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[Jason-2] Jason-2 back to operational mode

Fri, 12 Apr 2013 09:48:00 +0200

Jason-2 switched on to operational mode since April 5th. After validation the delivery of IGDRs has begun at beginning of cycle 175. Concerning NRT/RT SSALTO/Duacs products: as Jason-2 mission is used as a reference in SSALTO/Duacs processing, this data gap had an impact on the quality of NRT/RT products notably around the 5th of April, but this has been minimized thanks to the processing.

See related previous events:

2013/04/05 [Jason-2] Restart expected by Friday April 5th
2013/04/03 [Jason-2] Recovery in progress
2013/04/02 [Jason-2] new Safe Hold Mode
2013/03/29 [Jason-2] Restart of core mission
2013/03/28 [Jason-2] Start of recovery
2013/03/26 [Jason-2] Jason-2 in Safe Hold Mode since March 25th 03:30 UTC

[Jason-2] Restart of core mission

Mon, 08 Apr 2013 08:24:00 +0200

The Jason-2 satellite is again operational.

Friday 5th April, at 14:14z, the POSEIDON3 altimeter has been switched on; 2 hours after, AMR radiometer and precise GPS were also enabled (around 16:26z and 16:30z respectivelly) allowing the mission to restart nominally.

NRT products (OGDR) should be distributed by EUMETSAT and NOAA in the coming hours.
Off line products (IGDRs) will be produced with some delays and the routine production should resume nominally next week.

The Jason-2 mission was interrupted since cycle 174. Normal science operations will resume at beginning of cycle 175.

Jason-2 passengers will be switched on Monday 8th April.

I hope that our preferred satellite will let us now some quiet weeks….

Many thanks to the CNES and NOAA Ops teams for this quick and efficient recovery.

Thierry Guinle - CNES
on behalf EUMETSAT-NOAA-CNES-JPL Project Managers

See related previous events:

2013/04/05 [Jason-2] Restart expected by Friday April 5th
2013/04/03 [Jason-2] Recovery in progress
2013/04/02 [Jason-2] new Safe Hold Mode
2013/03/29 [Jason-2] Restart of core mission
2013/03/28 [Jason-2] Start of recovery
2013/03/26 [Jason-2] Jason-2 in Safe Hold Mode since March 25th 03:30 UTC

[Jason-2] Restart expected by Friday April 5th

Fri, 05 Apr 2013 08:20:00 +0200

Some fresh news from the Jason-2 control center…. All the recovery operations are going smoothly and without any trouble until now. STAM helio was achieved on 04^th April at 18:45z and the STAM Geo is now confirmed at 15:16z. On 5^th April, Jason-2 will be back in nominal mode and the core payload switch on will be performed. If everything is OK, we should resume the mission around 16:45z. Passengers will be turned on 8^th April. In addition to the satellite operations, CNES, NOAA and EUMETSAT teams have also worked on the ground facilities in order to be able to process data as soon as the first measurements will become available. Thierry Guinle
on behalf EUMETSAT-NOAA-CNES-JPL Project Managers

See related previous events:

2013/04/03 [Jason-2] Recovery in progress
2013/04/02 [Jason-2] new Safe Hold Mode
2013/03/29 [Jason-2] Restart of core mission
2013/03/28 [Jason-2] Start of recovery
2013/03/26 [Jason-2] Jason-2 in Safe Hold Mode since March 25th 03:30 UTC

[Jason-2] Recovery in progress

Wed, 03 Apr 2013 14:51:00 +0200

As previously reported (see our news), the Jason-2 spacecraft entered again in safe mode on 30 March 2013 at approximately 22:31:56z.

Jason-2 went to safe hold mode outside a CDAS/USG fly-by, outside South Atlantic Anomaly and the failure caused an automatic switch to the redundant payload module (PM-B). Then Jason-2 converged to nominal 'BBQ' mode. As for the previous occurrence no on board alarms can be seen in the telemetry.

On Tuesday April 2nd, CNES and Thales Alenia Space (TAS) experts discussed several options for the anomaly; this exercice is very difficult because we face a lack of information and we are unable to identify clearly a root cause. Due to the experience on Jason-1 (a lot of memory troubles due to the aging on this agressive orbit), the most probable scenario (not yet confirmed) is an anomaly in the memory detected by the on board software and causing the reconfiguration. An action plan is currently defined with TAS and a progress status is expected by the next REVEX.

To date other diagnostics of the spacecraft did not detect any trouble in the sub-systems. Even if the current failure appeared again on PM-A, it remains usable as platform redundancy. Nevertheless, for the mission, it has been decided this time to resume it on platform module B. This is the only change wrt the previous recovery done last week and we hope it will be successful.

The requested platform recovery operations for resuming the nominal mission have started Tuesday April 2nd and are now well underway with gyros, star trackers and reaction wheels switched ON. DORIS instrument is also operational since 17:27z. The OPS teams from CNES and NOAA are working closely to conduct operations and to monitor the spacecraft carefully.

