Ionosphere is the important subject of extensive study in order to have better signals to be received in the communication process which is inevitable for mankind now a day. Ionospheric parameters strongly dependent on the solar conditions and on the complex behavior of the ionosphere, are very interesting for studying the complex phenomena and high degree of space time variability of the ionosphere occurring at the low, mid and high latitude regions. The effect of ionospheric parameter variation has great importance due to its unique features. The book is helpful to understand and predict the behavior of the ionospheric parameters that affects the radio communication. The auroral region's ionosphere is characterized by large diurnal and seasonal, Polar day and Polar night variations.TEC and scintillation activities were monitored at high latitude region Antarctica during 29th Indian Scientific Expedition to Antarctica. The present book aims to focus on statistical study of F-layer Ionospheric parameters those can be helpful in order to understand the magnitude of perturbation in the signals due to the nature of Ionosphere which is prone to disrupt the signals.