Propagation analysis of plasmaspheric hiss using Polar PWI measurements
Propagation analysis of plasmaspheric hiss using Polar PWI measurements
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DOI：
10.1029/2000gl012239
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发表时间：
2001-03
影响因子：
5.2
通讯作者：
O. Santolík;M. Parrot;L. R. O. Storey;J. S. Pickett;D. Gurnett
中科院分区：
文献类型：
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作者：
O. Santolík;M. Parrot;L. R. O. Storey;J. S. Pickett;D. Gurnett
我们分析了极地等离子体波仪器在赤道等离子体层高海拔采集的高速波形数据，以研究在100赫兹到几千赫兹频率范围内的等离子体层嘶嘶声。这些辐射几乎在等离子体层中随处可见，它们的来源仍然存在争议。我们对几个例子的分析表明，大多数波的传播或多或少平行于地球磁场，但有时也有少数波以其法线在Gendrin角附近倾斜传播。在地磁赤道附近发现了放大的证据。结果表明，与高能电子发生回旋共振相互作用的经典机制放大了法线与磁场平行和反平行的波。
We have analyzed high‐rate waveform data, taken by the POLAR Plasma Wave Instrument at high altitudes in the equatorial plasmasphere, to study plasmaspheric hiss in the range of frequencies between 100 Hz and several kHz. These emissions are found almost everywhere in the plasmasphere, and their origin is still controversial. Our analysis of several cases shows that most of the waves were propagating more or less parallel to the Earth's magnetic field, but sometimes a few of them were propagating obliquely with their normals near the Gendrin angle. Evidence of amplification was found near the geomagnetic equator. The results suggest that waves with normals both parallel and anti‐parallel to the magnetic field were being amplified by the classical mechanism that involves gyroresonant interaction with energetic electrons.