ROM SAF - NRT Notification Detail

NRT Notification Detail

Scheduled outage/degradation of GRAS level 1 b data,

DATE: 2011-06-08 12:51
TYPE: NRT-GTS

Description

Dear GRAS SAF GTS User Issued 2011.-06-08 12:50 UTC Due to a scheduled Metop in-plane maneouvre tomorrow around 13:12 UTC and a forecasted geomagnetic storm, upstream GRAS level 1b data and GRAS SAF products can be excepted to be degraded from later today until tomorrow evening. The possible degradation due to the geomagnetic storm is expected to have little or no impact on the GRAS SAF refractivity product. Follow-up messages will be posted if degradation do indeed occur. GRAS SAF data will be flagged as degraded for a period after the Metop maneouvre. Please see detailed message from Eumetsat below. Kind regards The GRAS SAF Team Forwarded message: Subject:GRAS: maneouvre on 09 Jun 2011 & anticipated geomagmnetic storm From: Christian Marquardt Date: 2011-06-08 07:28 UTC Dear all, we'd like to give you two warnings ahead of time related to possible degradations of GRAS level 1 data quality: 1) Tomorrow, 09 June 2011, the Metop-A satellite will undergo an in-plane maneouvre around 13:12 UTC. As usual, the GRAS Precise Orbit Determination will require a reset, and data quality will be degraded until it has converged again. Bending angle data *will* be flagged accordingly for up to 4 hours after the POD reset. 2) NOAA (http://www.nws.noaa.gov/) has issued a warning on an upcoming geomagnetic storm expected for later today and parts of tomorrow, related to one of the strongest coronal mass ejections observed on the sun since 2006. As the event was not directed towards the Earth, though, the impact on our environment appears to be limited. In past, we experienced slight degradation of the GRAS bending angle data at altitudes above 35 km under similar conditions, usually showing up a asymmetric (between rising and setting occultations) biases in the order of 1 - 3 microradians at these altitudes. This issue is caused by a less-than-optimal configuration of our processing system. We are watching the data quality closely and will let you know if any degradation in the data quality does indeed set in. Please note that data affected by this *will not* be flagged as degraded. With kind regards, Christian. -- Dr. Christian Marquardt, Polar System Product Expert EUMETSAT, Am Kavalleriesand 31, D-64295 Darmstadt, Germany

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