A study of the forenoon ionospheric F-2 layer behavior over the middle and upper atmospheric radar
文献类型：期刊论文
| 作者 | Zhang, SR; Oliver, WL; Fukao, S; Otsuka, Y |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 出版日期 | 2000-07-01 |
| 卷号 | 105期号:A7页码:15823-15833 |
| 英文摘要 | The middle and upper atmosphere (MU) radar incoherent Scatter observations of electron density N-e profiles for 1986-1995 at Shigaraki (34.85 degrees N, 136.10 degrees E) show a forenoon density depression (bite-out) in summer bo th on individual days and in statistical averages. The depression takes place generally between 0700 and 1200 LT, above the F-2 peak for low solar activity and around the F-2 peak for high solar activity. The maximum electron density NmF2 shows, in both percentage and time duration, a greater depression for low solar activity than for high solar activity. With increasing altitude, the forenoon N-e depression develops earlier for low solar activity. In combination with the MU radar observations of ion drifts and plasma; temperatures, our modeling indicates the following: (1) Transport processes such as the enhancement of electron temperature T-e, the poleward neutral wind, and the reduced upper boundary ionization density help to reduce N-e and result in a negative partial derivative N-e/partial derivative t in the morning hours in summer. Among those processes the morning enhancement of T-e is found to be most important for the presence of the forenoon bite-out, since it greatly increases the O+ diffusion such that ionization outflow is significantly intensified. (2) The forenoon bite-out occurs only in summer, not in other seasons, because the smaller atmospheric composition ratio [O]/[N-2] in summer leads to a smaller daytime background N-e and thus to an enhanced T-e, and the after-sunrise photochemical contributions (mainly the O+ production) are so small that partial derivative Ne/partial derivative t also tends to be smaller. These two conditions give prominence to the transport contributions. (3) The solar activity dependences of the forenoon bite-out can be explained basically in terms of the low-electron-density background. (4) The height of formation of the forenoon bite-out is also related to the sunrise effect on photoionization. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | MU-RADAR ; F-LAYER ; MODEL |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000087962100010 |
| 公开日期 | 2015-12-01 |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/8533]  |
| 专题 | 武汉物理与数学研究所_2011年以前论文发表（包括2011年） |
| 作者单位 | 1.Boston Univ, Ctr Space Phys, Boston, MA 02215 USA 2.Boston Univ, Dept Elect & Comp Syst Engn, Boston, MA 02215 USA 3.Kyoto Univ, Ctr Radio Atmospher Sci, Uji 611, Japan 4.Chinese Acad Sci, Wuhan Inst Phys & Math, Wuhan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, SR,Oliver, WL,Fukao, S,et al. A study of the forenoon ionospheric F-2 layer behavior over the middle and upper atmospheric radar[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2000,105(A7):15823-15833. |
| APA | Zhang, SR,Oliver, WL,Fukao, S,&Otsuka, Y.(2000).A study of the forenoon ionospheric F-2 layer behavior over the middle and upper atmospheric radar.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,105(A7),15823-15833. |
| MLA | Zhang, SR,et al."A study of the forenoon ionospheric F-2 layer behavior over the middle and upper atmospheric radar".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 105.A7(2000):15823-15833. |
入库方式： OAI收割
来源：武汉物理与数学研究所
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