TY - JOUR
T1 - Empirical model of equatorial electrojet based on ground-based magnetometer data during solar minimum in fall 3. Space science
AU - Hamid, Nurul Shazana Abdul
AU - Liu, Huixin
AU - Uozumi, Teiji
AU - Yoshikawa, Akimasa
N1 - Funding Information:
The authors thank all the member of the MAGDAS project for their cooperation and contribution to this study. Financial support was provided by the Universiti Kebangsaan Malaysia and Ministry of Education, Malaysia, using grants GGPM-2015-020 and FRGS/1/2015/ST02/UKM/02/1. H. Liu is supported by JSPS KAKENHI Grant Numbers 15K05301, 15H02135, and 15H03733. T. Uozumi and A. Yoshikawa were supported in part by JSPS Core-to-Core Program (B. Asia-Africa Science Platforms), Formation of Preliminary Center for Capacity Building for Space Weather Research.
Publisher Copyright:
© 2015 Hamid et al.
PY - 2015/12/1
Y1 - 2015/12/1
N2 - In this study, we constructed an empirical model of the equatorial electrojet (EEJ), including local time and longitudinal dependence, based on simultaneous data from 12 magnetometer stations located in six longitude sectors. An analysis was carried out using the equatorial electrojet index, EUEL, calculated from the geomagnetic northward H component. The magnetic EEJ strength is calculated as the difference between the normalized EUEL index of the magnetic dip equator station and the normalized EUEL index of the off-dip equator station located beyond the EEJ band. Analysis showed that this current is always strongest in the South American sector, regardless of local time (LT), and weakest in the Indian sector during 0900 and 1000 LT, but shifted to the African sector during 1100 to 1400 LT. These longitude variations of EEJ roughly follow variations of the inversed main field strength along the dip equator, except for the Indian and Southeast Asian sectors. The result showed that the EEJ component derived from the model exhibits a similar pattern with measured EEJ from ground data during noontime, mainly before 1300 LT.
AB - In this study, we constructed an empirical model of the equatorial electrojet (EEJ), including local time and longitudinal dependence, based on simultaneous data from 12 magnetometer stations located in six longitude sectors. An analysis was carried out using the equatorial electrojet index, EUEL, calculated from the geomagnetic northward H component. The magnetic EEJ strength is calculated as the difference between the normalized EUEL index of the magnetic dip equator station and the normalized EUEL index of the off-dip equator station located beyond the EEJ band. Analysis showed that this current is always strongest in the South American sector, regardless of local time (LT), and weakest in the Indian sector during 0900 and 1000 LT, but shifted to the African sector during 1100 to 1400 LT. These longitude variations of EEJ roughly follow variations of the inversed main field strength along the dip equator, except for the Indian and Southeast Asian sectors. The result showed that the EEJ component derived from the model exhibits a similar pattern with measured EEJ from ground data during noontime, mainly before 1300 LT.
UR - http://www.scopus.com/inward/record.url?scp=84952303493&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84952303493&partnerID=8YFLogxK
U2 - 10.1186/s40623-015-0373-1
DO - 10.1186/s40623-015-0373-1
M3 - Article
AN - SCOPUS:84952303493
VL - 67
JO - Earth, Planets and Space
JF - Earth, Planets and Space
SN - 1343-8832
IS - 1
M1 - 205
ER -