Global GPS Ionospheric Modelling Using Spherical Harmonic Expansion Approach

Global GPS Ionospheric Modelling Using Spherical Harmonic Expansion Approach

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In this study, we developed a global ionosphere model based Cap on measurements from a worldwide network of global positioning system (GPS).The total number of the international GPS reference stations for development of ionospheric model is about 100 and the spherical harmonic expansion approach as a mathematical method was used.In order to produce the ionospheric total electron content (TEC) based on grid form, we defined spatial resolution of 2.

0 degree and 5.0 degree in latitude and longitude, respectively.Two-dimensional TEC maps were constructed within the interval of one hour, and have a high temporal resolution compared to global Used Shoulder Pads ionosphere maps which are produced by several analysis centers.

As a result, we could detect the sudden increase of TEC by processing GPS observables on 29 October, 2003 when the massive solar flare took place.