12:00 PM - 12:15 PM
[PEM12-36] Large scale traveling ionospheric disturbances origin and propagation
Keywords:LSTIDs, GNSS, ionosphere, geomagnetic storm, FACs, plasma irregularities
This approach was demonstrated for the case of the 19-21 December 2015 geomagnetic storm, when LSTIDs propagated over the European region were detected. During the main phase of the storm, the LSTIDs propagated equatorward from European high latitudes to middle latitudes (35-40N) with the horizontal velocities of ~700-800 m/s. The LSTIDs as deduced from the TEC-disturbed component had a much larger magnitude and propagate much longer distances during the daytime (sunlit part) than in the night. We found that an equatorward expansion of the strong ionospheric irregularities zone and an increase of the FACs magnitude led to a simultaneous intensification of the LSTIDs occurrence at high latitudes. The GPS ROTI (rate of TEC index) technique, a sensitive one for detection of the rapid ionospheric gradients and irregularities, could not recognize any signatures of the TIDs structures.
The research is supported by the NSF CAS AGS-1033112, the NASA LWS grant NNX15AB83G, by the National Science Centre, Poland, through grants 2017/25/B/ST10/00479 and 2017/27/B/ST10/02190, and by RFBR Grant 19-05-00570A.