Large scale traveling ionospheric disturbances during geomagnetic storms of 17 March and 23 June 2015 in the Australian region

Kishore, Amol N. and Kumar, Sushil (2023) Large scale traveling ionospheric disturbances during geomagnetic storms of 17 March and 23 June 2015 in the Australian region. Journal of Geophysical Research: Space Physics, 128 (11). NA. ISSN 2169-9402

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Abstract

Large scale traveling ionospheric disturbances (LSTIDs) can be detected using the critical frequency of F2 layer (foF2) of the ionosphere. The HF interferometry (HF-int) technique is applied to the ionosonde data from low and mid latitude stations over Australia. For the first time, we present a comparison of TIDs detected during the geomagnetic storms of 17 March and 23 June 2015. The TID response for these two comparable superstorms is significantly different owing to the differing storm evolution patterns. The storm associated TIDs are more intense and longer compared to the solar terminator. Results demonstrate that the morphology of parameters continually varies over time due to highly dynamic ionospheric response to geomagnetic storms. For the March storms, TIDs velocities were 400–700 m/s at the onset phase, ∼500 m/s during the main phase and ∼600 m/s during the recovery phase. Their propagation directions were equatorward with east/west deviations. Lower period (∼60 min) TIDs were determined during storm onset whereas higher periods (∼140 min) were detected during the recovery phase. The June storm produced a different response. The TID velocity at the onset phase was ∼500 m/s but during the main and recovery phases the velocities were greater than 1,000 m/s. There were large deviations in velocity vectors at the different stations suggesting multiple sources of TID generation and possible resonating effects at middle and low latitude stations. Our findings indicate that while TID detection and storm phases co-occur, the propagation characteristics of TIDs change dramatically throughout the storm.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	School of Information Technology, Engineering, Mathematics and Physics (STEMP)
Depositing User:	Ms Shalni Sanjana
Date Deposited:	23 Nov 2023 00:56
Last Modified:	23 Nov 2023 00:56
URI:	https://repository.usp.ac.fj/id/eprint/14322

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