Longitudinal Variation of EEJ Current during Different Phases of Solar Cycle

2017 International Conference on Space Science and Communication

物理学;无线电电子学

Ismail, W.N.I.^1 ; Hamid, N.S.A.^1 ; Abdullah, M.^2,3 ; Yoshikawa, A.^4,5 ; Uozumi, T.^4,5

School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Selangor

43600 UKM, Malaysia^1

Space Science Centre (ANGKASA), Institute of Climate Change, Universiti Kebangsaan Malaysia, Bangi, Selangor

43600 UKM, Malaysia^2

Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, Selangor

43600 UKM, Malaysia^3

Department of Earth and Planetary Sciences, Faculty of Sciences, 33 Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka

812-8581, Japan^4

International Center for Space Weather Science and Education (ICSWSE), Kyushu University 53, 6-10-1 Hakozaki, Higashi-ku, Fukuoka

812-8581, Japan^5

关键词: Current component;    Current flows;    Equatorial electrojet;    Ground based measurement;    Ground magnetometer;    Longitudinal variations;    Magnetic data;    Three phasis;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/852/1/012019/pdf
DOI  :  10.1088/1742-6596/852/1/012019

来源: IOP

【 摘 要 】

The equatorial electrojet (EEJ) is an eastward current flow around the dip equator in E-region of the ionosphere within the range of 90 to 120 km altitude. The longitudinal variation of EEJ was studied using the ground-based measurement from six different longitudinal sectors. The ground magnetometer data were provided by magnetometer networks such as those from Magnetic Data Acquisition System (MAGDAS) /Circum-pan Pacific Magnetometer Network (CPMN), Indian Institute of Geomagnetism (IIG) and International Real-time Magnetic Observatory Network (INTERMAGNET). The EUEL index used in this study was calculated from geomagnetic northward H component. The H-component was normalized to the dip equator using the CM4 model. This study present results of the longitudinal variation of EEJ during the three phases of solar cycle 24: solar minimum (2008), inclination phase (2011) and solar maximum (2014). Results show that EEJ current is higher in the American sector and lowest between African and Indian sector in 2008 and 2011. On the other hand, during the year of solar maximum, this current component is comparable in American and Southeast Asian sector.