Comparison of Ionospheric Total Electron Content (TEC) over Sonmiani (Pakistan) with NeQuick-2 and IRI-2012 during July 2014 – June 2015 |
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Authors: | Muhammmad Ayyaz Ameen Mehak Abdul Jabbar Xiao YU Weimin Zhen Ghulam Murtaza Farrukh Chishtie Haqqa Khursheed Muhammad Atiq |
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Institution: | 1. Pakistan Space and Upper Atmosphere Research Commission (SUPARCO), P.O. Box 8402, Karachi 75270, Pakistan;2. China Research Institute of Radiowave Propagation (CRIRP), P.O. Box 6301, Qingdao 266107, China;3. SERVIR-Mekong, Asian Disaster Preparedness Center, SM Tower, 24th Floor, 979/69 Paholyothin Road, Samsen Nai Phayathai, Bangkok 10400, Thailand;4. Institute of Space and Planetary Astrophysics (ISPA), University of Karachi, Karachi 75270, Pakistan |
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Abstract: | In this study, Total Electron Content (TEC) observations acquired by a GNSS receiver installed at Sonmiani (Geog. Coord. 25.19°N, 66.74°E, Geomag. Coord. 17.62°N, 141.5°E) are being reported for the first time. The data utilized is hourly instantaneous TEC values during 10 International Quiet Days (IQDs) per month from Jul-14 to Jun-15, totaling 120 observation days for monitoring nominal TEC. The findings confirm the semi-annual trend of TEC over Sonmiani, which lies at the northern crest of Equatorial Ionization Anomaly (EIA) region. The TEC measurements are then compared with NeQuick-2 and International Reference Ionosphere (IRI-2012) models. It was found that the TEC values derived from NeQuick-2 are in better agreement with GNSS measurements than those from IRI-2012. The TEC measurements also show seasonal variation which is largest during Equinox months. The TEC value in Dec solstice is higher than the Jun solstice, which confirms that the seasonal anomaly is playing a major role in this region during the course of study. |
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Keywords: | Total Electron Content (TEC) Equatorial Ionization Anomaly (EIA) Semi-annual trend Sonmiani |
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