Articles | Volume 35, issue 3
Ann. Geophys., 35, 525–533, 2017
https://doi.org/10.5194/angeo-35-525-2017

Special issue: The 14th International Symposium on Equatorial Aeronomy

Ann. Geophys., 35, 525–533, 2017
https://doi.org/10.5194/angeo-35-525-2017

Regular paper 05 Apr 2017

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 Endawoke Yizengaw and Brett A. Carter
  • 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.

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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.