Summary
The correlation between the sunspot cycle and the sporadicE-layer ionization is investigated at middle latitudes. Higher mean values off 0Es occur generally with higher sunspot numbers. Some evidence for a phase-shift between long term time-variation in sunspot numbers andf 0Es is obtained. The solar cycle variation ofEs is somewhat larger over the Far East. Regarding the behaviour of the time-development ofEs events in diurnal variation, an interpretation is proposed.
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References
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Bossolasco, M., Elena, A. SporadicE-layer ionization and sunspot cycle. Geofisica Pura e Applicata 56, 142–149 (1963). https://doi.org/10.1007/BF01993338
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DOI: https://doi.org/10.1007/BF01993338