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By NASA
4 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Daily images of ice cover in the Arctic Ocean (left) and around Antarctica reveal sea ice formation and melting at the poles over the course of two years (Sept 14, 2023 to Sept. 13, 2025).Trent Schindler/NASA’s Scientific Visualization Studio With the end of summer approaching in the Northern Hemisphere, the extent of sea ice in the Arctic shrank to its annual minimum on Sept. 10, according to NASA and the National Snow and Ice Data Center. The total sea ice coverage was tied with 2008 for the 10th-lowest on record at 1.78 million square miles (4.60 million square kilometers). In the Southern Hemisphere, where winter is ending, Antarctic ice is still accumulating but remains relatively low compared to ice levels recorded before 2016.
The areas of ice covering the oceans at the poles fluctuate through the seasons. Ice accumulates as seawater freezes during colder months and melts away during the warmer months. But the ice never quite disappears entirely at the poles. In the Arctic Ocean, the area the ice covers typically reaches its yearly minimum in September. Since scientists at NASA and the National Oceanic and Atmospheric Administration (NOAA) began tracking sea ice at the poles in 1978, sea ice extent has generally been declining as global temperatures have risen.
“While this year’s Arctic sea ice area did not set a record low, it’s consistent with the downward trend,” said Nathan Kurtz, chief of the Cryospheric Sciences Laboratory at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
Arctic ice reached its lowest recorded extent in 2012. Ice scientist Walt Meier of the National Snow and Ice Data Center at the University of Colorado, Boulder, attributes that record low to a combination of a warming atmosphere and unusual weather patterns. This year, the annual decline in ice initially resembled the changes in 2012. Although the melting tapered off in early August, it wasn’t enough to change the year-over-year downward trend. “For the past 19 years, the minimum ice coverage in the Arctic Ocean has fallen below the levels prior to 2007,” Meier said. “That continues in 2025.”
Antarctic sea ice nearing annual maximum
As ice in the Arctic reaches its annual minimum, sea ice around the Antarctic is approaching its annual maximum. Until recently, ice in the ocean around the Southern pole has been more resilient than sea ice in the North, with maximum coverage increasing slightly in the years before 2015. “This year looks lower than average,” Kurtz said. “But the Antarctic system as a whole is more complicated,” which makes predicting and understanding sea ice trends in the Antarctic more difficult.
It’s not yet clear whether lower ice coverage in the Antarctic will persist, Meier said. “For now, we’re keeping an eye on it” to see if the lower sea ice levels around the South Pole are here to stay or only part of a passing phase.
A history of tracking global ice
For nearly five decades, NASA and NOAA have relied on a variety of satellites to build a continuous sea ice record, beginning with the NASA Nimbus-7 satellite (1978–1987) and continuing with the Special Sensor Microwave/Imager and the Special Sensor Microwave Imager Sounder on Defense Meteorological Satellite Program satellites that began in 1987. The Advanced Microwave Scanning Radiometer–for EOS on NASA’s Aqua satellite also contributed data from 2002 to 2011. Scientists have extended data collection with the 2012 launch of the Advanced Microwave Scanning Radiometer 2 aboard a JAXA (Japan Aerospace Exploration Agency) satellite.
With the launch of ICESat-2 in 2018, NASA has added the continuous observation of ice thickness to its recording. The ICESat-2 satellite measures ice height by recording the time it takes for laser light from the satellite to reflect from the surface and travel back to detectors on board.
“We’ve hit 47 years of continuous monitoring of the global sea ice extent from satellites,” said Angela Bliss, assistant chief of NASA’s Cryospheric Sciences Laboratory. “This data record is one of the longest, most consistent satellite data records in existence, where every single day we have a look at the sea ice in the Arctic and the Antarctic.”
By James Riordon
NASA Goddard Space Flight Center
Media contact: Elizabeth Vlock
NASA Headquarters
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Last Updated Sep 17, 2025 LocationNASA Goddard Space Flight Center Related Terms
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By NASA
From left to right, NASA’s Carruthers Geocorona Observatory, IMAP (Interstellar Mapping and Acceleration Probe), and the National Oceanic and Atmospheric Administration’s (NOAA) Space Weather Follow On-Lagrange 1 (SWFO-L1) missions will map our Sun’s influence across the solar system in new ways. Credit: NASA NASA will provide live coverage of prelaunch and launch activities for an observatory designed to study space weather and explore and map the boundaries of our solar neighborhood.
Launching with IMAP (Interstellar Mapping and Acceleration Probe) are two rideshare missions, NASA’s Carruthers Geocorona Observatory and the National Oceanic and Atmospheric Administration’s (NOAA) Space Weather Follow On-Lagrange 1 (SWFO-L1), both of which will provide insight into space weather and its impacts at Earth and across the solar system.
