Jason-1

Jason-1 was an ocean altimetry satellite designed to measure global sea surface height and ocean circulation with high precision. It used a radar altimeter to map ocean topography, tracking phenomena like El Niño and long-term sea-level rise. The data contributed to climate science and weather forecasting.

Yes, Jason-1 was the direct successor to the TOPEX/Poseidon satellite, a joint NASA/CNES mission that pioneered precision ocean altimetry from space. Jason-1 continued the same orbital track and measurement techniques as its predecessor. This continuity enabled long-term datasets critical for tracking sea-level change.

Jason-1 was a collaborative mission between NASA and CNES, the French space agency. NASA provided the launch vehicle and some instruments, while CNES contributed the spacecraft and primary altimeter. The partnership continued through subsequent Jason missions.

Jason-1 was decommissioned after its mission ended in 2013, having far exceeded its planned operational lifetime. It was followed by Jason-2 and later Jason-3, which continued the same sea-level monitoring program. The Jason series represents one of the longest-running ocean altimetry programs in satellite history.