Global Penetration and Propagation Processes of Electromagnetic Disturbances from the Polar to the Equatorial Ionosphere

极地到赤道电离层电磁扰动的全球穿透和传播过程

• 批准号: 10440137
• 负责人: YUMOTO Kiyohumi
• 金额: $ 8.06万
• 依托单位: KYUSHU UNIVERSITY
• 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
• 起止时间: 1998 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10440137/
• 关键词: solar wind changes; polar disturbances; magnetospheric response; transfer process; 210 MM network; equatorial network; global behavior; international collaboration; エネルギー侵入・伝播過程

A purpose of this study is to understand a large-scale electromagnetic penetration and propagation process in the atmospheric transition region (the region from 80 to 5-600 Km in the height where neutral and charged particles are mixed in) from the polar to equatorial regions. By using the solar wind and particle data from the WIND and ISTP satellites, we clarified the relationships between the temporal and spatial scales of disturbances in the solar wind and the large-scale electromagnetic disturbances that can penetrate even into the equatorial region on the ground. Especially, in term of the composite data analysis from the satellites and ground-based observations, we can theoretically understand the electromagnetic coupling process between the polar and equatorial regions, including the solar wind, magnetosphere, ionosphere, atmosphere and conductive earth.(1) A study on a propagation of the transient response of the magnetosphereIn this study, by investigation of the characteristi … More cs of the polarization of magnetic variations on the ground due to the SI-event, we cleared that magnetic variations in the polar region associated with SC/SI events could be interpreted only by a motion of the vortex currents generated in the polar ionosphere. The motion of the ionosphere vortex current includes the information of the deformation of the magnetopause. Therefore, the present results suggest a possibility of the monitoring for the transient response of the whole magnetosphere from ground magnetic variations.(2) A study on a global propagation of the ULF pulsationsFrom analyses of magnetic data from the Circum-pan-Pacific Magnetometer Network (CPMN) stations, it can be concluded that Pi 2 magnetic pulsations observed on the ground consist of at least five components : (1) a bouncing mode of impulsive field-aligned current at the auroral latitude, (2) a substorm current wedge oscillation (3) a surface wave at the plasmapause, (4) a cavity-like oscillation in the inner magnetosphere, and (5) a transmission of the Pi 2 electric field from the nightside auroral latitude to the dayside equatorial region. The ground Pi 2 pulsations are an ensemble of these five modes, which show their own propagations (or timings) and spatial illuminations.(3) A study on the disturbance of the electric field in the ionosphereIn order to investigate the electric disturbances in the ionosphere, we installed the FM/CW radar at SASAGURI (Fukuoka City), and made steady observation of the variations of the ionosphere. As a result, we could successfully detect the temporal and spatial variations of the ionosphere due to the imposed electric field on the polar ionosphere. These observations reveal that the electric field imposed on the polar ionosphere spread event to the equatorial region almost simultaneously. Less

本研究的目的是了解从极地到赤道的大气过渡区（中性和带电粒子混合高度80至5-600公里的区域）的大范围电磁穿透和传播过程通过利用WIND和ISTP卫星的太阳风和粒子数据，我们阐明了太阳风扰动的时空尺度与可穿透甚至穿透的大尺度电磁扰动之间的关系。特别是通过卫星和地面观测的综合数据分析，我们可以从理论上了解极地和赤道地区之间的电磁耦合过程，包括太阳风、磁层、电离层、 (1) 磁层瞬态响应传播的研究在本研究中，通过研究由于地表磁场变化引起的地面磁变化的极化特性。 SI-事件，我们明确了与 SC/SI 事件相关的极地磁场变化只能通过极地电离层中产生的涡流的运动来解释。电离层涡流的运动包括极地电离层的变形信息。因此，目前的结果表明了从地面磁变化监测整个磁层瞬态响应的可能性。(2) ULF脉动全球传播的研究来自磁数据的分析。环泛太平洋磁力计网络（CPMN）站，可以得出结论，地面上观测到的 Pi 2 磁脉动至少由五个组成部分组成：（1）极光纬度脉冲场对准电流的弹跳模式， (2) 亚暴流楔形振荡 (3) 等离子层顶的表面波，(4) 内磁层中的空腔振荡，以及 (5) Pi 的传输2 从夜间极光纬度到白天赤道区域的电场 地面 Pi 2 脉动是这五种模式的集合，它们显示出它们自己的传播（或时间）和空间照明。（3）对地表扰动的研究。电离层电场为了调查电离层的电扰动，我们在SASAGURI（福冈市）安装了FM/CW雷达，对电离层的电扰动进行了稳定的观测。结果，我们可以成功地探测到由于极地电离层上施加的电场而导致的电离层的时间和空间变化。这些观测表明，施加在极地电离层上的电场几乎同时向赤道区域传播。较少的

项目成果

Higuchi, T., S, -I.Ohtani, T.Uozumi, K.Yumoto: "Pi 2 onset time determination with information criterion"J.Geophys.Res.. 107(in press). (2002)

Higuchi, T., S, -I.Ohtani, T.Uozumi, K.Yumoto：“用信息标准确定 Pi 2 起始时间”J.Geophys.Res.. 107（出版中）。

Akinaga, Y.M.Hayakawa, J.Y.Liu, K.Yumoto, K.Hattori: "A precursory ULF signature for Chi-Chi earthquake in Taiwan"Natural Hazard and Earth System Sciences. (in press). (2001)

Akinaga、Y.M.Hayakawa、J.Y.Liu、K.Yumoto、K.Hattori：“台湾 Chi-Chi 地震的前兆 ULF 特征”自然灾害与地球系统科学。

Yumoto, K., the CPMN Group: "Characteristics of Pi 2 magnetic pulsations observed at the CPMN stations : A review of the STEP results"Earth Planets Space. 53. 981-992 (2001)

Yumoto, K.，CPMN 小组：“在 CPMN 站观测到的 Pi 2 磁脉动的特征：STEP 结果的回顾”地球行星空间。

Angelopoulos, V., J.A.Chapman, F.S.Mozer, J.D.Scudder, C.T.Russell, K.Tsuruda, T.Mukai, T.J.Hughes, K.Yumoto: "Plasma sheet electromagnetic power generation and its dissipation along auroral field lines"J.Geophys.Res.. 106(in press). (2002)

Angelopoulos, V.、J.A.Chapman、F.S.Mozer、J.D.Scudder、C.T.Russell、K.Tsuruda、T.Mukai、T.J.Hughes、K.Yumoto：“等离子体片电磁发电及其沿极光场线的耗散”J.Geophys。

Chi, P.J., C.T.Russell, J.Raeder, E.Zesta, K.Yumoto, H.Kawano, K.Kitamura, S.M.Petrinec, V.Angelopoulos, G.Le, M.B.Moldwin: "Propagation of the preliminary reverse impulse of sudden commencements to low latitudes"J. Geophys. Res.. 106,A9. 18,857-18,864 (2

Chi, P.J., C.T.Russell, J.Raeder, E.Zesta, K.Yumoto, H.Kawano, K.Kitamura, S.M.Petrinec, V.Angelopoulos, G.Le, M.B.Moldwin：“突然的初步反向脉冲的传播