Date: Mon, 05 Jan 2009 08:32:56 -0500 From: "Jim.Ray" Subject: [IGSMAIL-5875]: excess instability in IGRT timescale during wk 1512 To: IGSMail Reply-to: jim.ray@noaa.gov Message-id: <49620C08.3070404@noaa.gov> Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7bit User-Agent: Thunderbird 2.0.0.18 (Windows/20081105) Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 05 Jan 05:33:02 PST 2009 Message Number 5875 ****************************************************************************** Author: Jim Ray Due to a very minimal number of Rapid clock solutions available during 31 Dec 2008 - 01 Jan 2009, the IGRT timescale used to align the IGS Rapid clock products experienced an unusually high level of instability during that period. It remained much better than BRDC GPS time, however. Note that this should have minimal impact on geodetic positioning results, which are not sensitive to the level of clock instability. Users of IGS Rapid products for time/frequency transfer applications should be aware of this issue and are advised to consider reprocessing their results when the IGS Final products are issued next week. Our apologies for any inconvenience to users.