Abstract
IN a recent article1 describing a geomagnetic conjugate point experiment an accurately synchronized pair of spectrograms was shown. As shown in Fig. 1 of that article a sequence of six noise bursts in the 5–6 kc./s. frequency region was observed at both Knob Lake, Canada (68° N., geomagnetic), and at Byrd Station, Antarctica (70° S., geomagnetic); but the sequence began at Knob Lake 0.8 ± 0.1 sec. before it began at Byrd.
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References
Lokken, J. E., Shand, J. A., Wright, Sir C. S., Martin, L. H., Brice, N. M., and Helliwell, R. A., Nature, 192, 319 (1961).
Smith, R. L., The Use of Nose Whistlers in the Study of the Outer Ionosphere (Stanford Electronics Laboratory, 1960).
Dowden, R. L., J. Geophys. Res., 67, 1745 (1962).
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DOWDEN, R. Very-Low-Frequency Discrete Emissions received at Conjugate Points. Nature 195, 64 (1962). https://doi.org/10.1038/195064a0
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DOI: https://doi.org/10.1038/195064a0
