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Operational News

Operational news about Ssalto and Duacs processing system.

18.04.2019 [Saral/AltiKa] Data information

Dear SARAL/Altika users,

 Please take note of the disclaimer below :

 SARAL/AltiKa satellite encounters since 3rd of February 2019 some issues affecting the nadir pointing accuracy. ISRO Operational Team in charge of the platform is doing many efforts to fix the issues and to recover a nominal mission as soon as possible.  

The availability and the quality of data measurements is degraded from time to time. Nevertheless, Cnes, EUMETSAT and ISRO have decided to continue the dissemination of the near real time and off-line products;  Therefore, before using the data, Users are invited to remove any ocean data with “off_nadir_angle_wf” over 0.09 deg²; otherwise standard quality flags may be used.

 

GDR cycle 126 (31 December 2018-04 February 2019 is just released today. It covers the beginning of the degraded period and you are encouraged to read the associated Cal/Val report available on AVISO+. In brief, during this cycle mispointing is quite larger than usual from pass 962 (03/02/2019 06:21:18 ) due to this attitude deviation. Hence a higher percentage of rejected measurements (up to  80%) is observed starting at pass 962. The attitude deviation also explains the higher percentage of missing measurements Users are advised not to use data with off_nadir_angle > 0.09deg².[En savoir plus]


12.04.2019 [Jason-3] Jason-3 is back

This Morning, on a pass at 07:00UTC(i.e. on cycle 116, pass 246) all JASON-3 core mission instruments were restarted :

 

-POSEIDON at 07:16:24UTC

-AMR at 07:18:12UTC

-GPSPB at 07:20:01UTC

 

The first post-SHM mission telemetry has been delivered. First IGDRs will be Distributed on Monday April 15th.

 

 

[En savoir plus]


09.04.2019 [Jason-3]The Jason-3 spacecraft entered safe mode on Saturday, April 6, 2019 at 23:17:22 UTC

The Jason-3 spacecraft entered safe mode on Saturday, April 6, 2019 at 23:17:22 UTC, immediately interrupting its measurements.

SEALEVEL j3 datasets in NRT are no longer updated with fresh data up to the recovery of the mission.

 

Investigation in progress on CNES side, the root cause has not yet been identified. [En savoir plus]


27.03.2019 [SSALTO/DUACS] Jason-3 back in the NRT system as the reference mission

A few weeks ago, the Jason-3 acquisition was stopped due to a safe-hold mode (SHM) event. The event itself was processed swiftly by the operations teams, and the ongoing Cal/Val investigations now report nominal quality metrics and no significant impact beyond the short interruption itself.

 

Because Jason-3 is the so-called reference altimeter in the multi-mission system DUACS (CMEMS Sea-Level TAC), the temporary unavailability called for an emergency procedure in the NRT system. The procedure uses a temporary anchor altimeter (here: Sentinel-3A) to stabilize the NRT system until the reference altimeter is back in operations.

 

Because the anchor is not a reference altimeter, the system slowly drifts away from what would have been produced with the reference altimeter (particularly in NRT). Now that Jason-3 has collected enough measurements after the SHM event, the drift was estimated. As expected it is small thanks to the good quality of Sentinel-3A, but not zero.

 

The procedure to seamlessly (no offset) reduce the drift to zero and to switch back to Jason-3 as the reference altimeter will be executed over this week where the system will be in a nominal status (no bias in the system).

 

All efforts are made to make this transition invisible to the CMEMS & DUACS end-users.

 

Please feel free to report any suspicious finding you might have during this period.[En savoir plus]


14.03.2019 Planned outage on Extraction service and TDS Saturday March 16th

Due to a planned outage, AVISO Extraction service and TDS (Opendap) are going to be unavailalble Saturday March 16th between 8h UTC and 15h UTC.[En savoir plus]


13.03.2019 Wind/Wave gridded products production recovery

There were problems on the 3 satellites used to compute wind/wave maps : Jason-3 in Safe Hold Mode, Jason-2 also and Saral/AltiKa with strong problems.

All this leaded to a stop in the processing of those products. Since  March 11th, there are some maps which are produced but they only content OGDR data of Jason-3. As from March 12th, IGDR data of Jason-3 will be introduced.

Jason-2 and Saral have still some problems, so the date to reintroduce them it is not planned yet. [En savoir plus]


07.03.2019 [Jason-3] Jason-3 instruments have been restarted successfully

Jason-3 instruments have been restarted successfully on Wednesday, March, 6th, in cycle 113, pass 62 :

POSEIDON at 08:40:40UTC AMR at 08:42:10UTC GPSPB at 08:43:20UTC.

 

The first telemetry from the satellite was available around 11UTC : OGDRs are now generated normally.[En savoir plus]


05.03.2019 ebruary 2019: New version of L2P Non Time Critical Sentinel-3A products

The new version 02_01 is disseminated by AVISO+ via ftp or AVISO+ CNES Data Center (see the product sheet) with unchanged access (available in version_02_01 folder).

Note that the last cycle produced in version 02_00 has already been delivered (cycle 39). The next cycle 40 will be produced only in version 02_01.The version 01_00 will be removed from the ftp site. 

With this new version:

the input data are the “spring 2018 reprocessed” version of input NTC L2 products fully detailed in the EUMETSAT S3A STM reprocessing technical notethe retracking version is homogeneous for all the cyclesthe standards are the same as in 02_00 versionthe temporal coverage of L2P versions and L2 baseline used are:

  

S3A L2P NTC version 02_01S3A L2P NTC version 02_00S3A L2P NTC version 01_00temporal coverage15/06/2016 → present15/06/2016 → 02/01/201815/06/2016 → 02/01/2018based on L2 baseline collection003002 (till 17/11/2017) and 003 afterwards002

 You will find the details in the handbook [En savoir plus]


28.02.2019 [SSALTO/Duacs] Impact of Jason-3 unavailability in the NRT system

The DUACS system is facing an important reduction of upstream altimeter measurements. [En savoir plus]


27.02.2019 [Wind/Wave products] temporary interruption of merged production since February 27th 2019

Due to the interruption of upstream measurements: Jason-3, Jason-2 and Saral/Altika, the merged wind and wave products cannot be processed since today February 27th 2019. 

We are sorry for the inconvenience[En savoir plus]


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