Global Measurements of Low-Frequency Radio Noise
Global Measurements of Low-Frequency Radio Noise
复制标题
低频无线电噪声的全球测量
DOI：
--
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
M. Ladd
中科院分区：
文献类型：
--
作者：
A. Fraser;P. McGill;A. Bernardi;R. Helliwell;M. Ladd
我们报告说明性的结果所获得的斯坦福大学的全球调查ELF/VLF无线电噪声（频率范围10 Hz - 32 kHz）。特别是在高纬度（极地）与低纬度的噪声测量之间的比较。虽然在世界各地观测到的自然极低频/甚低频噪声大部分是闪电产生的，但高纬度噪声往往含有磁层起源的其他成分。在我们已经检查的数据中，这种噪声主要由极性合唱组成，其集中在300 Hz-2 kHz的范围内。它在噪声统计中产生特征签名。较不频繁的宽带（极光）嘶嘶声偶尔会掩盖大部分或所有的闪电产生的噪音在极低频/甚低频范围。
We report illustrative results obtained by Stanford University’s global survey of ELF/VLF radio noise (frequencies in the range 10 Hz – 32 kHz). Particular comparison is made between the noise measurements made at high (polar) latitudes with those at lower latitudes. Although most of the natural ELF/VLF noise observed everywhere in the world is lightning-generated, the high-latitude noise often contains additional components that are of magnetospheric origin. In the data we have examined, this noise consists predominantly of polar chorus, which is concentrated in the range 300 Hz–2 kHz. It produces a characteristic signature in the noise statistics. Less frequent occurrences of broad-band (auroral) hiss can occasionally mask most or all of the lightning-generated noise in the ELF/VLF range.