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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Characteristics of modulating VLF hiss observed at Indian Antarctic Station, Maitri (L = 4.5)
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Characteristics of modulating VLF hiss observed at Indian Antarctic Station, Maitri (L = 4.5)

机译：在印度南部马特里（L = 4.5）观察到的调制VLF嘶嘶声的特征

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摘要

Very low frequency (VLF) hiss emissions were observed for the first time at the Indian Antarctic Station, Maitri (geographic lat. 70deg 46minS, long. 11deg 50minE, geomagnetic lat. 66deg .03minS, long. 53deg .21minE) with the modulating intensity variations. Various spectrograms of modulating VLF hiss emissions clearly show band limited spectra regularly modulating its intensity with almost equal period of the order of few seconds in the frequency range of 9–12.8 kHz. To explain these modulating characteristics of VLF hiss, we propose that the hiss emissions are generated through Doppler-shifted cyclotron interactions near the geomagnetic equator and propagate towards the Earth in the whistlermode. Further, the micropulsations propagating along thegeomagnetic field lines could modulate the growth rate of the wave. The growth rates of the waves are also computed.
机译：在印度南极Maitri站首次观测到极低频（VLF）的嘶嘶声（地理纬度为70deg 46minS，长为11deg 50minE，地磁纬度为66deg.03minS，长53deg.21minE），且具有调制强度变化。调制VLF嘶嘶声发射的各种频谱图清楚地表明，在9–12.8 kHz频率范围内，带宽有限的频谱以几乎相等的几秒钟的周期规则地调制其强度。为了解释甚低频嘶嘶声的这些调制特性，我们提出嘶嘶声发射是通过地磁赤道附近的多普勒频移回旋加速器相互作用产生的，并以啸叫模式向地球传播。此外，沿着地磁场线传播的微脉冲可以调节波的增长率。还可以计算波浪的增长率。

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