Equatorward expansion of the westward electrojet during magnetically disturbed periods
文献类型：期刊论文
| 作者 | Ahn, BH; Chen, GX; Sun, W; Gjerloev, JW; Kamide, Y; Sigwarth, JB; Frank, LA |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 出版日期 | 2005-01-15 |
| 卷号 | 110期号:A1 |
| ISSN号 | 0148-0227 |
| DOI | 10.1029/2004JA010553 |
| 文献子类 | Article |
| 英文摘要 | [ 1] The auroral electrojet (AE) indices have widely been used in various fields of solar terrestrial physics since their introduction to the community. Recently, it has been reported that the AE indices do not, at times, properly monitor the auroral electrojets because as magnetic activity increases, they expand equatorward beyond the standard AE network, resulting in a serious underestimation of the auroral electrojet intensity. It is particularly the case during severe geomagnetic storms. To determine quantitatively the equatorial expansion of the auroral electrojets, we examined an extensive database obtained from the Alaska, International Monitor for Auroral Geomagnetic Effects ( IMAGE), and Canadian Auroral Network for the OPEN Program Unified Study chain of magnetometers. These chains of magnetometers enable us to determine the latitude where the maximum current density of the auroral electrojet flows. It is generally understood that the center of the auroral electrojet tends to migrate equatorward with an increase in magnetic activity. We note, however, that there seems to be a lower limit particularly of the westward electrojet, similar to60 in corrected geomagnetic latitude, regardless of magnetic activity levels. The relative location of the westward electrojet with respect to the global auroral image taken from the Polar satellite is also examined. Contrary to the generally accepted notion, the auroral electrojets are found to be most intense not in the region of bright auroral luminosity but slightly poleward of it in less luminous region. The current center seems to be the region where both ionospheric conductivity and electric field become significantly high. |
| WOS关键词 | AURORAL ELECTROJETS ; GEOMAGNETIC STORMS ; POLAR IONOSPHERE ; DISTRIBUTIONS ; SUBSTORMS ; INDEXES ; CHAIN ; FIELD |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000226548600001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/65448]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Ahn, BH |
| 作者单位 | 1.Kyungpook Natl Univ, Dept Earth Sci, Taegu 702701, South Korea 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100101, Peoples R China 3.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA 4.Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA 5.Nagoya Univ, Solarterr Environm Lab, Aichi 4428507, Japan 6.NASA, Goddard Space Flight Ctr, Electrodynam Branch, Greenbelt, MD 20771 USA 7.Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA |
| 推荐引用方式 GB/T 7714 | Ahn, BH,Chen, GX,Sun, W,et al. Equatorward expansion of the westward electrojet during magnetically disturbed periods[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2005,110(A1). |
| APA | Ahn, BH.,Chen, GX.,Sun, W.,Gjerloev, JW.,Kamide, Y.,...&Frank, LA.(2005).Equatorward expansion of the westward electrojet during magnetically disturbed periods.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,110(A1). |
| MLA | Ahn, BH,et al."Equatorward expansion of the westward electrojet during magnetically disturbed periods".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 110.A1(2005). |
入库方式： OAI收割
来源：地质与地球物理研究所
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