Atmospheric Opacity at 215 GHz over San Pedro Martir Sierra in Baja California

Details Atmospheric Opacity at 215 GHz over San Pedro Martir Sierra in Baja California Atmospheric Opacity at 215 GHz over San Pedro Martir Sierra in Baja California

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997rmxaa..33...59h&link_type=abstract

Revista Mexicana de Astronomia y Astrofisica, 33, p. 59- 68 (1997)

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Scientific paper

We present radiometric measurements of the zenith optical depth at 215 GHz (1.4 mm) over the Observatorio Astronómico Nacional in the Sierra San Pedro Mártir, Baja California, México. In order to perform the measurements in a continuous way, we have developed a computerized radiometer that allows unattended operation for long periods of time. Observations were carried out during 210 days in 1992. The median values of day-time and night-time zenith sky optical depth of 0.24 and 0.20 respectively were found; the total median sky optical depth at this frequency was 0.22. To compare with other observatories, we have converted the sky optical depth to the Precipitable Water Vapor; in that case the results are similar to those reported for Mauna Kea, Hawaii, and Pico Veleta, Spain, thus placing San Pedro Mártir as a promising site for astronomical observations from the infrared through the millimetric region.

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