Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.269..676m&link_type=abstract
Nature, Volume 269, Issue 5630, pp. 676-677 (1977).
Astronomy and Astrophysics
Astronomy
8
Scientific paper
CONSIDERABLE attention is being given to the construction of new telescopes which will extend ground-based astronomical observations to millimetre and sub-millimetre wavelengths, and so it is essential to have a better understanding of atmospheric absorption at these wavelengths. We report here measurements made from the summit of Mauna Kea in Hawaii of the absorption of radiation coming through the atmosphere in slant paths from the sun. These have extended previous knowledge of absorption at this site1,2 to lower frequencies and have confirmed that a little understood phenomenon which we call anomalous absorption can greatly reduce atmospheric transparency at some millimetre wavelengths theoretically predicted to be good windows. To compare our measurements with theoretical predictions, particular attention was paid to determinations of atmospheric water content in the same path from the sun. A complete absorption band near 1.4 µm was scanned, therefore, using a monochromator and values of precipitable water were derived by well known formulae3.
Bohlander R. A.
Gebbie H. A.
Macrae W. R.
Moffat P. H.
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