AURORAL DYNAMICS AND PARTICLE PROCESSES IN THE MAGNETOSPHERE.

磁层中的极光动力学和粒子过程。

基本信息

批准号：
62460049
负责人：
OGUTI Takasi
金额：
$ 3.97万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

Two dimensional structures and dynamics of auroral images were examined to study magentosphere-ionosphere link based on all-sky video data acquired at 9 sites during Global Aurora Dynamics Campaign (Dec. 1985 - Jan. 1986).1. Large scale evolutions of auroras in a global extent of 9 key stations were studied based on all-sky TV record, and the northward protrusions are found to develop and decay one after another along the poleward front of an expansion aurora. Distribution of the ground magnetic field deflections concurrent with the auroral deformations indicates that the regions of the westward electrojet associated with the auroral protrusions are spatially limited. The localized signature of the jet-current have been related to the fact found in space that sudden changes in magnetic field occur at synchronous orbit when an auroral protrusion develops in the vicinity of the conjugate point determined by field-line tracing in a model magnetic field.2. Close relationships have been fou … More nd bewteen Pc5 magnetic pulsations and concurrent periodic appearance and movement of auroral structures during magnetic substorm. Characteristics of the pulsations were examined as the effects of electric field and electric conductivity changes in the ionosphere, which were estimated from oscillations in auroral drift motion and in auroral luminosity, respectively. Neither of simple models which include only electric field modulation or only conductivity modulation could not explain the phase relation bewteen the Pc5 pulsations and auroral pulsations during substorm.3. Near the dayside cusp, small auroral expansions continually occur with a sequence of 10 minutes or so. Bursts of magnetic pulsations in the frequency range of 0.3-0.8 Hz and impulsive magnetic variations of several minute duration were often associated with poleward motions of short-lived auroral expansions. The transient poleward motions occurred coincidentally with the equatorward shift of auroral oval in the afternoon region.4. Signatures indicating localized source region of Pc 1 micropulsations were confirmed in high density UIF network data on the ground, both in magnetic field and in proton precipitation data of low altitude satellite, and in a theoretical model. Less

检查了极光图像的二维结构和动力学，以研究基于在全球Aurora动力学运动期间在9个站点获得的全型视频数据（1985年12月至1986年1月 - 1986年1月）.1。基于全天空电视记录，在全球9个关键站的全球范围内，极光的大规模演变是研究的，并且发现北向蛋白质会沿膨胀极光的极端前部发展和衰减。与极光变形并发的地面磁场偏转的分布表明，与极光蛋白相关的向西电泽的区域在空间上受到限制。射流电流的局部特征与在空间中发现的事实有关，该事实突然在同步轨道的磁场上发生了变化，当时是通过模型磁场中的场线跟踪确定的共轭点附近的耳蛋白发育。2。密切的关系已经得到了……更多的PC5 PC5磁性脉动以及磁性物质过程中极光结构的同时周期性外观和运动。脉动的特征被检查为电离层电场和电导率变化的影响，这是从极光漂移运动中的振荡和极光发光度中估计的。仅包括电场调制或仅电导率调制的两个简单模型都无法解释pC5脉动和近气脉冲脉冲的相位关系。3。在几天的尖尖，小的极光膨胀连续出现，序列为10分钟左右。在0.3-0.8 Hz的频率范围内的磁脉冲爆发和持续时间的冲动磁变化通常与短寿命的极光膨胀的极点运动有关。瞬时极端运动是在下午区域的极光椭圆形的等效转移的偶然发生的。4。在地面上的高密度UIF网络数据中，在磁场和低海拔卫星的质子沉淀数据和理论模型中，在地面上的高密度UIF网络数据和理论模型中确认了表明PC 1微量的局部源区域的特征。较少的