Following the announcement on 14 March regarding the resumed publication of Copernicus Sentinel-2 L2A products, we regret to inform you that the impact of the infrastructure maintenance executed on 12 March is also affecting products acquired up to 15 March. It is foreseen that these will be recovered in the next few days.

Collision avoidance manoeuvres were executed on Copernicus Sentinel-1A on 18 March, to reduce the risk of collision with a debris, which was potentially due to occur at 05:31 UTC.

Four Sentinel-1A data download links through the European Data Relay Satellite System (EDRS), taking place between 02:28 and 09:08 UTC, had to be cancelled due to these orbit manoeuvres. SAR acquisitions taking place slightly before and during this period may have been affected.

ESA is pleased to announce the official release of the Copernicus Sea and Land Surface Temperature Radiometer (SLSTR) Sentinel-3A and -3B products on the Collaborative Data Hub.
Copernicus Sentinel-3A SLSTR products will be published on the Collaborative Data Hub on 20 March 2019 and the Sentinel-3B products will follow the next day on 21 March.
The transition from the S3 Pre-operations Hub to Collaborative Data Hub includes the publication on the Access Node 1 of the Non-Time Critical (NTC) historical data belonging to the 2.45 Processing Baseline – Collection Baseline 003 (a reference will be provided as soon as available) replacing the previous Collection Baseline 002.
More specifically, the Copernicus Sentinel-3A SLSTR data has been re-processed to Processing Baseline 2.45, providing a homogeneous time series from the start of the S3A mission aligned to the current S3A and S3B processing baseline.
The S3-A re-processed dataset will cover Level-1 and Land Level-2 products (SL_1_RBT and SL_2_LST) with sensing date from 19 April 2016 to 05 April 2018.
Products can be identified by filenames ending with '*_LR1_R_NT_003';
Where R (re-processed) products at LR1 (Land Reprocessing Centre #1) belong to product Collection Baseline 003; in contrast to the old products which ended with '*_LN2_O_NT_00x', with x equal to 1 or 2.
The NTC historical data will gradually be released on Node 1 in the following month in parallel to the new data production.
The NRT and NTC systematic fresh data will be published with the rolling policies of the respective Access Nodes.
The Sentinel-3 Pre-Operational Hub will continue to publish new data until completion of the transition of the NTC historical dataset to the Access Node 1.

Following the announcement on 12 March, the publication of Copernicus Sentinel-2 L2A products on the nominal flow resumed as of 18:00 UTC on 13 March 2019.

The recovery of missing L2A products on 12-13 March has begun and will be completed within this week.

Users are informed that as a side effect of the Infrastructure Maintenance scheduled on 12 March (please refer to the related news), the publication of Sentinel-2 L2A products has been impacted and it is currently suspended since 13:00 UTC, 12 March 2019.
Publication will be resumed as soon as possible. Further news will follow.
No impact on the nominal Level-1C products publication.
We apologise for any inconvenience this may cause to your activity.

Referring to the earlier announcement of 7 March 2019, users are informed that the deployment of the subject evolution planned on 11 March was cancelled due to shortcomings identified in the product quality validation performed in preparation of this evolution.

Due to a Ground Segment anomaly occurred on 9 March 2019, Near Real Time, Non Time Critical and Short Time Critical Copernicus Sentinel-3B products related to orbit #4528 are completely missed (sensing time from 09-03-2019T06:22:47 UTC to 09-03-2019T08:04:17 UTC).

Users are informed that some Copernicus Sentinel-2B planned acquisitions have been lost due to a collision avoidance manoeuvre executed on the evening of 6 and 7 March.

Further news will be published to provide the extent of the data loss.

On Monday 11 March 2019, a minor change of the Copernicus Sentinel-2 Level-1C and Level-2A products will be implemented: the compression rate of the Preview Image (PVI) will be reduced in order to improve the quality of the images.

This change will not affect the product format or scientific content (IMG_DATA).

It is further clarified that the products following this evolution will keep being tagged according to the processing baseline number 02.07 for the L1C products and 02.11 for L2A products (the PB identifier is kept unchanged).

Due to a Ground Segment anomaly occurred on 5 march 2019, Near Real Time and Short Term Critical SRAL Level 1 (SR_1_SRA_) and Level 2 (SR_2_LAN) Copernicus Sentinel-3A products starting in the following sensing time:
05-03-2019T13:53:44 UT to 05-03-2019T15:27:27 UTC are missed.

Recovery is ongoing.

Due to set of special operations performed on the Copernicus Sentinel-3A SRAL instrument all the NRT/STC/NTC data could be degraded or missing in the following sensing time intervals:

• From 2019-03-01 08:50 UTC to 09/03/2019 00:00 UTC (7 days 15:50): possibly degraded data
  
• From 2019-03-01 08:50 UTC to 09/03/2019 00:00 UTC (7 days 15:50): no data for around 2 mins, 3 to 4 times per day
  
• From 2019-03-08 14:08 UTC to 08/03/2019 14:20 UTC (0 days 00:12): no data due to instrument restart.

