Abstract
A RECENT study1 of the occurrence of sporadic E has shown that the percentage of the time ƒ0 E s > 5 Mc./s. exhibits a marked longitude effect, having a maximum (∼ 30 per cent) over south-east Asia and minima over South Africa (∼ 3 per cent) and the north-east part of the United States (∼ 6 per cent). That the effect is real, and not due to differences of equipment sensitivity, has been confirmed by very high-frequency forward scatter experiments over the Caribbean and the Philippines2. The suggestion was put forward that this longitude effect may depend in a complex manner on both geographical and magnetic latitudes or may be due to meteorological effects2.
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References
Smith, jun., E. K., “AGARDograph 34 Sporadic E Ionization”, 1 (NATO Advisory Group for Aeronautical Research and Development, 1958).
Smith, jun., E. K., and Finney, J. W., J. Geophys. Res., 65, 885 (1960).
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HEISLER, L., WHITEHEAD, J. Longitude Effect in Temperate Zone Sporadic E and the Earth's Magnetic Field. Nature 187, 676–677 (1960). https://doi.org/10.1038/187676a0
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DOI: https://doi.org/10.1038/187676a0
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