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NRT Notification Detail

Outage of GRAS level 1b data

DATE: 2010-04-14 07:58
TYPE: NRT-GTS

Description

Dear GRAS SAF GTS User Issued: 2010-04-14 07:58 UTC We experienced a outage of GRAS level 1b data yesterday due to a transient outage of the GRAS instrument. Last occultation processed before the outage is dated 2010-04-13 14:24:05 UTC, and first occultation processed after the outage is dated 2010-04-13 19:31:44 UTC. Both times is instrument sensing times. Please see detailed messages from EUMETSAT below. Kind regards The GRAS SAF Team. Received message: (with small correction, based on later email) From: Christian Marquardt Subject: RE: GRAS instrument switchoff Sent: 2010-04-14 06:41 UTC Dear all, this is just to confirm that the processing of GRAS data has recovered as expected; GRAS level 1 data exhibits nominal quality again since about 19:25 UTC (corrected from 22:00 UTC) on 13. April 2010. As usual, bending angle flagging has been set to degraded for a longer period (until about 02:00 UTC). Christian. Received message: From: Christian Marquardt Sent: 13 April 2010 23:20 Subject: RE: GRAS instrument switchoff Dear all, an initial analysis of the GRAS instrument going into standby mode after a memory checksum error at 14:30 UTC suggested that the problem was due to corrupted memory which should be recovered by power cycling the instrument. This was performed during a Svalbard pass at 16:19UTC. The absence of Memory Checksum Failures and "Memory scanning completed successfully" messages during later passes confirmed that the memory corruption was indeed transient and successfully cleared by the power cycling. GRAS has been put into occultation mode again and delivers science data since 17:48 UTC; the processing of the data commenced successfully. As usual, the Precise Orbit Determination will require 4-6 hours until it has converged to nominal quality again. Based on our previous experience, we therefore expect higher level products to be within nominal requirements for measurement times around 23:00 UTC. Note that the bending angle quality in the level 1b data products from GRAS will continue to be flagged as degraded for at least 8 hours after the POD reset, i.e. until around 02:00 UTC. WIth kind regards, Christian. -- Dr. Christian Marquardt, Polar System Product Expert EUMETSAT, Am Kavalleriesand 31, D-64295 Darmstadt, Germany

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