Propagation of tweek atmospherics in earth ionosphere observe in Malaysia / Nurul Asyikin Mohd Daud
Lightning discharges produce ELF/VLF pulse signals propagate in EarthIonosphere waveguide over long distance with frequency dispersion characteristic known as tweeks atmospherics. This paper presents the observation of propagation of tweek atmospheric in Earth-ionosphere received at Selangor station...
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| Format: | Thesis |
| Language: | English |
| Published: |
2012
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| Subjects: | |
| Online Access: | https://ir.uitm.edu.my/id/eprint/78422/1/78422.pdf |
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| Summary: | Lightning discharges produce ELF/VLF pulse signals propagate in EarthIonosphere waveguide over long distance with frequency dispersion characteristic known as tweeks atmospherics. This paper presents the observation of propagation of tweek atmospheric in Earth-ionosphere received at Selangor station (2.92°N, 101.77°E). A total of 714 tweeks were recorded during 25 May 2010 and 19 June 2010. Observation on 25th May 2010 found that the electron density at reflection height of 84-93 km varies from 21 to 24 el/cm3 whereas on 19th June 2010 electron density at reflection height of 87-93 km varies from 21 to 23 el/cm3 . Using LIS data from GHCC, Two tweeks were found to originate from Nepal and Philippines Island. The reflection height and the estimated electron density for tweek from Nepal and Philippines were found between 87.21 km and 23.46 el/cm3 and 81.65 km and 25.06 el/cm3 respectively. It shows that tweek originated from Nepal has higher reflection height compared to the tweek from Philippines. |
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