm from in situ and ground based observations, Adv. Space Res., 2018, vol. 62, no. 3, pp. 638–650. https://doi.org/10.1016/j.asr.2018.05.005
Danilov, A.D., Prestorm ionospheric disturbances: Precursors or Q-disturbances?, Adv. Space Res., 2022, vol. 69, no. 1, pp. 159–167. https://doi.org/10.1016/j.asr.2021.09.027
Danilov, A.D. and Konstantinova, A.V., Behavior of the ionospheric F region prior to geomagnetic storms, Adv. Space Res., 2019a, vol. 64, no. 7, pp. 1375–1387. https://doi.org/10.1016/j.asr.2019.07.014
Danilov, A.D. and Konstantinova, A.V., Ionospheric precursors of geomagnetic storms. I. A review of the problem, Geomagn. Aeron. (Engl. Transl.), 2019b, vol. 59, no. 5, pp. 554–566. https://doi.org/10.1134/S0016793219050025
Dugassa, T., Mezgebe, N., Habarulema, J.B., Habyarimana, V., and Oljira, A., Ionospheric response to the 23–31 August 2018 geomagnetic storm in the Europe–African longitude sector using multi-instrument observations, Adv. Space Res., 2023, vol. 71, no. 5, pp. 2269–2287. https://doi.org/10.1016/j.asr.2022.10.063
Ezquer, R.G., Scida, L.A., Orué, Y.M., Nava, B., Cabrera, M.A., and Brunini, C., NeQuick2 and IRI Plas VTEC predictions for low latitude and South American sector, Adv. Space Res., 2018, vol. 61, no. 7, pp. 1803–1818. https://doi.org/10.1016/j.asr.2017.10.003
Gonzalez, W.D., Joselyn, J.A., Kamide, Y., Kroehl, H.W., Rostoker, G., and Tsurutani, B.T., and Vasyliunas, V.M., What is a geomagnetic storm?, J. Geophys. Res.: Space Phys., 1994, vol. 99, no. 4, pp. 5771–5792. https://doi.org/10.1029/93JA02867
Gonzalez, W.D., Echer, E., Clua-Gonzalez, A.L., and Tsurutani, B.T., Interplanetary origin of intense geomagnetic storms (Dst < –100 nT) during solar cycle 23, Geophys. Res. Lett., 2007, vol. 34, no. 6. https://doi.org/10.1029/2006GL028879
Gulyaeva, T.L., International standard model of the Earth’s ionosphere and plasmasphere, Astron. Astrophys. Trans., 2003, vol. 22, nos. 4–5, pp. 639–643. https://doi.org/10.1080/10556790308565760
Gulyaeva, T.L., Arikan, F., and Stanislawska, I., Inter-hemispheric imaging of the ionosphere with the upgraded IRI-Plas model during the space weather storms, Earth, Planets Space, 2011, vol. 63, no. 8, pp. 929–939. https://doi.org/10.5047/eps.2011.04.007
Kane, R.P., Storm-time variations of F2, Ann. Geophys., 1973a, vol. 29, no. 1, pp. 25–42.
Kane, R.P., Global evolution of F2-region storms, J. Atmos. Sol.-Terr. Phys., 1973b, vol. 35, no. 11, pp. 1953–1966. https://doi.org/10.1016/0021-9169(73)90112-8
Kashcheyev, A., Migoya-Orué, Y., Amory-Mazaudier, C., Fleury, R., Nava, B., Alazo-Cuartas, K., and Radicella, S.M., Multivariable comprehensive analysis of two great geomagnetic storms of 2015, J. Geophys. Res.: Space Phys., 2018, vol. 123, no. 6, pp. 5000–5018. https://doi.org/10.1029/2017JA024900
Klobuchar, J.A., Ionospheric effects on GPS, in Global Positioning System: Theory and Applications, American Institute of Aeronautics and Astronautics, 1996, vol. 1, pp. 485–515.
Maltseva, O.A., Zhbankov, G.A., and Mozhaeva, N.S., Advantages of the new model of IRI (IRI-Plas) to simulate the ionospheric electron density: case of the European area, Adv. Space Res., 2013, vol. 11, no. 2, pp. 307–311. https://doi.org/10.5194/ars-11-307-2013
Matamba, T. M., and Danskin, D. W., Variation of TEC over South Africa during a geomagnetic storm, in 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC), IEEE, 2022, pp. 1–4. https://doi.org/10.23919/AT-AP-RASC54737.2022.9814299
Mengistu, E., Moldwin, M.B., Damtie, B., and Nigussie, M., The performance of IRI-2016 in the African sector of equatorial ionosphere for different geomagnetic conditions and time scales, J. Atmos. Sol.-Terr. Phys., 2019, vol. 186, pp. 116–138. https://doi.org/10.1016/j.jastp.2019.02.006
Moses, M., Dodo, J.D., Ojigi, L.M., and Lawal, K., Regional TEC modelling over Africa using deep structured supervised neural network, Geod. Geodyn., 2020, vol. 11, no. 5, pp. 367–375. https://doi.org/10.1016/j.geog.2020.05.004
Nava, B., Coisson, P., and Radicella, S.M., A new version of the NeQuick ionosphere electron density model, J. Atmos. Sol.-Terr. Phys., 2008, vol. 70, no. 15, pp. 1856–1862. https://doi.org/10.1016/j.jastp.2008.01.015
Nava, B., Rodríguez-Zuluaga, J., Alazo-Cuartas, K., Kashcheyev, A., Migoya-Orué, Y., Radicella, S.M., and Fleury, R., Middle-and low-latitude ionosphere response to 2015 St. Patrick’s Day geomagnetic storm, J. Geophys. Res.: Space Phys., 2016, vol. 121, no. 4, pp. 3421–3438. https://doi.org/10.1002/2015JA022299
