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Observation of Million Degree Thermal Radiation from the Sun at a Wavelength of 1.5 Metres

Nature volume 158, pages 633634 (02 November 1946) | Download Citation



IN the preceding communication, Martyn has shown X that at wavelengths of a few metres, thermal radiation corresponding to a temperature of about & million degrees should be radiated from the sun. The detection of this radiation is complicated by the presence of a further source, which is highly variable and is associated in some way with sunspots. This sojmje can, bn occasion, yield radiation up to 100 times the expected thermal intensity. If we confine ourselves to intensity measurements, it would in fact be detectable only if the intensity due to the variable source, not infrequently fell below that of the thermal one.

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  1. Radiophysics Laboratory, Chippendale, N.S.W.

    • J. L. PAWSEY


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