JpGU-AGU Joint Meeting 2017

講演情報

[EE] ポスター発表

セッション記号 P (宇宙惑星科学) » P-EM 太陽地球系科学・宇宙電磁気学・宇宙環境

[P-EM14] [EE] Dynamics in magnetosphere and ionosphere

2017年5月20日(土) 10:45 〜 12:15 ポスター会場 (国際展示場 7ホール)

コンビーナ:堀 智昭(東京大学大学院理学系研究科)、田中 良昌(国立極地研究所)、中溝 葵(情報通信研究機構 電磁波計測研究所)、尾崎 光紀(金沢大学理工研究域電子情報学系)

[PEM14-P17] Latitudinal and Longitudinal Profile of EEJ current during different phases of Solar Cycle

*Nurul Shazana Abdul Hamid1Wan Nur Izzaty Ismail1Mardina Abdullah2,3Akimasa Yoshikawa4 (1.School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia、2.Space Science Centre (ANGKASA), Institute of Climate Change, Universiti Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia、3.Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia、4.International Center for Space Weather Science and Education (ICSWSE), Kyushu University 53, 6-10-1 Hakozaki, Higashi-ku,Fukuoka 812-8581,Japan)

キーワード:Equatorial electrojet, Latitudinal profile, Longitudinal profile, Solar cycle

Study of equatorial electrojet (EEJ) has always been one of the research interest in ionospheric field. EEJ current is an eastward current that flows within the range of ±3° at dip equator. In this study, we attempt to find the latitudinal and longitudinal profile of this ionospheric current. This research is carried on using data from magnetometer network 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 analysis is carried out using geomagnetic northward H component which is later used to calculate the magnetic component of EEJ. In order to correct the latitudinal effect causes by the location of observatories, we applied the normalization technique of observation data. The EEJ latitudinal profile is obtained and it shows that the current started to reverse westward at 5° latitude and not more than 10° latitude in both hemispheres. On the other hand, the longitudinal profile obtained shows that EEJ is higher in American sector and lowest between African and Indian sector in solar minimum (2008) and inclination phase (2011) of solar cycle. However, in solar maximum (2014), the EEJ current is found to be comparable between American and Southeast Asian sector. Moreover, our result agreed with previous study, showing that the Sq current does not vary with longitude, especially in solar minimum.