Abstract
In this study, the inter-comparison of various global vertical total electron contents are derived from Global Positioning System (GPS) networks worldwide. Based on observation data obtained from global network of dual frequency, the ionospheric variability on one full year, 2008 is studied through the vertical electron conten distribution GPS. The comparisons are aimed at comparability of the different vertical total electron content data sets in terms of absolute magnitude, capturing diurnal, seasonal variability globally. Total electron content (TEC) values were compared by computing the TEC differences among different stations. Most of the data sets exhibit expected diurnal variability with some differences on the absolute magnitude of vertical total electron content moreover, seasonally, the variability is also comparable. In this observation, highest vertical electron contents are observed on the Jet prolusion laboratory. It is followed by International global service, vertical total electron content and the least is observed on the Polytechnical University data sets.
Highlights
There are regions of the atmosphere which are defined by the variation of temperature
The vertical total electron content shows day to day variability due to the regular rotation of the Earth about its own axis following the apparent movement of the Sun
The lowest values of vertical total electron content (VTEC) are observed in UPC relative to other data sets for all seasons
Summary
There are regions of the atmosphere which are defined by the variation of temperature. They are defined by the temperature structure, density, composition, and degree of ionization. Throughout the atmosphere temperature varies with altitude, and so the different regions are defined by temperature. Global Positioning System (GPS) satellites in high altitude orbits (~20,200 km) are capable of providing details on the structure of the entire ionosphere, even the plasmasphere. A number of investigations have been used one of GPS data sets in the past. While the basis of selection of one data set over the other for a given study has never been formally presented, there is a need to know their relative accuracy and advantages over each other for the sake of comparing results of past and future studies. This study is conducted to fill this information gap and assess the level of agreements between different data sets so that future studies are based on objectively selected data sets by taking in to considerations the outcome of this study
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