Abstract
IN a recent publication, Belrose and Hewitt1 have produced evidence for a variation in collision frequency with solar activity in the lowest ionosphere (at about 60 km height). In this communication we direct attention to similar results which we have obtained for a somewhat higher altitude (about 110 km).
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References
Belrose, J. H., and Hewitt, L. W., Nature, 202, 267 (1964).
Schlapp, D. M., J. Atmos. Terr. Phys., 16, 340 (1959).
Ramana, K. V. V., and Rao, B. R., Proc. of IGY Symp., 1, New Delhi (1962).
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BEYNON, W., JONES, E. Collision Frequency in the Ionosphere and Solar Activity. Nature 203, 1159 (1964). https://doi.org/10.1038/2031159a0
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DOI: https://doi.org/10.1038/2031159a0
