Influences of the solar incidents on the Ionosphere

The outmost layer of the atmosphere is called Ionosphere. This region is a natural plasma which is formed by the ionized molecules by high energy radiation comes from Sun. So, the content of the Ionosphere are made up of by the positive ions and free electrons. Content of the free electrons is called as Total Electron Content (TEC) and this is expressed by the number of free electrons on a cylinder which has one meter square cross sectional area. This electron content which is free in the ionosphere is highly effective on the radio signals that emits from earth or comes from space. The signal path varies according to the amount of the electrons. Starting from these dynamics, the predictions according to the Ionospheric TEC values could be made by looking to the affects of the electromagnetic signals, emitted from the GNSS (Global Navigation Satellite System) network, and to the delay of the duration time to reach the receiver. In this study, the influences of the solar incidents on the TEC variations have been examined.