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The present study demonstrates the relationship between the high latitudenorthern hemispheric major sudden stratospheric warming (SSW) events and thereversal in the afternoon equatorial electrojet (EEJ), often called thecounter-electrojet (CEJ), during the winter months of 1998–1999, 2001–2002,2003–2004 and 2005–2006. As the EEJ current system is driven by tidal winds,an investigation of tidal variabilities in the MF radar observed zonal windsduring the winters of 1998–1999 and 2005–2006 at 88 km over Tirunelveli, asite close to the magnetic equator, shows that there is an enhancement ofsemi-diurnal tidal amplitude during the days of a major SSW event and asuppression of the same immediately after the event. The significance of thepresent results lies in demonstrating the latitudinal coupling between thehigh latitude SSW phenomenon and the equatorial ionospheric current systemwith clear evidence for major SSW events influencing the day-to-dayvariability of the CEJ

Variabilities of mesospheric tides and equatorial electrojet strength during major stratospheric warming events