ROM SAF - NRT Notification Detail

NRT Notification Detail

Scheduled outage/degration of GRAS level 1b data

DATE: 2009-12-16 13:15
TYPE: NRT-GTS

Description

Dear GRAS SAF GTS user Issued: 2009-12-16 13:15 Due to a GRAS parameter change tomorrow, 2009-12-17, there is a chance that GRAS SAF products will be missing or degraded. A new message will be issued after the outage. Please see the message from EUMETSAT below. ---snip--- Dear all, as you know, we changed some GRAS parameters controlling the raw sampling measurement mode on the instrument last Thursday (10 Dec), in effect extending the vertical range of the raw sampling data. We have now collected nearly a week of this data and will make it available to you (if you are interested) in late December or early January. As expected, the raise in the upper boundary for the raw sampling data for rising occultations also caused L2 measurements to not reach into the troposphere any more. As our operational processing currently requires L2 data to be present in order to produce level 1 data products from GRAS, this implies some degradation in our operational products. We have therefore decided (as initially planned) to revert the parameter settings back to their default values until our processing has been updated to extrapolate L2 measurements as part of the ionospheric correction, and the existing data set has been fully analyzed. We plan to perform the configuration change tomorrow, Thursday, 17. Dec 2009, around measurement time 09:36:40 UTC. The modification will cause a ~ 2 minute data gap. For those of you who use our operational products, please note that the Precise Orbit Determination system will experience a reset, with data being flagged as degraded for up to 8 hours after the configuration change. With kind regards, Christian. -- Dr. Christian Marquardt, Polar System Product Expert EUMETSAT, Am Kavalleriesand 31, D-64295 Darmstadt, Germany ---snip--- Kind regards The GRAS SAF Team

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