TY  - JOUR
A1  - Soares, Gabriel
A1  - Yamazaki, Yosuke
A1  - Matzka, Jürgen
A1  - Pinheiro, Katia
A1  - Stolle, Claudia
A1  - Alken, Patrick
A1  - Yoshikawa, Akimasa
A1  - Uozumi, Teiji
A1  - Fujimoto, Akiko
A1  - Kulkarni, Atul
T1  - Longitudinal variability of the equatorial counter electrojet during the solar cycle 24
JF  - Studia geophysica et geodaetica
N2  - Ground and space-based geomagnetic data were used in the investigation of the longitudinal, seasonal and lunar phase dependence of the equatorial counter electrojet (CEJ) occurrence in the Peruvian, Brazilian, African, Indian and Philippine sectors during geomagnetically quiet days from the solar cycle 24 (2008 to 2018). We found that CEJ events occur more frequently during the morning (MCEJ) than in the afternoon (ACEJ). The highest MCEJ and ACEJ occurrence rates were observed for the Brazilian sector. Distinct seasonal dependence was found for each longitudinal sector under investigation. The lunar phase dependence was determined for the first time for the Philippine sector (longitude 125 degrees E), and it was shown to be less pronounced than in the Peruvian, Brazilian and African sectors. We demonstrate that differences in CEJ rates derived from ground-based and satellite data can arise from the longitudinal separation between low-latitude and equatorial stations that are used to determine the signal and its consequent time delay in their sunrise/sunset times at ionospheric heights.
KW  - geomagnetism
KW  - equatorial ionosphere
KW  - geomagnetic observatories
KW  - satellite data
Y1  - 2019
U6  - https://doi.org/10.1007/s11200-018-0286-0
SN  - 0039-3169
SN  - 1573-1626
VL  - 63
IS  - 2
SP  - 304
EP  - 319
PB  - Springer
CY  - New York
ER  -