Remote sensing experts who are presenting at the Living Planet Symposium next month now have a fresh way to showcase their findings, thanks to a new open-access digital forum called Sentiboard. Launched in 2021, the forum enables the growing community of Copernicus Sentinel data users – from early career researchers to seasoned Earth science veterans – to share their latest contributions to remote sensing.
Sentinel-1A was unavailable on 25 April 2022 between 06:17 UTC and 09:35 UTC, due to a Payload Data Handling and Transmission (PDHT) sub-system anomaly. No data were generated during this period, data acquired slightly before this period may have been affected.
We apologize for the inconvenience caused.
Following the previous news on the Sentinel-1B anomaly that occurred on 23 December 2021, very detailed investigations related to the satellite power system’s affected unit have continued over the past weeks.
One potential failure scenario could be linked to a leakage of a ceramic capacitor which is part of the main and redundant regulators of the 28V power regulated bus (the bus that supplies power to the SAR electronics subsystem). Such scenario has been qualified by experts as possible. No conclusions have been drawn yet on the clear identification of the anomaly.
In parallel to the investigations, satellite system level analyses have been conducted, with the aim to perform new recovery attempts of the power unit. Using various commanding strategies, several attempts consisting in switching ON the prime and redundant regulators have been executed, some of them requiring substantial work and the preparation of new operational procedures.
In one of the many attempts to switch ON the prime regulator, the status of the regulator remained ON for 4.4 seconds and was then reverted autonomously to OFF, as observed through the related telemetry. This was the first time this change of status was observed since the start of the recovery attempts in early January 2022. This behaviour could indicate that the prime regulator features a degradation, but not necessarily a permanent failure.
Further tests will be performed over the next days and weeks, with the objective to understand the observed behaviour and potentially identify new recovery actions of the 28V regulated power bus. Some of the attempts will be executed by turning ON or OFF heaters hence varying the power supply temperature, this could influence the behaviour of the regulators.
The conclusions of the Anomaly Review Board are expected towards end of May 2022.
The satellite remains under control, the thermal control system works properly, regular orbit control manoeuvres are routinely performed.
Sentinel-1 users should still assume a long-term unavailability of data provision (several months). It is however too early to consider a permanent unavailability of Sentinel-1B.
We apologize for the inconvenience caused.
A maintenance activity on the Sentinel Users Bulletin Board website is foreseen on 20 April 2022, from 09:00 to 11:30 CET. During this time interval, the website may be unavailable. We apologise for any inconvenience this might cause to your activities.
Copernicus Sentinel-1A was unavailable between 20:52 UTC on 13 April 2022 and 08:34 UTC on 14 April 2022, due to a SAR anomaly. No data were generated during this period.
We apologize for the inconvenience caused.
A maintenance activity on the Sentinel Users Bulletin Board website is foreseen on 14 April 2022, from 13:00 to 15:00 CET. During this time interval, the website may be unavailable. We apologise for any inconvenience this might cause to your activities.
Due to Copernicus Sentinel-3A In-Plane orbit correction manoeuvre SLSTR products degradation is expected for sensing time from 13/04/2022T07:51:39 to 13/04/2022T08:01:43.
Due to Copernicus Sentinel-3B Lunar Calibration operation, instruments products degradation is expected for sensing time from 17/04/2022T05:11:19 to 17/04/2022T06:01:49.
Due to Copernicus Sentinel-3A orbit Instrument Calibration, SRAL products degradation is expected for sensing time from 13/04/2022T08:22:00 to 13/04/2022T08:24:00 and from 14/04/2022T18:16:37 to 14/04/2022T18:17:01.
Calling on all interested users of Sentinel data, who would like to submit their results, turning their experiences into 'success stories'.
If you have a good story to tell, of how any of the Sentinel satellites are producing data that bring benefit to your work and/or to society, please contact the Sentinel Online Editor Malì Cecere at: mali.cecere@ejr-quartz.com with your proposals.
