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Analysis and Comparison of AWESOME Detected VLF Perturbations

Analysis and Comparison of AWESOME Detected VLF Perturbations. S. NAITAMOR 1 , M. A. ALABDOADAIM 2. 1 Centre de Recherche en Astronomie Astrophysique et Géophysique-Alegria . 2- Department of Physics, Sebha University-Libya. Outline. Analysis of Algeria AWESOME results

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Analysis and Comparison of AWESOME Detected VLF Perturbations

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  1. Analysis andComparisonof AWESOME Detected VLFPerturbations S. NAITAMOR1, M. A. ALABDOADAIM2 1 Centre de Recherche en Astronomie Astrophysique et Géophysique-Alegria. 2- Department of Physics, Sebha University-Libya

  2. Outline Analysis of Algeria AWESOME results Association between TLEs and Early VLF signal perturbations Are TLEs the unique cause of early VLF perturbations? Comparison between Algeria and Libya AWESOME results Can we observe an Early event by distant receiver ? Conclusions

  3. 12-13 October Events Sprite at 23:04:41 (38.06N 3.83E) Sprite at 22:51:35 (36.59N 3.32E) Elves at 00:32:00

  4. Tons=198ms Tons= 180 Direct Paths Scattered Path

  5. Direct Paths Scattered Paths Tons = 180ms Tons = 120 ms Circles Lightning near to the Elves time

  6. October 17-18 events Sprite at 20:59:32(39.98N 4.51E) Sprite at 21:28:27(40.1N 4.55E)

  7. Tons = 330ms Tons = 300ms Tons = 600ms Tons = 600ms

  8. 17-18 December events 18/12/2007 17/12/2007 Sprite at 23:09:48 Sprite at 01:43:59 The events were well situated for multi frequencies observations

  9. Tons = 48ms Sprite at 23:09:48 Tons= 40ms Tons=258ms

  10. Tons = 198ms Tons = 138ms Sprite at 01:43:59 Tons = 318ms

  11. Are TLEs the unique sources of VLF signal perturbations ? Last TLE was at 03:54:25 234mn after 00:00 What could be the sources of these perturbations ? No TLE was observed during this time interval

  12. What about the distant receiver data ? No Signal perturbation was observed by the receiver at Sebha even though the CG locations were near the GCPs from HWU, GQD and NRK to Sebha

  13. Conclusion • Near receiver results showed that Early VLF perturbation due to TLE may have different scattering process. • The scattering process plays an important role in determining the onset time and the amplitude of the VLF signal perturbation. • In absence of TLEs, supplementary ionization can occur due to Lightning discharges which can affect the VLF signal. • Sebha (Libya) AWESOME receiver results showed clearly that not all the VLF perturbations survived the long distance to the receiver, event if the activity is close to the GCP.

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