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Annales Geophysicae An open-access journal of the European Geosciences Union
Ann. Geophys., 35, 525-533, 2017
http://www.ann-geophys.net/35/525/2017/
doi:10.5194/angeo-35-525-2017
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Regular paper
05 Apr 2017
Longitudinal, seasonal and solar cycle variation in lunar tide influence on the equatorial electrojet
Endawoke Yizengaw1 and Brett A. Carter2 1Institute for Scientific Research, Boston College, Chestnut Hill, Massachusetts, USA
2SPACE Research Centre, RMIT University, Melbourne, Victoria, Australia
Abstract. It has been well documented that the lunar tidal waves can modulate the ionospheric electrodynamics and create a visible influence on the equatorial electrojet (EEJ). The lunar tide influence gets intensified around noon, primarily during new and full Moon periods. However, the longitudinal, seasonal and solar cycle variability in the lunar tide influence on ionospheric current systems is not well understood yet. In order to investigate this, 17 years (1998–2014) of extensive magnetometer observations at four longitudinal sectors (western American, western and eastern African, and Asian) have been analyzed. All observations performed during magnetically active periods (Kp>3) have been excluded for this study to eliminate storm contributions to the geomagnetic field variation at the geomagnetic equator. This study's quantitative analysis revealed significant longitudinal, seasonal and solar cycle dependence of the lunar tide influence on the equatorial electrojet.

Citation: Yizengaw, E. and Carter, B. A.: Longitudinal, seasonal and solar cycle variation in lunar tide influence on the equatorial electrojet, Ann. Geophys., 35, 525-533, doi:10.5194/angeo-35-525-2017, 2017.
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Short summary
The lunar tide influence on the equatorial electrojet (EEJ) gets intensified around noon, primarily during new and full Moon periods. However, the longitudinal, seasonal and solar cycle variability in the lunar tide’s influence on ionospheric current systems is not well understood yet. In order to investigate this, 17 years (1998–2014) of extensive magnetometer observations at four longitudinal sectors (western American, western and eastern African, and Asian) have been analyzed.
The lunar tide influence on the equatorial electrojet (EEJ) gets intensified around noon,...
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