Abstract
RECENT observations of radio noise from the upper atmosphere mainly at a frequency of 5 kc./s. have shown that it appears frequently to come from sources of limited geographical size. For example, records of the noise amplitude at places only 1,000 km. apart differ considerably in their time variations, while directional measurements of the apparent noise sources have suggested that they are sometimes as small as 500 km. in extent1–3.
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References
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ELLIS, G. Observations of Atmospheric Radio Noise. Nature 186, 229 (1960). https://doi.org/10.1038/186229a0
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DOI: https://doi.org/10.1038/186229a0
