This animation shows global sea level data collected by the Surface Water and Ocean Topography (SWOT) satellite during its first 21-day science orbit, which it completed from July 26 to Aug. 16, 2023. Red and orange indicate ocean heights that were higher than the global mean sea surface height, while blue represents lower-than-the mean. Sea level differences can highlight ocean currents, like the Gulf Stream coming off the U.S. East Coast or the Kuroshio current off the east coast of Japan. Increased sea surface heights can also indicate regions of relatively warmer water – like the eastern part of the equatorial Pacific Ocean during an El Niño – because water expands as it warms. The SWOT science team made the measurements using the spacecraft's Ka-band Radar Interferometer (KaRIn) instrument. With two antennas spread 33 feet (10 meters) apart on a boom, KaRIn produces a pair of data swaths (tracks visible in the animation) as it circles the globe, bouncing radar pulses off the water's surface to collect surface-height measurements. Launched on Dec. 16, 2022, from Vandenberg Space Force Base in central California, SWOT is now in its operations phase, measuring the height of nearly all water on Earth's surface. The satellite will provide one of the most detailed, comprehensive views yet of the planet's oceans and fresh water lakes and rivers, collecting data that will be used for research and other purposes. Animation available at https://photojournal.jpl.nasa.gov/catalog/PIA26100