CloudSat Resumes Science Operations
2022 Feb 1 at 2209 UTC
The CloudSat Cloud Profiling Radar returned to daytime-only operations on 16 December, 2021.
After a series of innovative changes to the command loads on the spacecraft, Ball Aerospace engineers were able to use the remaining momentum wheels and torque-rods to stabilize the craft and allow the re-activation of the CPR instrument. After the long period of dormancy, the radar is performing nominally, and the mission will now operate in the same day-time-only mode that was in place prior to the momentum wheel failure on August 27th of 2020.
The new stabilization procedure is producing a harmonic offset in the “roll” and “pitch” direction of the spacecraft axis, resulting in a radar bore-sight pointing offset that varies from approximately 2-6 degrees off-nadir. Engineering data from the spacecraft has been successfully applied to the science data to correct the geolocation of each CPR profile.
After review by the CloudSat Science Team, this unique data set will be processed and released, along with roll and pitch offset parameters.
The real-time “QuickLook” images and granule specifications will continue to be available on this website.
The DPC website has been updated
2021 Sep 29 at 2202 UTC
We've completely revamped our website and are continuing to work on our data distribution system. Here are some things to keep in mind during this transition:
- If you had an account on the old site you'll be prompted to update your password when you log in here the first time. You may continue to use your old credentials if you like. For security reasons we are not able to transfer passwords from the old website to the new one.
- While we work on the new direct file access mechanism you will still be able to access the old FTP server at ftp.cloudsat.cira.colostate.edu using your old website credentials. The credential databases are not yet synchronized.
- If you register a new account on this website and need access to the direct access FTP server, please request access on the Contact Form.
Thank you for your patience as we get the bugs ironed out. If you notice any or have any feedback please let us know via the Contact Form.
The CloudSat DPC Team
Products Reprocessed For Data Dates Between 19 May 2018 and 11 July 2019
2020 Dec 9 at 2201 UTC
A spacecraft timing issue was discovered that resulted in an along-track offset between the radar surface return and the calculated DEM elevation. The magnitude of the error ranges from 2-5 profiles and primarily affects data analysis that is concerned with the lowest range bins and the geolocation matchup for radar-lidar products. The timing issue has been fixed and the following data products have been reprocessed between the data dates of 19 May 2018 and 11 July 2019:
The new files have an updated "fix" number in the file names: F03. For example:
Reaction Wheel Anomaly - No New Data Available
2020 Aug 27 at 2200 UTC
CloudSat suffered a failure of one of its three remaining reaction wheels on August 27th, 2020 which automatically put the spacecraft into standby mode. Radar data collection has ceased until the team determines if operations can continue with two wheels.
CloudSat exits the A-Train
2018 Feb 22 at 2159 UTC
After almost 12 years of flying in formation with its A-Train partners, CloudSat safely exited the constellation on February 22nd, 2018 to begin a solo career. The current status of the reaction wheels is being analyzed by JPL and Ball Aerospace and a plan to return to Daylight-Only Operations (DO-Op) is being formulated.
CloudSat momentum wheel anomaly and status
2018 Jan 24 at 2159 UTC
CloudSat is currently in standby mode due to a spacecraft momentum wheel anomaly. Due to safety concerns, the CloudSat spacecraft will be executing a maneuver to lower it’s orbit and leave the A-Train. If that maneuver is successful, CloudSat should return to daytime-only operation sometime in the mid-February timeframe. Co-located CloudSat and CALIPSO data products will only be available after the orbit change, and co-located MODIS-AUX products will only be available during the period where CloudSat flies under the MODIS data swath. ECMWF-AUX products will continue to be produced along with radar-only standard CloudSat products.
CloudSat Reaction Wheel Anomaly
2017 Jul 10 at 2158 UTC
The CloudSat spacecraft entered standby mode on June 4th, 2017 after experiencing a problem with one of its four reaction wheels. Tests are underway to determine how to solve the problem and resume operations.