Infrastructure Security Maintenance activities are scheduled on:

• Tuesday, 12 March
  
• Wednesday, 13 March
  
• Monday, 18 March
  
• Tuesday, 19 March
  

The maintenance will affect the Data Hub Services according to the following programme:
12 and 13 March from 07:00 to 16:30 UTC
Activities on security are foreseen on the following data hub instances, causing the publication delay of all Copernicus Sentinel-1, Copernicus Sentinel-2 and Copernicus Sentinel-3 products:

• Scientific Data Hub (including SciHub, API Hub and Sentinel-3 Pre-operations Data Hub)
  
• International Access Hub
  
• Copernicus Services Data Hub
  
• Collaborative Data Hub
  

Monday, 18 March from 07:00 to 16:30 UTC
Service interruptions might occasionally occur during the maintenance window on the following data hub instances:

• Copernicus Open Access Hub (also including API Hub and GNSS Rinex Pre-operational Hub)
  

Tuesday, 19 March from 07:00 to 16:30 UTC
Service interruptions might occasionally occur during the maintenance window on the following data hub instances:

• Copernicus Services Data Hub
  
• Sentinel-3 Pre-operations Data Hub
  
• Collaborative Data Hub - Node 1
  

The Collaborative Data Hub - Node 2 and Node 3 will continue to be accessible to their registered users.

We apologize for any inconvenience caused to your activities.

Due to a Ground Segment anomaly that occurred on 5 March, Near Real-Time SRAL Level 1 (SR_1_SRA_) and Level 2 (SR_2_LAN) Copernicus Sentinel-3A products acquired between 13:54:44 and 15:27:27 UTC are missing.

Due to an issue that occurred at Network level, Near Real Time SLSTR, OLCI, and SRAL Level 1 and Level 2 Copernicus Sentinel-3A and Sentinel-3B products are delayed in the following timeslots:

SLSTR:

• From 01-03-2019T12:08:00 to 01-03-2019T13:40:00
  
• From 03-03-2019T00:55:00 to 03-03-2019T03:56:00
  

SRAL:

• From 01-03-2019T10:52:00 to 01-03-2019T11:23:00
  
• From 01-03-2019T18:37:00 to 01-03-2019T18:38:00
  
• From 02-03-2019T22:47:00 to 03-03-2019T01:00:00
  

OLCI:

• From 01-03-2019T11:38:00 to 01-03-2019 T 11:42:00
  
• From 03-03-2019T21:56:00 to 03-03-2019 T 23:42:00.
  

Recovery is now completed.

Users are informed that the infrastructure incident that caused a degradation of the data access services has been solved as of 03 March 2019 at 01:45 UTC.
The incident was caused by a disk failure in the front-end nodes accessing the storage to which the virtual machines are connected. The FlexProtect job run for several hours for repairing the nodes and drives and for protecting the data. It took the majority of resources. During this time the performance for accessing the data on the storage were degraded and both the users downloads and the products publication were affected.
Data fetching from the PDGSs has been resumed. Products publication on all data access services is gradually absorbing the production backlog and download rates are back to nominal.

We apologise for the inconvenience that this might have caused to your activity.

A Sentinel-1B satellite unavailability occurred on 27 February 2019 from 23:21:26 UTC to 28 February 2019 15:13:19 UTC.

No SAR data were acquired during this period.

Users are informed that there has been a blocking infrastructure incident at one of the data hub centres on 01 March 2019 starting from 13:20 UTC leading to a downtime of the following dissemination services:

• Open Access Hub (including API Hub)
  
• Copernicus Services Data Hub
  
• Collaborative Data Hub Node 1
  
• Sentinel-3 PreOps
  
• GNSS Rinex PreOps
  

Commissioning services are also affected.
The publication of new products on ColHub Node 2 and Node 3 and on the International Access Hub is temporarily delayed.

The incident is under investigation with the on-site engineers. An update will be provided as soon as the failures are isolated and a schedule for service recovery will be available.
We apologize for the inconvenience this may cause.

Copernicus Sentinel-1B was unavailable on 23 February 2019 between 12.00 UTC and 15:07 UTC, due to a SAR anomaly.

No data were generated during this period.

The Data Hub Software will be gradually updated to the latest version with a series of activities scheduled from 26 February to 7 March 2019.
The maintenance will affect the Collaborative Data Hub service according to the following programme:

Tuesday, 26 February, from 07:30 UTC to 16:30 UTC
During the maintenance window the Collaborative Data Hub Node 1 might experience periods of downtime.

Wednesday, 27 February, from 07:30 UTC to 16:30 UTC
During the maintenance window the Collaborative Data Hub Node 2 might experience periods of downtime.

Thursday 28 February, from 07:30 UTC to 16:30 UTC
During the maintenance window the Collaborative Data Hub Node 3 might experience periods of downtime.

Monday 4 March, from 07:30 UTC to 16:30 UTC
During the maintenance window the publication of Sentinel-3 products on Node 3 will be delayed for some hours.

Tuesday, 5 March, from 07:30 UTC to 16:30 UTC
During the maintenance window the publication of Sentinel-3 products will be delayed for some hours on all access nodes.

Wednesday 6 March, from 07:30 UTC to 16:30 UTC
During the maintenance window the publication of Sentinel-1 and Sentinel-2 L1C products will be delayed for some hours on all access nodes.

Thursday 7 March, from 07:30 UTC to 16:30 UTC
During the maintenance window the publication of Sentinel-3 and Sentinel-2 L2 products will be delayed for some hours on all access nodes.

Following the temporary interruption of the Sentinel-1 Long Term Archive service due to an infrastructure anomaly, users are informed that the service has been resumed this morning at 09:20 UTC.

We apologise for any inconvenience this might have caused to your activities.