Quantitative analysis of the relationship between polar ionospheric currents and auroral electrojet indices
文献类型：期刊论文
| 作者 | Xu, WY; Chen, GX |
| 刊名 | SCIENCE IN CHINA SERIES D-EARTH SCIENCES
 |
| 出版日期 | 2005-03-01 |
| 卷号 | 48期号:3页码:376-383 |
| 关键词 | Polar Current System Auroral Electrojet Auroral Electrojet Indices Magnetic Disturbance |
| ISSN号 | 1006-9313 |
| DOI | 10.1360/03yd0036 |
| 文献子类 | Article |
| 英文摘要 | The ionospheric currents in the polar region are caused mainly by field-aligned currents. The quiet polar current system consists of a pair of current vertices at dawn and dusk. When substorm occurs, however, intense magnetic disturbances are generated by enhanced polar currents, especially the westward electrojet of a millions Amperes in the auroral oval. The intensity of the auroral electrojet is commonly described by the auroral electrojet indices AL, AU, AE and AO. In this paper the relationship between the polar current system and the auroral electrojet indices is quantitatively studied by means of polar current functions obtained from the data recorded at 71 magnetic stations in the northern polar region during the International Magnetospheric Study (IMS). Fairly well linear correlation of AL (or AU) with AE index has been found, indicating that AE index multiplied by a proper factor can approximately substitute AL and AU indices. The total polar current, J(T), and the strengths of the dawn and dusk current vortices, J(T1) and J(T2), can be characterized by AE index, an increment of 1 nT in AE index corresponding to 1000A in J(T). A fairly well direct proportion is found between AE and the maximal westward current density, an increment of 1 nT in AE corresponding to 1 A/km of the maximal westward current density at magnetic midnight. The latitudinal profiles of the current density are similar for different local time in night sector. The maximal density of the westward electrojet usually occurs at geomagnetic latitude 65 degrees-70 degrees around midnight, as for the eastward electrojet, it is around 80 degrees. The analysis shows that for 5-mimute mean values, the saturation values of AE and AL are 700 nT and -500 nT, respectively. Accordingly, a caution should be taken when the indices greater than the saturation values would be used for studying magnetospheric or ionospheric processes. |
| WOS关键词 | FIELD-ALIGNED CURRENTS ; SUBSTORMS ; SIMULATION ; STORMS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000228767700009 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/65522]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Xu, WY |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, WY,Chen, GX. Quantitative analysis of the relationship between polar ionospheric currents and auroral electrojet indices[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2005,48(3):376-383. |
| APA | Xu, WY,&Chen, GX.(2005).Quantitative analysis of the relationship between polar ionospheric currents and auroral electrojet indices.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,48(3),376-383. |
| MLA | Xu, WY,et al."Quantitative analysis of the relationship between polar ionospheric currents and auroral electrojet indices".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 48.3(2005):376-383. |
入库方式： OAI收割
来源：地质与地球物理研究所
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