This announcement is a follow-up to the Cyclone Global Navigation Satellite System (CYGNSS) data processing announcement from March 14, 2023.
CYGNSS spacecraft altitudes began to occasionally drop below 500 km beginning on Jan. 8, 2023, during orbit perigee. L1-L3 v2.1 and v3.1 algorithms have recently been updated to properly calibrate samples made below 500 km and their data products beginning on March 19, 2023, now include these samples. The next planned product release is v3.2 and it will reprocess all samples below 500 km, beginning on Jan. 8, 2023.