Abstract
EXTENDING the theoretical work of Eckersley1, and combining it with extensive experimental observations, Storey deduced that whistlers result from the energy of very low frequency radiated by lightning flashes, propagated up to great heights along the flux of the Earth's magnetic field and down again to the ground at the geomagnetically symmetrical place in the opposite hemisphere, taking a second or two to make this very long trip. The lower frequencies travel more slowly than the high, so that the original impulse is spread out into a swish or whistler of descending pitch when it is received2.
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References
Eckersley, T. L., Marconi Rev., No. 31, 5 (1931).
Storey, L. R. O., Phil. Trans. Roy. Soc., B, 246, 113 (1953).
Morgan, M. G., and Allcock, G. McK., Nature, 177, 30 (1956). Helliwell, R. A., and Gehrels, E., Proc. Inst. Rad. Eng., 46, 785 (1958).
Helliwell, R. A., and others, J. Geophys. Res., 61, 139 (1956).
Ellis, G. R., J. Atmos. and Terres. Phys., 8, 338 (1956).
Morgan, M. G., and Dinger, H. E., Nature, 177, 29 (1956).
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MORGAN, M. Correlation of Whistlers and Lightning Flashes by Direct Aural and Visual Observation. Nature 182, 332–333 (1958). https://doi.org/10.1038/182332a0
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DOI: https://doi.org/10.1038/182332a0
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