Points from Foregoing Letters


    IRREGULAR. echoes of radio waves reflected from heights between 100 km. and 300 km. indicate, according to T. L. Eckersley, the presence of ionic clouds or irregularities in the ionosphere. Since the effect is noticeable both day and night, the sun cannot be responsible for this ionization, and it is suggested that the responsible agents might be small meteorites or high-speed particles from the stars.

    Rights and permissions

    Reprints and Permissions

    About this article

    Cite this article

    Points from Foregoing Letters. Nature 140, 853 (1937). https://doi.org/10.1038/140853b0

    Download citation


    By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.