National Radio Astronomy Observatory
Site Studies
Atacama Large Millimeter Array/US

225 GHz Optical Depth (t225)

Chajnantor Mauna Kea South Pole
CSO VLBA
start 1995 Apr 1997 Jan 1995 Mar 1992 Jan 1992 Mar 1992 Jan
stop 2003 Oct 2003 Oct 1996 Jun 1992 Mar 1992 Jun 1992 Dec
uptime 85% (gif, ps.gz) 76% (gif, ps.gz) 75% (gif, ps.gz)
Comparison of Zenith optical depth: gif, ps.gz
75% 0.122 0.179 0.260 0.093 0.060 0.066
50% 0.061 0.103 0.130 0.075 0.047 0.053
25% 0.037 0.064 0.075 0.061 0.039 0.043
distribution gif, ps.gz, dat gif, ps, dat gif, ps.gz, dat gif, ps.gz, dat
Comparison of optical depth at median airmass (A < 2): gif, ps.gz
Amed 1.1 1.1 1.35
75% 0.134 0.197 0.286 0.126 0.078 0.088
50% 0.067 0.113 0.143 0.105 0.063 0.070
25% 0.041 0.070 0.083 0.082 0.053 0.057
 
source ALMA/US CSO ALMA/US Chamberlin & Bally, 1994 & 1995

Chamberlin, R. A., and Bally, J., 1994, Appl. Opt. 33, 1095
Chamberlin, R. A., and Bally, J., 1995, Int. J. IR MM Waves 16, 907

Not all links are active. Formats: ascii (dat), gif, postscript (ps).


Last modified 2003 December 17
Simon Radford