A tomographic study of seasonal variations of the equatorial anomaly in the Asian Sector

The Low-latitude Ionospheric Tomography Network (LITN) is used to investiga te the seasonal behavior of the equatorial anomaly in the Asian Sector duri ng a period of solar minimum. Seasonal variations of the location, the time of occurrence, and the height and the electron density of the maximum peak of the anomaly are studied, The starting time for the development of the a nomaly and the lifetime of the whole phenomenon are also investigated. Exte nsion of the work for possible 4D monitoring of the ionosphere using COSMIC data is discussed.