Investigation of the annual solar eclipse by using Total Electron Content (TEC) measurements

This research investigates the ionosphere response to the annual solar eclipse on 26
^th
January 2009 over Indonesia and Singapore. During solar eclipse, ionosphere will be affect due to the partial or complete obstruction of solar emission. It makes the number of electrons and ions decreases. There are several factors that will contribute to the ionosphere response which are the level of solar and geomagnetic disturbances, geographical latitude and longitude and local time. There are some methods that use to determine the behavior of ionosphere response during solar eclipse. It includes ionosonde measurements, incoherent scatter radar (ISR) and Global Positioning System (GPS) satellite. In this research, GPS satellite is use in order to investigate the ionosphere response. This research focuses on the measurement of Total Electron Content (TEC) obtained from two GPS station which are Bako in Indonesia and Ntus in Singapore. The location of these three GPS stations from the path of solar eclipse occur is different. The data is obtained a day before and during solar eclipse. From the findings it shows that TEC level will reduce during solar eclipse due to the reduction of ionizing radiation.