The recovery procedure has been optimized and the current schedule foresee to turn on the Jason-2 payload core science instruments (POSEIDON3, AMR, GPSP) on Friday, 5 April, and full science operations will resume later that day. Jason-2 passengers (LPT, CARMEN2, T2L2) will be turned on on Monday, 8 April.

Of course this schedule is optimistic… there is no margin and it does not take into account any unexpected event!

Cycles 174 and Cycle 175 (which begun on 02 April at 09:03z) will be impacted.

We'll keep you informed on the status in the next days,

Thierry Guinle
on behalf EUMETSAT-NOAA-CNES-JPL Project Managers

See related previous events:

2013/04/02 [Jason-2] new Safe Hold Mode
2013/03/29 [Jason-2] Restart of core mission
2013/03/28 [Jason-2] Start of recovery
2013/03/26 [Jason-2] Jason-2 in Safe Hold Mode since March 25th 03:30 UTC

[Jason-2] new Safe Hold Mode

Tue, 02 Apr 2013 09:45:00 +0200

Few hours after the recovery, the Jason-2 spacecraft entered again in safe mode on 30 March 2013. As for the previous SHM, no evident root cause has been seen in the first analysis performed over the week-end. Expert teams from CNES and industry (TAS) have been activated and a first meeting is planned on 2 April 2013.

The satellite is currently in a safe and stable Sun-pointing configuration. The 4 partners operational teams are working closely to support current and future operations. The mission will resume as soon as this anomaly is understood, and we will keep you informed of our progress.

Sorry for this bad news,

Thierry Guinle
on behalf EUMETSAT-NOAA-CNES-JPL Project Managers.

[Jason-2] Restart of core mission

Fri, 29 Mar 2013 09:31:00 +0100

The Jason-2 satellite is again operational.

On 2013/03/29, at 17:48z, the POSEIDON3 altimeter has been switched on; 2 hours after, AMR radiometer and precise GPS were also enabled (around 19:34z and 19:37z respectivelly) allowing the mission to restart nominally .

The Jason-2 mission was interrupted during Cycle 174. Cycle 174 will be impacted approximatively from passes 43 to 164.

I suppose that all of you will join my thanks to the CNES and NOAA OPS teams for this quick and successfull recovery.

Thierry Guinle - CNES

on behalf EUMETSAT-NOAA-CNES-JPL Project Managers

[Jason-2] Jason-2 status update - start of recovery

Thu, 28 Mar 2013 10:53:00 +0100

The Jason-2 spacecraft entered safe mode on 25 March 2013 at approximately 03:30:59z.

Jason-2 went to safe hold mode (SHM) during an Usingen pass, five minutes after a READMM telecommand. No on board alarms can be seen in the telemetry. The SHM caused an automatic switch to the redundant payload module (PM-B). Then Jason-2 converged to nominal 'BBQ' mode.

As the mission was running since the beginning on PM-A (allowing PM-B to be a full platform redundancy), CNES decided to switch back to PM-A in order to verify its status. During the autotest, one error inside the onboard memory was identified; after investigation this memory error was declared non critical and also not related to the previous SHM. To date diagnostics of the spacecraft by CNES and Thales Alenia Space (TAS) did not detect any trouble in the sub-systems or any loss of redundancy. Thus decision to remain on PM-A and to give priority to the recovery was approved.

The requested platform recovery operations for resuming the nominal mission have started on Tuesday 26th and are now well underway with gyros, star trackers and reaction wheels switched ON the 27th. DORIS instrument is operational since 26 March 02:20z. The OPS teams from CNES and NOAA are working closely to conduct operations and to monitor the spacecraft carefully. Due to orbital configuration most of recovery operations are performed during the european night!

The current schedule foresee to turn on the Jason-2 payload core science instruments (POSEIDON3, AMR, GPSP) on Saturday, 30 March, and full science operations will resume later that day. Jason-2 passengers (LPT, CARMEN2, T2L2) will be turned on on Tuesday, 2 April.
Of course this schedule is optimistic… there is no margin and it does not take into account any unexpected event.
The Jason-2 mission was interrupted during Cycle 174. Cycle 174 will be impacted approximatively from passes 43 to 168. Normal science operations will resume prior to Cycle 175, which begins on 02 April at 09:03 UT.

Very best regards,

Thierry Guinle - CNES
on behalf EUMETSAT-NOAA-CNES-JPL Project Managers

[Jason-2] Jason-2 in Safe Hold Mode since March 25th 03:30 UTC

Tue, 26 Mar 2013 10:30:00 +0100

The satellite is currently in a safe and stable Sun-pointing configuration. To date no root cause has been clearly identified. Expert teams from CNES and industry (TAS) have been activated. The 4 partners operational teams are working closely to support current and future operations. The mission will resume as soon as this anomaly is understood, and we will keep you informed of our progress.

Very best regards.

Thierry Guinle

CNES Jason-2 Project Manager