Investigation of quasi-periodic fluctuations in auroral phenomena using EISCAT radar and Cluster satellite data

磁层和电离层之间的耦合是通过磁场变化及其相关电流来调节的。尽管经过了几十年的研究，但这一过程的重要部分仍不清楚。这种耦合的一个令人印象深刻的迹象是可见的极光及其在从几秒到许多分钟的时间尺度上的变化。在北斯堪的纳维亚半岛和斯瓦尔巴群岛最近改装的EISCAT(欧洲非相干散射科学协会)雷达的帮助下，可以以高时间和空间分辨率测量电子密度、电子温度、离子温度和离子漂移速度，将仔细研究极光活动期间的不同周期，看看是否可以用场线共振或其他理论来解释它们。集群卫星飞行任务和其他卫星以及地面成像磁力计链和其他地面设施提供的磁场和电场波动数据将是这项研究的重要组成部分。这里所研究的极光和极冠现象对高层大气的能量输入的影响，应该为束方案的其他项目，特别是Lühr、雅可夫斯基、雅各比和卡伦罗德的方案提供有价值的输入。

The coupling between the magnetosphere and ionosphere is mediated through magnetic field changes and their associated currents. In spite of several decades of research, important parts of this process are still not understood. An impressive sign of this coupling is the visible aurora and its variations on timescales from seconds to many minutes. With the help of the recently modernised EISCAT (European Incoherent SCATter Scientific Association) radars in north Scandinavia and Svalbard, which can measure electron density, electron temperature, ion temperature and ion drift velocity with high time and spatial resolution, various periodicities during auroral activity will be closely studied to see whether they can be explained by field-line resonances or some other theory. Magnetic and electric field fluctuation data from the Cluster satellite mission and other satellites as well as from the ground-based IMAGE magnetometer chain and other ground-based facilities will be an important part of this study. The effect of energy input to the upper atmosphere from the auroral and polar cap phenomena studied here should provide valuable input to the other projects of the bundle proposal, in particular to the proposals of Lühr, Jakowski, Jacobi and Kallenrode.