AVISO: Rss Feeds

[CFOSAT] Level-2 SWIM Product Evolution: Wave Slope Spectrum Range Extension{}

Wed, 22 Apr 2026 08:00:00 +0000

Dear user,

The CFOSAT Level-2 SWIM product in version 7.1 has been updated with a significant evolution: the extension of the slope spectrum range from 500 meters to 1112 meters. This improvement aims to enhance the product's accuracy and representativeness. For more detailed information, please refer to the Release Note: CFOSAT AWWAIS 7.1 main evolutions.

Key Changes and Improvements:

Slope Spectrum Extension: The slope spectrum has been extended from 500 meters to 1112 meters. However, parasitic peaks at wavelengths beyond 800 meters have been identified, impacting the detection performance of partitions.
Detection Limit Adjustment: To address this issue, the detection limit for partitions has been set to 800 meters. This adjustment reduces artificial rebounds observed around 400–450 meters, leading to a more accurate distribution.
High Correspondence Between Datasets: The matching between the old dataset (22.5–500 meters) and the new dataset (22.5–1112 meters) shows a high correspondence, particularly for partitions 1 and 2, with over 90% matching.

Scheduled maintenance – April 17 at 10:00 (CEST)

Thu, 16 Apr 2026 05:00:00 +0000

[16-04-2026] A short service interruption may occur tomorrow morning due to a system update.
During this time, some services (FTP, THREDDS Data Server) and the website may be briefly unavailable (up to 15 minutes).

Website Technical Issue [RESOLVED]

Mon, 15 Dec 2025 05:00:00 +0000

[19-12-2025: RESOLVED] We are currently experiencing technical difficulties that may affect access to our website. Our team is actively working to resolve these issues as quickly as possible. We apologize for any inconvenience this may cause and appreciate your patience during this time.

Maintenance Operation on the AVISO authentication services

Wed, 29 Oct 2025 09:41:07 +0000

Please be advised that there is currently a technical maintenance in progress on the AVISO authentication system. Consequently, there may be some disruption to the login and registration processes. The maintenance is scheduled to conclude on Friday, 31st.

[CFOSAT] Safe Hold Mode and maneuvers

Thu, 31 Jul 2025 10:02:08 +0000

With only three gyroscopes functioning (six at takeoff), the attitude control mode had to change. The biggest impact was on maneuver performance.

This is why CFOSAT went off course for several months. In collaboration with our Chinese (CNSA/NSOAS) partners, the CNES CFOSAT project team planned a series of maneuvers, and the satellite is now nearly in its nominal orbit. Please note that all products processed during this period are considered nominal.

[CFOSAT] Safe hold mode since May 10, 2025

Sun, 11 May 2025 09:00:00 +0000

Dear user,

Please note that CFOSAT has been in safe hold mode since May 10, 2025. We are working with our partners to retrieve the mission.

Best regards,

Aviso User Services

[CFOSAT] AWWAIS v7.1 main evolutions

Tue, 06 May 2025 09:00:00 +0000

Dear user,

Please note that for version 7.1 in production from 2025/02/18 to 2025/04/23, the SNR threshold has been modified from 1.1 to 0.7 for the combined beam only and not for the 10° beam. Since 2025/04/23 7:18, and following the correction of the speckle model described in the previous release note [CFOSAT_AWWAIS_V7.1_ReleaseNote.pdf (altimetry.fr), the SNR ratio is now set to 0.7 for 10° beam and combined beam.

To remember, this was chosen so as to find a compromise between improving the correlation coefficient between the wave elevation spectra from SWIM and from the MFWAM model, and not degrading the spectra in long and low swells regions. This change in the SNR threshold value does not change significantly the number of cases affected by the parasitic peak correction, which is about 30%.

