資料載入中.....
|
請使用永久網址來引用或連結此文件:
https://irlib.pccu.edu.tw/handle/987654321/26854
|
| 題名: | Meridional electric fields in layer-type and clump-type plasma structures in midlatitude sporadic E region: Observations and plausible mechanisms |
| 作者: | Chu, YH (Chu, Y.H.)
Yang, KF (Yang, K.F.)
Wang, CY (Wang, C.Y.)
Su, CL (Su, C.L.) |
| 貢獻者: | Dept Phys |
| 關鍵詞: | QUASI-PERIODIC ECHOES
CHUNG-LI RADAR
INTERFEROMETRY INVESTIGATIONS
ALIGNED IRREGULARITIES
EQUATORIAL ELECTROJET
VHF RADAR
INSTABILITY
DIRECTION
WAVES |
| 日期: | 2013-03 |
| 上傳時間: | 2014-02-27 12:48:04 (UTC+8) |
| 摘要: | The use of multibased line interferometry technique operated by a VHF coherent scatter radar with relatively broad radar beam pattern makes it possible to reveal zonal drift velocity of 3 m field-aligned irregularities (FAIs) inside moving layer-type or clump-type plasma structures at kilometer scale. We present compelling evidences in this article showing that, no matter what types of the plasma structures, the apparent zonal drift velocity of the 3 m FAIs is always linearly dependent on the zonal trace velocity (or bulk velocity) of the kilometer-scale plasma structure. This feature seems to imply that the bulk motion of the large-scale plasma structure may significantly affect the observed 3 m FAI Doppler velocity, which should be removed to obtain true FAI drift velocity. In addition, there is an evident tendency for the 3 m FAIs in the layer-type plasma structure to drift in the same zonal direction as the moving plasma structure. However, the correlation between the drift direction of the 3 m FAIs and the moving direction of the large-scale plasma structure is indistinct for the clump-type plasma structure. The meridional electric fields estimated from the true zonal FAI drift velocities for the layer-type plasma structures moving in the west (east) direction point in the northward/upward (southward/downward) direction. Statistical results show that the mean value of the meridional electric field inside the layer-type plasma structure is approximately 2.7-2.8 mV/m, about one order of magnitude larger than that for the clump-type plasma structure. Mechanisms that are, respectively, responsible for the generations of the layer-type and clump-type plasma structures are discussed in this article. It is believed that neutral wind shear is very likely the main cause of the layer-type plasma structure formation, while the clump-type plasma structure may be associated with propagating gravity wave. |
| 關聯: | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Volume: 118 Issue: 3 Pages: 1243-1254 |
| 顯示於類別: | [光電物理系] 期刊論文
|
文件中的檔案:
| 檔案 |
描述 |
大小 | 格式 | 瀏覽次數 |
|---|
| index.html | | 0Kb | HTML | 602 | 檢視/開啟 |
|
在CCUR中所有的資料項目都受到原著作權保護.
|
