Longitudinal Profile of the Equatorial Electrojet Current and Its Dependence on Solar Activity

The equatorial electrojet (EEJ) is a strong eastward ionosphere current flowing in a narrow band along dip equator. It is flowing eastward in the dayside of equatorial E region of about 600 km wide and within 90 to 130 km altitude. The objectives of this research is to study the variations Equatorial Electrojet (EEJ) current measured from ground_based magnetometer. The data were provided by magnetometer network such as Magnetic Data Acquisition System (MAGDAS)/Circum-pan Pacific Magnetometer Network (CPMN), Indian Institute of Geomagnetism (IIG), International Real-time Magnetic Observatory Network (INTERMAGNET). We also request the data from the single observation station such as Fuquene (FUQ). The analysis is carried out using the EUEL index and normalization technique is applied to yield better results with the aids of CM4 current model. This involves fourteen stations in South America, African, Indian and Southeast Asian sectors. The analysis done are including longitudinal and solar activity dependence where the years revolves are 2008 and 2011. These two years represents the minimum phases of solar activity (2008) and inclining phases of solar activity (2011). The results obtained show that EEJ varies with longitudes and solar activity. EEJ current is found to be highest at the American sector and lowest between African and Indian sector. This current is also highest in inclination phase during 2011 compared to 2008 (solar minimum).