Abstract
WE question the suggestion of Braude et al.1 that apparent variability of the decametric radio emission from Cas A and 3C 84 is intrinsic to the sources. Their suggestion, if correct, would have important consequences for theories of radio sources, but we argue that their reasons for discounting ionospheric phenomena as the cause of the variations may be insufficient. Furthermore, our own observations of 3C 84 at 10.03 MHz show no evidence of variability greater than that attributable to residual ionospheric effects.
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References
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BRIDLE, A., CASWELL, J. Decametric Variability of Cas A and 3C 84. Nature 225, 356–357 (1970). https://doi.org/10.1038/225356a0
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DOI: https://doi.org/10.1038/225356a0
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