Okoh, D., Seemala, G., Rabiu, B., Habarulema, J.B., Jin, S., Shiokawa, K., and Shetti, D., A neural network-based ionospheric model over Africa from Constellation Observing System for Meteorology, Ionosphere, and Climate and Ground Global Positioning System observations, J. Geophys. Res.: Space Phys., 2019, vol. 124, no. 12, pp. 10512–10532. https://doi.org/10.1029/2019JA027065
Okoh, D., Habarulema, J.B., Rabiu, B., Seemala, G., Wisdom, J.B., Olwendo, J., and Matamba, T.M., Storm-time modeling of the African regional ionospheric total electron content using artificial neural networks, Space Weather, 2020, vol. 18, no. 9, p. e2020SW002525. https://doi.org/10.1029/2020SW002525
Ramsingh, S.S., Sreekumar, S., Banola, S., Emperumal, K., Tiwari, P., and Kumar, B.S., Low-latitude ionosphere response to super geomagnetic storm of 17/18 March 2015: Results from a chain of ground-based observations over Indian sector, J. Geophys. Res.: Space Phys., 2015, vol. 120, no. 12, pp. 10 864–10 882. https://doi.org/10.1002/2015JA021509
Rawer, K. and Bilitza, D., Electron density profile description in the international reference ionosphere, J. Atmos. Terr. Phys., 1989, vol. 51, nos. 9–10, pp. 781–790. https://doi.org/10.1016/0021-9169(89)90035-4
Ray, S., Roy, B., Paul, K.S., Goswami, S., Oikonomou, C., Haralambous, H., and Paul, A., Study of the effect of 17–18 March 2015 geomagnetic storm on the Indian longitudes using GPS and C/NOFS, J. Geophys. Res.: Space Phys., 2017, vol. 122, no. 2, pp. 2551–2563. https://doi.org/10.1002/2016JA023127
Seemala, G.K., GPS-TEC analysis application, Tech. Rep., Institute for Scientific Research, Boston College, Boston, 2011.
Series, P., Ionospheric Propagation Data and Prediction Methods Required for the Design of Satellite Services and Systems, Recommendation ITU-R P.531-13, ITU, 2016.
Sivavaraprasad, G., Ratnam, D.V., Padmaja, R.S., Sharvani, V., Saiteja, G., Mounika, Y.S.R., and Harsha, P., Detection of ionospheric anomalies during intense space weather over a low-latitude GNSS station, Acta Geod. Geophys., 2017, vol. 52, no. 4, pp. 535–553. https://doi.org/10.1007/s40328-016-0190-4
Thomas, E.G., Baker, J.B.H., Ruohoniemi, J.M., Coster, A.J., and Zhang, S.R., The geomagnetic storm time response of GPS total electron content in the North American sector, J. Geophys. Res.: Space Phys., 2016, vol. 121, no. 2, pp. 1744–1759. https://doi.org/10.1002/2015JA022182
Timoçin, E., Inyurt, S., Temuçin, H., Ansari, K., and Jamjareegulgarn, P., Investigation of equatorial plasma bubble irregularities under different geomagnetic conditions during the equinoxes and the occurrence of plasma bubble suppression. Acta Astron., 2020, vol. 177, pp. 341–350. https://doi.org/10.1016/j.actaastro.2020.08.007
Uma, G., Brahmanandam, P.S., Kakinami, Y., Dmitriev, A., Devi, N.L., Kiran, K.U., and Chu, Y. H., Ionospheric responses to two large geomagnetic storms over Japanese and Indian longitude sectors, J. Atmos. Sol.-Terr. Phys., 2012, vol. 74, pp. 94–110. https://doi.org/10.1016/j.jastp.2011.10.001
Wu, C.C., Liou, K., Lepping, R.P., Hutting, L., Plunkett, S., Howard, R.A., and Socker, D., The first super geomagnetic storm of solar cycle 24: “The St. Patrick’s day event (March 17 2015)”, Earth, Planets Space, 2016, vol. 68, no. 1, pp. 1–12. https://doi.org/10.1186/s40623-016-0525-y
Yakovlev, O.I., Matyugov, S.S., and Vilkov, I.A., Attenuation and scintillation of radio waves in the Earth’s atmosphere from radio occultation experiments on satellite-to-satellite links, Radio Sci., 1995, vol. 30, no. 3, pp. 1591–1602. https://doi.org/10.1029/94RS01920
Zhang, S.R., Zhang, Y., Wang, W., and Verkhoglyadova, O.P., Geospace system responses to the St. Patrick’s Day storms in 2013 and 2015, J. Geophys. Res.: Space Phys., 2017, vol. 122, no. 6, pp. 6901–6906. https://doi.org/10.1002/2017JA024232
ACKNOWLEDGMENTS
The authors thank the support of the Koneru Lakshmaiah Education Foundation Greenfields, Vaddeswaram, Guntur India and University of Alberta, Canada, Department of Physics, Edmonton, Canada.
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Jean de Dieu Nibigira, Ratnam, D.V. & Sivakrishna, K. Performance Analysis of NeQuick-G, IRI-2016, IRI-Plas 2017 and AfriTEC Models over the African Region during the Geomagnetic Storm of March 2015. Geomagn. Aeron. 63 (Suppl 1), S83–S98 (2023). https://doi.org/10.1134/S0016793223600601
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DOI: https://doi.org/10.1134/S0016793223600601