GPS-TEC Variation during Low to High Solar Activity Period 2010-2014 under the Northern Crest of Indian Equatorial Ionization Anomaly RegionReport as inadecuate




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The measurements of ionospheric TEC total electron content are conducted at a low latitude Indian station Surat 21.16°N, 72.78°E Geog., which lies under the northern crest of the equatorial anomaly in Indian region. The data obtained are for a period of five years from low to high solar activity 2010- 2014 using GPS Global Positioning System receiver. In this study, we report the diurnal and seasonal variation of GPS-TEC, dependence of GPS-TEC with solar activity, geomagnetic condition and EEJ strength. From the seasonal analysis, it is found that greater values of the GPS-TEC are observed during equinox season followed by winter and summer. The appearance in the year 2011 and 2014 and disappearance in the year 2010 and 2012 of -winter anomaly- have been observed at the station. From the correlation of GPS-TEC with different solar indices, i.e. solar EUV flux, F10.7 cm solar radio flux and Zurich sunspot number SSN, it is concluded that the solar index EUV flux is a better controller of GPS-TEC, compared to F10.7 cm and SSN. Further, it is observed that there is no effect of rising solar activity on correlation. Moreover, the percentage variability of GPS-TEC and the standard deviation of GPS-TEC obtained for quiet and disturbed days show that dependence of GPS-TEC on geomagnetic condition is seasonal. Also, there is a positive correlation observed between GPS-TEC and EEJ strength.

KEYWORDS

Total Electron Content TEC, Equatorial Ionization Anomaly EIA, Solar Cycle, Equatorial Electrojet EEJ Strength

Cite this paper

Patel, N. , Karia, S. and Pathak, K. 2017 GPS-TEC Variation during Low to High Solar Activity Period 2010-2014 under the Northern Crest of Indian Equatorial Ionization Anomaly Region. Positioning, 8, 13-35. doi: 10.4236-pos.2017.82002.





Author: Nilesh C. Patel*, Sheetal P. Karia, Kamlesh N. Pathak

Source: http://www.scirp.org/



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