[CFOSAT] Wrong input auxiliary files between 03/31/2025 - 04/07/2025

Mon, 14 Apr 2025 11:56:10 +0000

Dear user,

Please note that due to a software anomaly, L2ANAD products were generated with the auxiliary file CFO_TEST_AUX_WIND_F_20161219T000000_20991231T235959.bin
instead of
CFO_OPER_AUX_WIND__20181022T000002_20991231T235959.bin
over the 03/31/2025 - 04/07/2025 period.

The impact on ANAD products is limited to changes in WIND_SPEED values (enhancement).

Everything will be brought in line with the remove of TEST_AUX_WIND file in the database. Mission-wide consistency will be achieved during the next reprocessing phase.

[JASON-3] Evolution of (O/I)GDRs to the G-01 standard

Mon, 06 Jan 2025 14:26:08 +0000

The GDR-G standard, presented at the 30 Years of Progress in Radar Altimetry Symposium in Montpellier (France) in September 2024, improves sea level retrievals and ensures better consistency between altimetry missions. This standard will be shared with Sentinel-3 and Sentinel-6 to achieve the best scientific data processing algorithms available.

Please find complete information in the file.

Also in the presentation Lucas et al., GDR-G Altimetry Standards, 30 Years of Progress in Radar Altimetry Symposium, 2024

[CFOSAT] unsuccessful attempt to deploy AWWAIS 7.0

Fri, 20 Sep 2024 07:45:23 +0000

Please note that due to an unsuccessful attempt to deploy AWWAIS 7.0, CFO_OP06_SWI_L2ANAD products were generated with the auxiliary file CFO_TESTAUX_WIND__F_20161219T000000_20991231T235959.bin
instead of
CFO_OPERAUX_WIND__F_20181022T000001_20991231T235959.bin over the 08/30 - 09/16/2024 period.
ANAD products were also renamed to CFO_OPER_SWI_L2ANAD. The impact on ANAD products is limited to changes in WIND_SPEED values (enhancement).
Everything will be brought in line with the deployment of AWWAIS version 7.0. Mission-wide consistency will be achieved during the next reprocessing phase.

Recovery of the AVISO+ dissemination services

Thu, 18 Jul 2024 13:04:51 +0000

Services Impacted: FTP, SFTP, WMS, TDS, Data extraction service, MY AVISO+
Begin Date: 2024/07/18 12h00 (UTC)
End Date: 2024/07/18 1h00 pm (UTC)
Comments: disk space saturation

Temporary unavailability of the AVISO+ dissemination services

Thu, 18 Jul 2024 12:40:21 +0000

Services Impacted: FTP, SFTP, WMS, TDS, Data extraction service, MY AVISO+
Begin Date: 2024/07/18 12h00 (UTC)
Comments: Investigations are ongoing to resolve the issue
âââââââWe apologize for the inconvenience. Our support team is available for any further information (aviso@altimetry.fr)

[SWOT] Version C KaRIn Science Data Products Release

Wed, 10 Apr 2024 13:28:27 +0000

A brief update on the ongoing reprocessing of SWOT Version C KaRIn science data products:

All KaRIn LR (oceanography) data products from the calibration phase, except for cycle 565 pass 019, have been reprocessed and are now available.
Reprocessing of KaRIn LR products for the science phase continues, and products will continue to be distributed as they become available.
- Reprocessed LR science phase data will span cycles 1-9, only.
- Forward processed data from cycle 10 onward should be used.

Please note that the reprocessed calibration phase spans March 30 â July 10, 2023, and includes data from cycle 475 pass 26 to cycle 578 pass 004.

