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Mapping the whole of auroral regions onto the magnetosphere

将整个极光区域映射到磁层上

基本信息

批准号：
16540409
负责人：
SHIRAI Hisato
金额：
$ 1.34万
依托单位：
Ichinoseki National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540409/
关键词：
aurora magnetosphere mapping modeling Earth environment plasma sheet Akebono Geotail 地球

项目摘要

The goal of this project is to present a mapping method which enables us to map the whole of auroral regions onto the magnetosphere. Usual methods of mapping utilize field-line models that are the average of the magnetic field observed in the magnetosphere. This method is not very reliable in mapping high-latitude auroral regions to the magnetotail (>10 Re), since the magnetic field in the magnetotail includes large fluctuations. In this study, we proposed another method for mapping, in which any field-line models are not used. In our method, particle structures are utilized as tracers for mapping auroral regions to the magnetosphere.(1)In 2004, we analyzed the particle data obtained by the Akebono satellite in the auroral regions and by the Geotail satellite in the magnetotail. We found two kinds of particle structures. These structures were identified both in the auroral and magnetospheric regions. It was expected that they can be utilized as tracers for mapping (Paper 1 and 2).(2)On the basis of these results, we proposed a new method of mapping (field-line tracing) in which we utilize the particle structures as tracers. It was shown (in Paper 3 and 4) that this method is applicable also to the case of high-latitude aurora mapping.Thus, we have succeeded in presenting a new method for mapping. However, our method is successful only in mapping auroral regions observed under the geomagnetically quiet condition. More detailed analysis of particle data obtained under active conditions is planned for completing our model. This is the next step in our study.

该项目的目标是提出一种映射方法，使我们能够将整个极光区映射到磁层上。制图的一般方法利用磁力线模型，即在磁层中观测到的磁场的平均值。这种方法在绘制高纬度极光区到磁尾（>10 Re）的地图时并不十分可靠，因为磁尾的磁场波动很大。在这项研究中，我们提出了另一种映射方法，其中不使用任何场线模型。在我们的方法中，粒子结构被用来作为示踪剂映射极光区的磁层。(1)In 2004年，我们分析了Akebono卫星在极光区和Geotail卫星在磁尾区获得的粒子数据。我们发现了两种粒子结构。在极光区和磁层区都发现了这些结构。预计它们可以用作绘图的示踪剂（论文1和2）。(2)On在这些结果的基础上，我们提出了一种新的映射方法（场线追踪），其中我们利用粒子结构作为示踪剂。文3和文4表明，这种方法也适用于高纬度极光制图的情况，从而成功地提出了一种新的制图方法。然而，我们的方法是成功的，只有在映射极光区观测地磁安静的条件下。计划对在活跃条件下获得的粒子数据进行更详细的分析，以完成我们的模型。这是我们研究的下一步。