A study of mid-latitude field-aligned currents

中纬度场对准电流的研究

• 批准号: 10640430
• 负责人: IYEMORI Toshihiko
• 金额: $ 2.18万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640430/
• 关键词: field-aligned current; mid-latitude; ionospheric current; magnetospheric current; MU radar; HF radar; neutral wind; Magnetic field; neutral wind; field-aligned current

1. The magnetic effects from mid-latitude field-aligned currents have been estimated from a model calculation and compared with the ground geomagnetic observations as well as the Oersted satellite observations. It has been shown by a model calculation that the field-aligned current effects strongly depend on the dip angle of geomagnetic main field just over the ionospheric altitude. From the satellite observation, the existence of a net current system which flows into the ionosphere on the day side and flows out on the night side has been confirmed.2. The existence of the mid-latitude field-aligned current has been confirmed by a statistical analysis of the DE-2 satellite magnetic observation.3. A comparison of the MU radar electric field observation and ground geomagnetic field variation suggested that the most of the ground geomagnetic perturbation come from the magnetospheric current system which include the field-aligned currents.4. From a statistical analysis of the HF radar observation, it has been found that the occurrence frequency of ionospheric irregularities has a peak distribution around the terminator on the dusk side.

1. 根据模式计算估计了中纬度场向流的磁效应，并与地面地磁观测和Oersted卫星观测进行了比较。模型计算表明，场向电流效应强烈依赖于电离层高度上方地磁场的倾角。从卫星观测来看，已经证实了在白天进入电离层，在夜晚流出的净电流系统的存在。通过对DE-2卫星磁观测数据的统计分析，证实了中纬度场向电流的存在。通过对MU雷达电场观测和地面地磁变化的比较，发现地面地磁扰动主要来自磁层电流系统，其中包括场向电流。通过对高频雷达观测数据的统计分析，发现电离层不规则现象的发生频率在黄昏侧的终点附近有一个峰值分布。

项目成果

Iyemori, T.: "Formation of storm-time ring current and the Dst field : Some recent topics"Magnetospheric Current Systems, AGV Monograph. Vol. 118 (in press). (2000)

Iyemori, T.：“风暴时环流和 Dst 场的形成：最近的一些主题”磁层流系统，AGV 专着。

Terada,T.Iyemori,M.Nose他: "Storm-time magnetic field variations observed by the FTS-VI satellite"Earth Planets Space. 50. 853-864 (1998)

Terada、T. Iyemori、M. Nose 等人：“FTS-VI 卫星观测到的风暴时间磁场变化”《地球行星空间》50. 853-864 (1998)。

Iyemori, T.: "Formation of storm-time ring current and the Dst field ; Some recent topics"Magnetospheric Current Systems, AGU Monograph. 118(印刷中). (2000)

Iyemori, T.：“风暴时环流和 Dst 场的形成；最近的一些主题”，磁层电流系统，AGU 专着 118（出版中）。

Nose,M.Itemori,M.Takeda他: "Automated detecction of Pi2 pulsations using wavelet analysis : 1.Method and an application for substorm monitoring"Earth Planets Space. 50. 773-783 (1998)

Nose, M.Itemori, M.Takeda 等人：“使用小波分析自动检测 Pi2 脉动：1. 亚暴监测方法和应用”Earth Planets Space 50. 773-783 (1998)。

Iyemori,T: "Formation of storm-time ring current and the Dstfield : Some recent topics"Magnetospheric Current Systems,AGU Monograph. (印刷中). (2000)

Iyemori, T：“风暴时环流和 Dstfield 的形成：最近的一些主题”磁层电流系统，AGU 专着（2000 年）。