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IERS Message No. 198                                   November 03, 2011
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Note to IERS C04 and Bulletin A users


According to the IERS Directing Board resolution (DB52), and starting on
1 December 2011, the EOP C04 series will be delivered with a 30-day
latency. In other words, only final definitive values will be included
in it. 

Users needing a long-term continuous series extending up to a recent
date (including rapid solution over the most recent 30 days) will have
two solutions:

1) Getting the C04 solution extending until the date 30 days back
   and available at
   ftp://hpiers.obspm.fr/iers/eop/eopc04/eopc04_IAU2000.YY
   where YY is current two digit year 
	
   and concatenate it with the Rapid solution issued from the Rapid
   Service/Prediction Center available at:
   ftp://maia.usno.navy.mil/ser7/finals2000A.daily

   Due to differences in the delivery times of the two products, users
   should exercise caution in blending the files to ensure that there is
   continuity between C04 and Bulletin A. 

2) Getting the new OPA EOP solution consisting of a continuous series
   derived from the concatenation of the C04 series and the OPA rapid
   solution available at:
   ftp://hpiers.obspm.fr/iers/series/opa/eopc04_IAU2000

3) The OPA files are now available at this location for users wishing to
   test the new file locations.

If users expect problems with this new arrangement, please contact
central_bureau@iers.org with their concerns. Subject line should include
"C04 transition".

Christian Bizouard and Daniel Gambis
IERS Earth Orientation Center
Observatoire de Paris


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