İyonosfer Haritalarının Uzay-Zaman İzgesel Analizi

Abstract

Short Wave (KD), which is in the frequency range of 3-30 MHz, radio wave propagation is one of the important methods used for long distance communication. It uses ionosphere and earth to transmit system communication signal. Ionsophere is atmospheric layer which is formed by gases ionized by sun rays. The ionsophere is affected by variables like sun flare, sun-earth dependent position, changes in magnetosphere and thermosphere. The changes and distruptions in ionosphere must be investigated as spatial and temporal to understand how ionosphere affects on radio signals. One of the most important parameter used for analyzing ionosphere structure is Total Electron Content(TEC) maps. The purpose of this study is to do spatial-spectral analysis of ionosphere. Firstly, AKD technique has been applied on TEC maps belong to equatorial region, then latitude, longitude and 2D most significant wavenumber values has been calculated by means of obtained AKD maps considering different energy bands. Calculated values have been compared to Dst , Ap and Kp geomagnetic indices. iv Geomagnetic indices are parameters used for measuring changes in ionosphere and magnetosphere. Correlation analysis has been applied to compare Dst , Ap and Kp geomagnetic indices with latitude, longitude, 2D most significant wavenumber value. Also an another method, DCT, sliding window and median calculations has been done for all earth TEC map of ionosphere. constant component and component which has the most significant energy after constant component values obtained by matrices that provided by this calculations are compared with Dst, Ap and Kp geomagnetic indices for different sliding window sizes and relationship between them has been examined