Abstract
IT has been shown by Allcock1 and Pope2 that the diurnal occurrence of very-low-frequency emissions depends on geomagnetic latitude up to about 60°, with the maximum occurrence, measured in local time, increasing linearly with latitude. At higher latitudes, a band of noise (the ‘low emission band’), centred typically about 750 c/s and a few hundred c/s wide, is observed3 which does not appear to continue the pattern of lower latitude emissions4. However, a consistent picture is obtained if the time of peak occurrence is measured in a new coordinate system, apparently related to auroral occurrence and called ‘local mean auroral time’.
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References
Allcock, G. McK., Austral. J. Phys., 10, 286 (1957).
Pope, J. H., Nature, 185, 87 (1960).
Aarons, J., Gustafsson, G., and Egeland, A., Nature, 185, 148 (1960).
Ungstrup, Eigil, Roy. Tech. Univ. Denmark, Rep. No. 12 (Copenhagen).
Vegard, L., Phil. Mag., 23, 211 (1912).
Chamberlain, J. W., Physics of the Aurora and Airglow, 67 (Academic Press, New York and London, 1961).
Schneider, Otto, Contribucion del Instituto Antarctico Argentino, No. 55 (Buenos Aires, 1961).
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BRICE, N., UNGSTRUT, E. Use of ‘local Mean Auroral Time’ for Very-Low-Frequency Emissions. Nature 198, 874 (1963). https://doi.org/10.1038/198874a0
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DOI: https://doi.org/10.1038/198874a0
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