Quantitative studies of the Earth's ionospheric-origin ions on the outflow/supply to the magnetosphere and the acceleration/heating and transpotation processes
Quantitative studies of the Earth's ionospheric-origin ions on the outflow/supply to the magnetosphere and the acceleration/heating and transpotation processes
批准号:
10440138
负责人:
HIRAHARA Masafumi
金额:
$3.58万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (B)
财政年份:
1998
资助国家:
日本
项目状态:
已结题
起止时间:
1998 至 2000
中文摘要
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英文摘要
First of all, we investigated the properties of plasma waves which are expected to cause the ionospheric ion acceleration/heating on the basis of the Akebono satellite observations. The relationships of these waves to the outflowing ion conics were statistically surveyed especially from aspects of their occurrence frequencies of events sorted into altitudes, pitch angles, magnetic latitude, and local time. Our detailed wave analyzes presented two types of wave forms, namely, low-frequency random noise-type wave and sporadic spike-type wave, two of which superimpose each other. The importance of photoelectron effects on polar wind events is also become clear according to the Akebono data analyzes. On one hand, the recent results of multi-satellite observation data verified the dependence of the conics events on the interplanetary magnetic field. We also analyzed the Geotail data for estimate of the outflow fluxes in the magnetosphere of the ionospheric origin ions after their escape from the polar ionosphere. It should be noted that we take all routes of the ionospheric ions after the ejection from the terrestrial atmosphere into account in order to calculate correct amount of the terrestrial-origin ions in the magnetosphere. The recent observation data from EISCAT were used for exploring the ionospheric ion heating phenomena at low altitutes where at is expected that the ion outflows are triggered. It is likely that the anisotropic pitch angle distribution plays an crucial role for ion heating/acceleration as a cause of the ion outflow events observed at high altitudes.
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Buchert,S.C.et al.: "Naturally enhanced ion-acoustic lines seen with the EISCAT Svalbard radar"Adv.Space Res. 23. 1699-1704 (1999)
Buchert,S.C.等人:“使用 EISCAT 斯瓦尔巴雷达看到的自然增强的离子声线”Adv.Space Res。
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W.Miyake et al.: "Interplanetary magnetic field control of dayside ion conics"J. Geophys. Res.. 105. 23,339-23,344 (2000)
W.Miyake等:“日侧离子圆锥的行星际磁场控制”J。
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K Seki et al.: "Cold flowing O^+ beams in the lobe/mantle at Geotail : Does FAST observe the source?"J. Geophys. Res.. 105. 15,931-15,944 (2000)
K Seki 等人:“Geotail 的叶/地幔中冷流动的 O^ 光束:FAST 是否观察到源?”J.
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W Miyake et al.: "Modeling of occurrence frequencies of ion conics as a function of altitude and conic angle"Ann. Geophysicae. 18. 47-55 (2000)
W Miyake 等人:“将离子圆锥曲线的出现频率作为高度和圆锥角的函数进行建模”Ann。
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共 31 条
Space Plasma Acceleration in Radiation Belt, Shock, and Polar Magnetosphere by Wave-Particle Interaction and Electro-Magnetic Fields
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批准号:21244075
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项目类别:Grant-in-Aid for Scientific Research (A)
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资助金额:$28.45万
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财政年份:2009
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负责人:HIRAHARA Masafumi
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依托单位:
Multi-dimensional Simultaneous Observations of the Geospace-Ionosphere Phenomena using Low-Altitude Polar Satellites and Ground-Based Facilities
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批准号:19403011
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项目类别:Grant-in-Aid for Scientific Research (B)
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资助金额:$10.07万
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财政年份:2007
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负责人:HIRAHARA Masafumi
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依托单位:
Developmental Research for Establishing Measurement Techniques of Multi-Composition Space Plasma over a Wide Energy Range and Elucidating the Space Plasma Interaction in Geospace
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批准号:16204037
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项目类别:Grant-in-Aid for Scientific Research (A)
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资助金额:$30.2万
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财政年份:2004
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负责人:HIRAHARA Masafumi
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依托单位: