Speaker
Description
This study presents observations of large- and medium-scale poleward travelling ionospheric disturbances (TIDs) originating from the geomagnetic equator over the African-European sector during the 15-19 July 2012 geomagnetic storm. The observation of poleward TIDs were made using the Global Navigation Satellite Systems (GNSS) total electron content (TEC) data to obtain the two dimensional (2-D) TEC residuals. Five cases of poleward TIDs were identified during this storm. Poleward TIDs propagation velocities and periods are in the range of 230-407 m/s and 32-90 minutes, respectively. On 15 July 2012, a significant 𝚫TEC depletion was observed simultaneously across all latitudes following the occurrence of poleward-propagating TIDs. During the period of 𝚫TEC depletion, a downward equatorial electrojet (EEJ) was observed, associated with storm-time westward penetration electric fields and disturbance dynamo electric fields. It is suggested that the sources of these poleward TIDs are likely related to increasing Lorentz coupling due to changes in the EEJ and the morning-moving solar terminator.
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