Kishore, Amol N. and Kumar, Sushil and Kumar, Vickal V. (2023) Large Scale Traveling Ionospheric Disturbances during geomagnetic storms in the Australian region. [Conference Proceedings]
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Abstract
Large-scale travelling ionospheric disturbances (LSTIDs) are detected using the critical frequency of the F2 layer (foF2) of the ionosphere. The HF interferometry (HF-Int) technique is applied to the network of ionosondes in the Australian region to detect and estimate propagation parameters. Here we present traveling ionospheric disturbances (TIDs) characteristics (period, velocity, and intensity) associated with selected geomagnetic storms. The TID response during geomagnetic storms varies significantly owing to the differing storm evolution patterns. Results show the morphology of parameters detected continually changes with time corresponding to highly dynamic response effects on the ionosphere. TIDs detected had a wide range of velocity magnitudes (mean ± standard deviation) such as 687 ± 16 m/s during onset phase, 516 ± 125 m/s during main phase and 569 ± 91 m/s during the recovery phase of the storm presented here. Propagation directions are predominantly equatorward with east and west deviations owing to higher latitude source generations associated with storm induced intensifications. The HF-Int system uses spectral techniques to estimate the dominant period and outputs the spectral energy contribution (SEC) which is a measure of the contribution of the TID to the total variability of the time series. TID activity levels are based on SEC criteria mostly indicated moderate and weak events with a range of periods 60 – 140 min.
| Item Type: | Conference Proceedings |
|---|---|
| Subjects: | Q Science > QC Physics > QC717.6-718.8 Plasma physics. Ionized gases Q Science > QC Physics > QC811-849 Geomagnetism |
| Divisions: | School of Information Technology, Engineering, Mathematics and Physics (STEMP) |
| Depositing User: | Amol Kishore |
| Date Deposited: | 07 Oct 2023 03:24 |
| Last Modified: | 07 Oct 2023 03:24 |
| URI: | https://repository.usp.ac.fj/id/eprint/14249 |
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