Abstract
WE wish to report a number of measurements of the radiation from the Sun in a wavelength range centred at 1.2 mm which show a large amount of solar activity. Since the discovery by Newstead (unpublished work) of an active region at 1.2 mm we have made a more detailed localized study of the solar disk. This has shown measurable activity on a considerable fraction of the days on which observations have been made, and may indicate a long term increase of solar activity at these wavelengths perhaps associated with the increase of the sunspot cycle.
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CLARK, C., PARK, W. Localized Solar Enhancement at 1.2 mm Wavelength. Nature 219, 922–924 (1968). https://doi.org/10.1038/219922a0
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DOI: https://doi.org/10.1038/219922a0
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