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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers | Copyright
https://doi.org/10.5194/angeo-2018-80
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 06 Jul 2018

Regular paper | 06 Jul 2018

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This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Annales Geophysicae (ANGEO) and is expected to appear here in due course.

On the variability of the semidiurnal solar and lunar tides of the equatorial electrojet during sudden stratospheric warmings

Tarique A. Siddiqui1, Astrid Maute1, Nick Pedatella1, Yosuke Yamazaki2, Hermann Lühr2, and Claudia Stolle2,3 Tarique A. Siddiqui et al.
  • 1High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA
  • 2GFZ German Research Centre for Geosciences, Potsdam, Germany
  • 3Faculty of Science, University of Potsdam, Germany

Abstract. The variabilities of the semidiurnal solar and lunar tide of the equatorial electrojet (EEJ) are investigated during the 2003, 2006, 2009 and 2013 major sudden stratospheric warming (SSW) events in this study. For this purpose, the ground-magnetometer recordings at the equatorial observatories in Huancayo and Fuquene are utilized. Results show a major enhancement in the amplitude of the EEJ semidiurnal lunar tide in each of the four warming events. The EEJ semidiurnal solar tidal amplitude shows an amplification prior to the onset of warmings, a reduction during the deceleration of the zonal mean zonal wind at 60°N and 10hPa and a second enhancement a few days after the peak reversal of the zonal mean zonal wind during all the four SSWs. Results also reveal that the amplitude of the EEJ semidiurnal lunar tide becomes comparable or even greater than the amplitude of the EEJ semidiurnal solar tide during all these warming events. The present study also compares the EEJ semidiurnal solar and lunar tidal changes with numerical simulations of the variability of the migrating semidiurnal solar (SW2) and lunar (M2) tide in neutral temperature at ~120km altitude. A better agreement between the enhancements of the EEJ semidiurnal lunar tide and the M2 tide in neutral temperature is observed in comparison with the enhancements of the EEJ semidiurnal solar tide and the SW2 tide in neutral temperature.

Tarique A. Siddiqui et al.
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Tarique A. Siddiqui et al.
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Extreme meteorological events such as SSWs induce variabilities in the ionosphere by modulating the atmospheric tides and these variabilities can be comparable to a moderate geomagnetic storm. The equatorial electrojet (EEJ) is a narrow ribbon of current flowing over the dip equator in the ionosphere and is particularly sensitive to tidal changes. In this study, we use ground-magnetic measurements to investigate the semidiurnal solar and lunar tidal variabilities of the EEJ during SSWs.
Extreme meteorological events such as SSWs induce variabilities in the ionosphere by modulating...
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