[SWOT] Reduced number of hydrology measurements (HR Mask) - South Africa internet failure

Wed, 27 Mar 2024 09:50:19 +0000

On March 15th, the CNES terrestrial link to South Africa suffered a major internet failure. Since that time it has unfortunately been impossible to recover any telemetry downloaded to our station in Hartebeesthoek. Given the large amount of telemetry generated by the SWOT satellite, the number of passes available in the CNES network to download all the data is insufficient. In order to avoid any loss of measurements, the satellite programming was updated on March 19 to reduce the number of land hydrology measurements (HR Mask) to 45% of the maximum possible data. On March 21, the programming has been re-tuned to increase the available hydrology data to approximately 76%.
Map showing the updated mask reduced to 76%.
This event is temporary and we will return to nominal measurements as soon as the terrestrial link with Hartebeesthoek is re-established.
The SWOT Project

[CFOSAT] SWIM specific acquisition sequence from 2024 January 12th to February 7th

Wed, 03 Jan 2024 10:28:33 +0000

A specific acquisition sequence of the SWIM instrument will be effective from 2024 January the 12th to February the 7th, which corresponds to CFOSAT orbital cycles 147 and 148.
During this period, the macrocycle, i.e. the sequence of beams illuminated, will be 0Â°, 2Â°, 10Â°, 10Â°, 10Â°, instead of the usual 0Â°, 2Â°, 4Â°, 6Â°, 8Â°, 10Â° sequence.
This specific programming of the instrument aims at getting data to analyze the impact and possibilities linked to the repeated sampling of the 10Â° beam on the Wave spectra and derived parameters performance.
Products will be delivered as usual during the period.
After the 7th of February, the instrument will come back to usual programming (0Â°, 2Â°, 4Â°, 6Â°, 8Â°, 10Â°).

[TOPEX] release of the fully reprocessed Geophysical Data Record (GDR-F version)

Wed, 08 Nov 2023 15:43:36 +0000

Dear AVISO users,
We are pleased to announce the release of a fully reprocessed version of the TOPEX/POSEIDON Geophysical Data Record (GDR-F version).
After an exhaustive examination of all archived information from the TOPEX/POSEIDON mission by NASA and CNES teams, this product has been generated by reprocessing data from the on-board instruments and applying the current GDR-F geophysical models.
More information on reprocessing can be found in the TOPEX/POSEIDON GDR-F user handbook:
https://www.aviso.altimetry.fr/fileadmin/documents/data/tools/hdbk_tpx_grdf.pdf

[CFOSAT] SWIM Processing anomaly since Oct 26 9h50TU and until Nov 2 0hTU

Tue, 31 Oct 2023 14:51:04 +0000

A processing anomaly occured on SWIM products on October 26th 9h50TU (beginning of cycle 141) and will continue until November 2nd 0hTU. Thus the delivery of SWIM L2 files is stopped until November 2nd 0hTU and the files delivered on the dissemination services since October 26th 9h50TU will be deleted and should not be used.

All apologize for the inconvenience.

[SWOT] The reprocessed SWOT 1-day orbit IGDR nadir altimeter products for the period from March 29 to July 10, 2023 are now available at AVISO.

Fri, 13 Oct 2023 07:26:36 +0000

Dear AVISO users,

The reprocessed SWOT 1-day orbit IGDR nadir altimeter products for the period from March 29 to July 10, 2023 are now available at AVISO.
Please note that some gaps remain in this reprocessed time series of IGDRs because either the raw IGDRs were not available or the available IGDRs could not be processed with the current version of the data processing software.
In addition, some outliers have been detected in this release of reprocessed 1-day orbit IGDRs and are being corrected in the processing and production of GDR data products.
However, please note that no additional 1-day orbit L2_NALT_IGDR beta pre-validated products are expected at this time.
The production of SWOT GDR products is expected to improve data availability and quality.
The public release of the SWOT GDRs is planned for the end of 2023.

[SWOT] Production and release of the SWOT products have resumed on September 28, 2023.

Wed, 04 Oct 2023 07:47:20 +0000

Production and release of the SWOT O/I(GDR) products have resumed in nominal conditions after the...

[SWOT] mission operations were stopped on September 21, 2023 due to a platform anomaly

Fri, 29 Sep 2023 12:12:57 +0000

Dear AVISO users,
Operations resumed on September 28, 2023. Following this restart, all SWOT data products are undergoing a quick validation process.
Data distribution will remain on hold until the validation is complete.