Transient Variations of Total Electron Content (TEC) Over a Terrestrial Point within Magnetic Anomaly Region
Advances in Research,
This paper investigate the variability of Total Electron Content TEC over a terrestrial point within equatorial anomaly region using the NovAtel GSV 4000B GPS-SCINDA system at Akure (7.3°N, 5.2°E), Nigeria. This system is capable of tracking up to 14 GPS satellites simultaneously. Total Electron Content (TEC) over equatorial region using a real time data collected via a GPS-SCINDA facility were analyzed to study the ionospheric variations in terms of Total Electron Content (TEC) for the period of three years. Diurnal variations and Monthly mean variations of Total Electron Content within the equatorial anomaly region were examined. The diurnal variation of TEC showed pre-dawn minimum for a short period of time, followed by a steep early morning increase and then reached maximum value between 14:00 UT and 16:00 UT. The influence of solar activity on VTEC was investigated by taking the correlation coefficients between VTEC, F10.7cm radio flux index and sunspot numbers. The range of solar flux variation during the period of observation is very limited; there is high positive correlation (Correlation Coefficient 0.61) between daytime peak TEC and the solar F10.7 flux.
- Total electron content (TEC)
- solar activity
How to Cite
Hunsucker RD and Hargreaves JK. The high latitude Ionosphere and its effect on Radio propagation, Cambridge University Press; 1995.
Hammou Ali O, Zaourar N, Fleury R, Amory-Mazaudier C. Transient variations of vertical total electron content at low latitude during the period 2013–2017. Advances in Space Research; 2021.
Abdullah M, Ya’acob N and Ismail M. GPS total electron content (TEC) prediction at ionosphere layer over the equatorial region. World’s Largest Science, Technology & Medicine Open Access Book Publisher; 2009.
Ezquer RG, Brunini C, Mosert M, Meza A, Oviedo R, De V, Kiorcheff E, and Radicella. GPS–VTEC measurements and IRI predictions in the South American sector, Advances in Space Research. 2004;34:2035-2043.
Georg zur Bonsen, Daniel Ammann, Michael Ammann, Etienne Favey, Pascal Flammant. Continuous navigation combining GPS with sensor-based dead reckoning; 2005.
Jakowski N, Schluter S, Sardon E. Total electron Content of the ionosphere during the geomagnetic storm on 10 January 1997, Journal of Atmospheric and Solar-Terrestrial physics. 1998;6:299-307.
Rama Rao PVS, Gopi Krishna S, Niranjan K, Prasad SVVD. Temporal and spatial variations in TEC using simultaneous measurements from the Indian network of receivers during the low solar activity period of 2004-2005; Annales Geophysicae. 2006;24:3279-3292.
Klobuchar JA. “Ionospheric Effects on GPS”, in “Global Positioning System: Theoryand Applications, vol. 2”, edited by Parkinson, B W and Spilker, J J, Progress in Astronautics and Aeronautics. 1996;164:485.
Keith Grooves. SCINDA status & plans, lecture delivered at abdus salam international centre for theoretical physics (ICTP), Trieste, Italy; 2009.
Bagiya S Mala, Joshi HP, Iyer KN, Aggarwal M, Ravindran S, Pathan BM. TEC variations during low solar activity period (2005-2007) near the Equatorial Ionospheric Anomaly Crest Region in India, Annales Geophysicae. 2009;27:1047-1057.
Aarons J. A and Basu S. Ionospheric amplitude and phase fluctuations at the GPS frequencies. Proceedings of ION GPS-94, Seventh International Technical Meeting of the Satellite Division of the Institute of Navigation. 1994;1569-1578.
Kane RP. Irregular variations in the global distribution of total electron content, Radio Sci. 1980;15:837–842.
Mendillo M, Lynch FX, Klobuchar JA. Solar terrestrial predictions, vol. 4, edited by: Donneylly, R. F., Space Environment Lab, Boulder, Colorado, USA. 1980;C1–C14.
Modi RP, Iyer, KN. IEC and slab thickness near the peak of equatorial anomaly during sunspot maximum and minimum, Indian Journal of Radio and Space Physics. 1989;18:23–26.
Dabas RS. Ionosphere and its influence on radio communication, general article, radio and atmospheric sciences division New Delhi, India; 2000.
Rama Rao PVS, Niranjan K, Ramana Rao BV, Rao BVPS, Prasad DSV. Proc. URSI/IPS conference on the ionosphere and radiowave propagation Sydney, Australia; 1985.
Basu S and Basu S. Equatorial scintillations - a review. Journal of Atmospheric and Terrestrial Physics. 1981;43(5/6): 473-489.
Wan Salwa Hassan, Ahmad Faizal Mohd Zain, Abdul Ghaffar Ramli, Ho Yih Hwa, Mardinal Abdullah. Studies of Equatorial Total Electron Content near Solar Activity from 1998-2000; 2001.
Darg SC, Vijajyakumar PN, Singh I, Tyagi YR, Somayajulu VV. Early results of ATS-6 Radio beacon experiment at New Delhi, Indian Journal of Radio Space Physics. 1977;6:190-196.
Warnant R. The increase of ionospheric activity as measured by GPS, Earth Planets Space. 2000;52:1055–1060.
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