Water vapour monitoring at the Roque de los Muchachos Observatory (1996-1998)

Details Water vapour monitoring at the Roque de los Muchachos Observatory (1996-1998) Water vapour monitoring at the Roque de los Muchachos Observatory (1996-1998)

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998newar..42..537k&link_type=abstract

New Astronomy Reviews, Volume 42, Issue 6-8, p. 537-542.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present initial results from a water-vapour monitoring campaign initiated in 1996. A certain amount of caution must still be applied to the interpretation of the water-vapour statistics as a large majority of the data have been taken in summer, or autumn. Continued monitoring is accumulating strong evidence of a seasonal effect, with typically much smaller water-vapour columns during the winter months. The data suggests that a high percentage of nights (/~39%) are acceptable for thermal infrared observing (/<3 mm of water vapour at the zenith), even during the poorest epochs of the year, while this figure increases to /~70% during the winter months. A significant percentage of the time (/~10%), independently of season, the water vapour column is below 1 mm at the zenith; such small water-vapour columns may remain stable for several days at a time.

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