Study of Ionospheric Amplitude Scintillation during Geomagnetic Activities of 2012 at Low Latitude Region

G. A. Àlàgbé, O. O. Afolabi, T. A. Adagunodo, A. B. Rabiu, S. A. Akinwumi, S. A. Akinwumi, T. V. Omotosho

Abstract


The impact of scintillation on radio communications, geodesy, radar system and navigation cannot be underemphasized.  The first evident effect of space weather in the phase of radio signals and amplitude that passes over ionosphere is fluctuations. If there are intense fluctuations in the quality of the signals received, such signals might degrade or attenuate in quality. This phenomenon is referred to as scintillations. To study the effects of magnetic activity on scintillations, the percentage occurrence of scintillations has been separated for the five international quiet (Q) days and five international disturbed (D) days over Ilorin for the year 2012 which was obtained from world data centre Kyoto. The occurrences of S4 were recorded during quiet days than the disturbed days in the study area. Generally, occurrence of \(S_4\) was enhanced during pre-midnight hours but was suppressed during post-midnight hour both at quiet and disturbed days in Ilorin, Kwara State, Nigeria.

Keywords


Geomagnetic activities; Pre-midnight; Post-midnight; Scintillations’ occurrence; Low latitude; Ionosphere

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References


J. Aarons, The role of the ring current in the generation and inhibition of equatorial F-layer irregularities during magnetic storma, Radio Sci. 26 (1991), 1131 – 1149.

M. Aquino, T. Moore, A. Dodson, S. Waugh, J. Souter, F.S. Rodrigues, Implications of ionospheric scintillation for GNSS users in Northern Europe, J. Navig. 58 (2005), 241 – 256.

P.K. Banerjee, R.S. Dabas and B.M. Reddy, C and L band transionospheric scintillation experiment: some results for applications to satellite radio systems, Radio Sci. 27 (6) (1992), 955 – 969.

H.F. Johnston, Mean k-indices from twenty one magnetic observatories and five quiet and five disturbed days for 1942, Terr. Magn. Atmos. Elec. 47 (1943), 219, doi:10.1029/TE048i004p00219.

D. Lars, J. Aleksandar, B. Andrew, W. Derek and G. Suman, Ionospheric Measurement with GPS:

Receiver Techniques and Methods. Radio Science 43 (2008) (RS6002), 1 – 11.

G. Li, B. Ning, L. Liu, Z. Ren, J. Lei and S.Y. Su, The correlation of longitudinal/seasonal variations of evening equatorial pre-reversal drift and of plasma bubbles, Ann. Geophys. 25 (2007), 2571 – 2578.

G. Li, B. Ning, Z. Ren and L. Hu, Statistics of GPS ionospheric scintillation and irregularities over polar regions at solar minimum, GPS Solut. 14 (2010), 331 – 341, doi:10.1007/s10291-009-0156-x.

S. Mukherjee, S. Sarkar, P.K. Purohit and A.K. Gwal, Study of GPS ionospheric scintillations over equatorial anomaly station Bhopal, International Journal of Advances in Earth Sciences 1 (2012), 39 – 48.

S. Tiwari, S. Sarkar, A. Vishwakarma and A.K. Gwal, Effect of magnetic activity on scintillation at equatorial region during low solar activity, Advances in Physics Theories and Applications 19 (2013), 122 – 129.




DOI: http://dx.doi.org/10.26713%2Fjims.v9i2.729

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