[IGSMAIL-6039]: late delivery of IGUs 1562_4_00 & 1562_4_06

[jim.ray at noaa.gov]

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IGS Electronic Mail      17 Dec 08:17:30 PST 2009      Message Number 6039
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Author: Analysis Center Coordinator

Due to an unscheduled, site-wide network outage overnight in the
U.S., the IGS Ultra-rapid combinations for 1562_4_00 and 1562_4_06
were generated and delivered to the Data Centers later than usual.

We apologize to users for any inconvenience.  But it is important to
stress that the current IGU orbit predictions have such high quality
that the prediction accuracy over the full 24 hr provided in each 
update degrades by only about a factor of two compared to the
predictions for the first 6 hr.  So we expect that the delay of these
two IGU updates should have minimal impact on user application
performance.  If this is not the case for some users, it would be
useful to receive further information.

http://acc.igs.org/