On ionospheric variability

I wrote this works on ionosphere for about five years. Portions of theses works were published in refereed journal papers and were presented in scientific conferences. While there are several important books written and numerous journal papers published on ionospheric variability study this book will describe how I started learning about ionosphere. This study is based on ionospheric total electron content (TEC) that is nothing but the electron counts in the unit cross-section path of a radio signal from an Earth orbiting satellite received at the ground. The thesis describes the measurement procedure of TEC and how TEC can be useful to explore the terrestrial ionosphere from a location where variability is strongest over the globe.