Caltech Submillimeter Observatory California Institute of Technology

Caltech Submillimeter Observatory


Optical Depth

Data

Because the CSO closed on September 18, 2015, only historical data are available.


Plots

Both 225 GHz and 350 μm measurements.

225 GHz measurements.

Current Previous (since 1997 January)
Month
(YYYYMM)
Month CDF
(YYYY_mMM)
Quarter CDF
(YYYY_qQ)

Custom plot


Historical Data

225 GHz measurements.

Today
since 2009 January 1:
(YYYYMMDD)
2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000
1999 1998 1997
1989-2000

Instruments

At the CSO, two tipping radiometers measure the atmospheric transparency (optical depth).