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Sub-millimetre Wave Solar Observations

Abstract

A SUB-MILLIMETRE wave observation1 of the Sun, obtained in December 1967 at an altitude of 3,580 m, indicated an unexpected absorption feature in the range 7–9 cm−1, and thus confirmed an earlier unpublished result obtained as part of a study in March 1957 at the same site2. Because of the long atmospheric path during the more recent experiment, the spectral quality in the 20–30 cm−1 range was modest. In order to obtain better solar results over this range, further observations were made in April 1968 when the air mass in the observation path was smaller and comparable with that of March 1957.

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GEBBIE, H., CHAMBERLAIN, J. & BURROUGHS, W. Sub-millimetre Wave Solar Observations. Nature 220, 893–895 (1968). https://doi.org/10.1038/220893b0

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