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首页> 外文期刊>Earth, planets and space: EPS >Dayside magnetopause Pc 3 and Pc 5 ULF waves observed by the GEOTAIL Satellite
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Dayside magnetopause Pc 3 and Pc 5 ULF waves observed by the GEOTAIL Satellite

机译：GEOTAIL卫星观测到的日间磁更年期Pc 3和Pc 5 ULF波

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摘要

This study is intended to reveal the oscillation and propagation characteristics of ULF waves observed near the dayside magnetopause. A comparative study of such ULF wave phenomena is made by using the data obtained from the successive skimmings of the dayside magnetopause by the GEOTAIL Satellite performed on three successive days of 9, 18, and 27 December 1994. The instrumentations of GEOTAIL are good for such a task, since the satellite simultaneously measured the magnetic and electric fields, and low energy plasma data. Based the observed data, we studied the dynamic spectral characteristics of both magnetic and electric fields. The results revealed that the dominant ULF waves appearing in the dynamic spectra were Pc 3 and Pc 5 oscillations. The Pc 3 oscillations were observed during a limited local time around noon without an extension to the dawn and dusk flanks, and dominantly appeared at a frequency of approx 25 mHz in the azimuthal component of the magnetic field. This frequency component showed clear resonant oscillation characteristics. In addition to this. A fast mode earthward propagation characteristic was also recognized. The Poynting flux of the Pc 3 signals showed that the energy flux was about 10 nJ/m~2s on average, the strongest being along the magnetic field line. Pc 5 oscillations showed another dominant spectral power which appeared in the radial component of the electric field, suggesting that the resonance oscillations were well established. However, the Pc 5 oscillations in the subsolar region did not show any earthward propagation characteristics.
机译：这项研究的目的是揭示在日间磁更年期附近观察到的ULF波的振荡和传播特性。利用从1994年12月9日，18日和27日连续三天对GEOTAIL卫星进行的日间磁绝经的连续撇取获得的数据，对这种ULF波现象进行了比较研究。这是一项任务，因为卫星同时测量了磁场和电场以及低能等离子体数据。根据观察到的数据，我们研究了磁场和电场的动态光谱特性。结果表明，动态谱中出现的主要ULF波为Pc 3和Pc 5振荡。在中午前后有限的局部时间内观察到了Pc 3振荡，而没有延伸到黎明和黄昏的侧面，并且主要在磁场的方位分量中以大约25 mHz的频率出现。该频率分量显示出清晰的谐振特性。除此之外。还认识到快速模式向地球传播的特性。 Pc 3信号的Poynting通量表明能量通量平均约为10 nJ / m〜2s，最强的是沿着磁场线。 Pc 5振荡显示出另一个主要的频谱功率，该功率出现在电场的径向分量中，表明共振振荡已得到很好的建立。但是，次太阳区的Pc 5振荡没有显示出任何向地球传播的特征。

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