Abstract
ON February 10, 1943, the Prague Observatory reported strong, brilliant sunspot eruptions. On the same day, the Chalmers Ionospheric Observatory registered a radio fade-out between 10.43 and 10.48 local time as shown by the recording. The frequency used was 2.93 Mp./s. It is interesting to note that an oblique incidence double pulse (from a distant sender) was recorded at the same time, as shown by the lowest pattern. During the fade-out, starting and ending before and after it, the recorded double pulse was apparently reflected from the region of abnormal ionization below the regularly reflecting layer. Finally, it should be remarked that the magnetograms showed no conspicuous change at the time of the fade-out.
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RYDBECK, O. Radio Fade-Out in Sweden. Nature 151, 700 (1943). https://doi.org/10.1038/151700b0
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DOI: https://doi.org/10.1038/151700b0
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