The study of QP echoes observed by the Chung-Li Radar
碩士 === 國立中央大學 === 太空科學研究所 === 92 === Sporadic E (Es) layers are ionization enhancements in the E region at altitude between 90 and 120 km. The density can be up to an order of magnitude greater than that in the background and the major species in the layer are metallic. High-resolution observations...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2004
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| Online Access: | http://ndltd.ncl.edu.tw/handle/19207540789186079501 |
| Summary: | 碩士 === 國立中央大學 === 太空科學研究所 === 92 === Sporadic E (Es) layers are ionization enhancements in the E region at altitude between 90 and 120 km. The density can be up to an order of magnitude greater than that in the background and the major species in the layer are metallic.
High-resolution observations of quasi-periodic (QP) structures of the midlatitude E region irregularities made with the MU radar were presented in 1991. The structures were found to display striations with periods close to the Brunt Vaisala period. After then, the Chung-Li radar observed the same phenomenon, too.
The physical mechanisms proposed for the generation of QP echoes are associated with gravity wave and wind shear. In this study we present an optimum postulate for the QP echoes observed at the Chung-Li VHF radar.
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