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Characteristic of Tweek Atmospherics Observed in Mid-latitude using AEWSOME VLF Receiver
並列摘要
This study presents the analysis of tweek atmospherics received by AWESOME VLF receiver at station of Gakona (62.71°N, 143.99°W) during four months observation from January to April 2011. Tweek which originates from lightning discharge are used to monitor the nighttime D-region ionosphere using the fundamental cut-off frequency to measure the variations of the lower ionosphere’s reflection height, the equivalent electron density at the reflection height and the propagation distance travel by tweeks. In this study, a total of 1316 tweeks are analyzed and from the analysis, it shows that equinox’s season has the highest tweek occurrence compared to winter season in March and April. The maximum harmonic (m) of t weeks is found to be up to fourth (m = 4) and tweeks with mode number one (m = 1) are more dominantly occurred. Our observations indicate that the equivalent electron densities for tweeks varies from 22-27 eL/cm^(3) in the altitude ranged of 75 to 91 km and demonstrate that these ELF/VLF signals travel considerable distances up to 6700 km from the causative lightning discharges. The ionospheric parameters for three locations (high, middle and low latitude respectively) were compared and the results show that they are almost consistent for all the locations.
延伸閱讀
- 白劍鴻（2007）。Using Chung-Li VHF radar to Study atmospheric gravity waves exciting by precipitation.〔碩士論文，國立中央大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0031-0207200917350977
- Su, S. Y., Yeh, H. C., Heelis, R. A., Wu, J. M., Yang, S. C., Lee, L. F., & Chen, H. L. (1999). The ROCSAT-1 IPEI Preliminary Results: Low-Latitude Ionospheric Plasma and Flow Variations. Terrestrial, Atmospheric and Oceanic Sciences, 10(4), 787-804. https://www.airitilibrary.com/Article/Detail?DocID=10170839-199912-10-4-787-804-a
- 黃建樺（2012）。Error analysis of Ionospheric TEC measure by using Formosat-3〔碩士論文，國立中央大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0031-1903201314450231
- Liu, J. Y., Chu, Y. H., Chen, M. Q., Tsai, L. C., & Huang, C. M. (2000). Modeling and Ground Observations of the Ionosphere Related to the COSMIC Project. Terrestrial, Atmospheric and Oceanic Sciences, 11(1), 349-364. https://www.airitilibrary.com/Article/Detail?DocID=10170839-200003-11-1-349-364-a
- Coker, C., Dymond, K. F., Budzien, S. A., Chua, D. H., Liu, J. Y., Anderson, D. N., Basu, S., & Pedersen, T. R. (2009). Observations of the Ionosphere Using the Tiny Ionospheric Photometer. Terrestrial, Atmospheric and Oceanic Sciences, 20(1), 227-235. https://www.airitilibrary.com/Article/Detail?DocID=10170839-200902-20-1-227-235-a