Kumar, Sushil and Kishore, Amol N. and Ramachandran, Visagaperuman (2008) Higher harmonic tweek sferics observed at low latitude: estimation of VLF reflection heights and tweeks propagation distance. Annales Geophysicae, 26 . pp. 1451-1459. ISSN 0992-7689
Full text not available from this repository.Abstract
Lightning generated signals recorded at a low latitude station, Suva (18.2°S, 178.3°E) Fiji, in the South
Pacific region, during September 2003–July 2004, are used to study the propagation features and the reflection heights of tweek atmospherics in the waveguide formed by the Earth’s surface and the lower ionosphere. Tweeks are observed only during the local night and the maximum harmonic (n) recorded is six. The occurrence of tweeks with higher n progressively decreases as n increases. The dispersed part of tweeks decreases as n increases. The attenuation factor has been calculated for tweeks with n=1–3. The ionospheric reflection heights obtained assuming the transverse magneticmode of propagation for tweek signals vary from 83–92 km. A higher harmonic of the same tweek is reflected from about 2.0 km higher than the lower harmonic. For 90% of tweeks, propagation distances are estimated to be between 1000– 5000 km. Tweeks with lower n propagate longer distances than the tweeks with higher n.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
| Divisions: | Faculty of Science, Technology and Environment (FSTE) > School of Engineering and Physics |
| Depositing User: | Ms Neha Harakh |
| Date Deposited: | 11 Jan 2008 00:21 |
| Last Modified: | 11 Jul 2012 05:41 |
| URI: | https://repository.usp.ac.fj/id/eprint/191 |
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