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Estimating the capture and loss of cold plasma from ionospheric outflow
Haaland, S.; Eriksson, A.; Engwall, E.; Lybekk, B.; Nilsson, H.; Pedersen, A.; Svenes, K.; Andre, M.; Foerster, M.; Li, K.; Johnsen, C.; Ostgaard, N.; Haaland, S (reprint author), Univ Bergen, Dept Phys & Technol, Allegaten 55, N-5007 Bergen, Norway.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2012
Volume117Pages:A07311
ISSN0148-0227
Language英语
AbstractAn 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.; 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.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3269
Collection空间科学部
Corresponding AuthorHaaland, S (reprint author), Univ Bergen, Dept Phys & Technol, Allegaten 55, N-5007 Bergen, Norway.
Recommended Citation
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..,...&Haaland, S .(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.
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