Abstract
POLARISATION electric fields produced in the dynamo region should, theoretically, have a considerable effect on the distribution and energy of magnetospheric particles, but none has been found previously1–3. Here we show that the Dst index calculated by Sugiura and Poros4 shows a semidiurnal variation, which we attribute to the effect of tides (caused by the Moon) in the dynamo region, thus verifying the theory.
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References
Maeda, H., J. atmos. terr. Phys., 26, 1133–1138 (1964).
DeWitt, R. M., and Akasofu, S.-I., Planet. Space Sci., 13, 729–736 (1965).
Frank, L. A., Van Allen, J. A., and Craven, J. D., J. Geophys. Res., 69, 3155–3167 (1964).
Sugiura, M., and Poros, D. N., NASA Reports, X–645–71–278 (1971) and (1973).
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KAMEI, T., MAEDA, H. Lunar effect in the quiet-time Dst index. Nature 259, 644–645 (1976). https://doi.org/10.1038/259644a0
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DOI: https://doi.org/10.1038/259644a0
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