Estimating the capture and loss of cold plasma from ionospheric outflow
文献类型：期刊论文
| 作者 | Haaland, S.; Eriksson, A.; Engwall, E.; Lybekk, B.; Nilsson, H.; Pedersen, A.; Svenes, K.; Andre, M.; Foerster, M.; Li, K. |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 出版日期 | 2012 |
| 卷号 | 117页码:A07311 |
| ISSN号 | 0148-0227 |
| 通讯作者 | Haaland, S (reprint author), Univ Bergen, Dept Phys & Technol, Allegaten 55, N-5007 Bergen, Norway. |
| 中文摘要 | An important source of magnetospheric plasma is cold plasma from the terrestrial ionosphere. Low energy ions travel along the magnetic field lines and enter the magnetospheric lobes where they are convected toward the tail plasma sheet. Recent observations indicate that the field aligned ion outflow velocity is sometimes much higher than the convection toward the central plasma sheet. A substantial amount of plasma therefore escapes downtail without ever reaching the central plasma sheet. In this work, we use Cluster measurements of cold plasma outflow and lobe convection velocities combined with models of the magnetic field in an attempt to determine the fate of the outflowing ions and to quantify the amount of plasma lost downtail. The results show that both the circulation of plasma and the direct tailward escape of ions varies significantly with magnetospheric conditions. For strong solar wind driving with a southward interplanetary magnetic field, also typically associated with high geomagnetic activity, most of the outflowing plasma is convected to the plasma sheet and recirculated. For periods with northward interplanetary magnetic field, the convection is nearly stagnant, whereas the outflow, although limited, still persists. The dominant part of the outflowing ions escape downtail and are directly lost into the solar wind under such conditions. |
| 英文摘要 | An important source of magnetospheric plasma is cold plasma from the terrestrial ionosphere. Low energy ions travel along the magnetic field lines and enter the magnetospheric lobes where they are convected toward the tail plasma sheet. Recent observations indicate that the field aligned ion outflow velocity is sometimes much higher than the convection toward the central plasma sheet. A substantial amount of plasma therefore escapes downtail without ever reaching the central plasma sheet. In this work, we use Cluster measurements of cold plasma outflow and lobe convection velocities combined with models of the magnetic field in an attempt to determine the fate of the outflowing ions and to quantify the amount of plasma lost downtail. The results show that both the circulation of plasma and the direct tailward escape of ions varies significantly with magnetospheric conditions. For strong solar wind driving with a southward interplanetary magnetic field, also typically associated with high geomagnetic activity, most of the outflowing plasma is convected to the plasma sheet and recirculated. For periods with northward interplanetary magnetic field, the convection is nearly stagnant, whereas the outflow, although limited, still persists. The dominant part of the outflowing ions escape downtail and are directly lost into the solar wind under such conditions. |
| 学科主题 | 空间物理 |
| 收录类别 | SCI |
| 资助信息 | United Kingdom Science and Technology Facilities Council (STFC) |
| 语种 | 英语 |
| 公开日期 | 2014-12-15 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/3269]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Haaland, S.,Eriksson, A.,Engwall, E.,et al. Estimating the capture and loss of cold plasma from ionospheric outflow[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2012,117:A07311. |
| APA | Haaland, S..,Eriksson, A..,Engwall, E..,Lybekk, B..,Nilsson, H..,...&Ostgaard, N..(2012).Estimating the capture and loss of cold plasma from ionospheric outflow.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,117,A07311. |
| MLA | Haaland, S.,et al."Estimating the capture and loss of cold plasma from ionospheric outflow".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 117(2012):A07311. |
入库方式： OAI收割
来源：国家空间科学中心
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