Liftoff of the missions on a SpaceX Falcon 9 rocket is targeted for 7:32 a.m. EDT, Tuesday, Sept. 23, from Launch Complex 39A at NASA’s Kennedy Space Center in Florida. Watch coverage beginning at 6:40 a.m. on NASA+, Amazon Prime, and more. Learn how to watch NASA content through a variety of platforms, including social media.
The IMAP spacecraft will study how the Sun’s energy and particles interact with the heliosphere — an enormous protective bubble of space around our solar system — to enhance our understanding of space weather, cosmic radiation, and their impacts on Earth and human and robotic space explorers. The spacecraft and its two rideshares will orbit approximately one million miles from Earth, positioned toward the Sun at a location known as Lagrange Point 1.
NASA’s Carruthers Geocorona Observatory is a small satellite that will observe Earth’s outermost atmospheric layer, the exosphere. It will image the faint glow of ultraviolet light from this region, called the geocorona, to better understand how space weather impacts our planet. The Carruthers mission continues the legacy of the Apollo era, expanding on measurements first taken during Apollo 16.
The SWFO-L1 spacecraft will monitor space weather and detect solar storms in advance, serving as an early warning beacon for potentially disruptive space weather, helping safeguard Earth’s critical infrastructure and technological-dependent industries. The SWFO-L1 spacecraft is the first NOAA observatory designed specifically for and fully dedicated to continuous, operational space weather observations.
Media accreditation for in-person coverage of this launch has passed. NASA’s media credentialing policy is available online. For questions about media accreditation, please email: ksc-media-accreditat@mail.nasa.gov.
NASA’s mission coverage is as follows (all times Eastern and subject to change based on real-time operations):
Sunday, Sept. 21
2:30 p.m. – NASA Prelaunch News Conference on New Space Weather Missions
Nicky Fox, associate administrator, Science Mission Directorate, NASA Headquarters in Washington Brad Williams, IMAP program executive, NASA Headquarters Irene Parker, deputy assistant administrator for Systems at NOAA’s National Environmental Satellite, Data, and Information Service Denton Gibson, launch director, NASA’s Launch Services Program, NASA Kennedy Julianna Scheiman, director, NASA Science Missions, SpaceX Arlena Moses, launch weather officer, 45th Weather Squadron, U.S. Space Force Watch the briefing on the agency’s website or NASA’s YouTube channel.
Media may ask questions in person or via phone. Limited auditorium space will be available for in-person participation for previously credentialed media. For the dial-in number and passcode, media should contact the NASA Kennedy newsroom no later than one hour before the start of the event at ksc-newsroom@mail.nasa.gov.
3:45 p.m. – NASA, NOAA Science News Conference on New Space Weather Missions
Joe Westlake, director, Heliophysics Division, NASA Headquarters David McComas, IMAP principal investigator, Princeton University Lara Waldrop, Carruthers Geocorona Observatory principal investigator, University of Illinois Urbana-Champaign Jamie Favors, director, Space Weather Program, Heliophysics Division, NASA Headquarters Clinton Wallace, director, NOAA Space Weather Prediction Center James Spann, senior scientist, NOAA Office of Space Weather Observations Watch the briefing on the agency’s website or NASA’s YouTube channel.
Media may ask questions in person and via phone. Limited auditorium space will be available for in-person participation. For the dial-in number and passcode, media should contact the NASA Kennedy newsroom no later than one hour before the start of the event at ksc-newsroom@mail.nasa.gov. Members of the public may ask questions on social media using the hashtag #AskNASA.
Monday, Sept. 22
11:30 a.m. – In-person media one-on-one interviews with the following:
Nicky Fox, associate administrator, Science Mission Directorate, NASA Headquarters Kieran Hegarty, IMAP project manager, Johns Hopkins University Applied Physics Lab Jamie Rankin, IMAP instrument lead for Solar Wind and Pickup Ion, Princeton University John Clarke, Carruthers deputy principal investigator, Boston University Dimitrios Vassiliadis, SWFO-L1 program scientist, NOAA Brent Gordon, deputy director, NOAA Space Weather Prediction Center Remote media may request a one-on-one video interview online by 3 p.m. on Thursday, Sept. 18.
Tuesday, Sept. 23
6:40 a.m. – Launch coverage begins on NASA+, Amazon Prime and more. NASA’s Spanish launch coverage begins on NASA+, and the agency’s Spanish-language YouTube channel.
7:32 a.m. – Launch
Audio-Only Coverage
Audio-only of the launch coverage will be carried on the NASA “V” circuits, which may be accessed by dialing 321-867-1220, or -1240. On launch day, “mission audio,” countdown activities without NASA+ media launch commentary, will be carried on 321-867-7135.
NASA Website Launch Coverage
Launch day coverage of the mission will be available on the agency’s website. Coverage will include links to live streaming and blog updates beginning no earlier than 6 a.m., Sept. 23, as the countdown milestones occur. Streaming video and photos of the launch will be accessible on demand shortly after liftoff. Follow countdown coverage on the IMAP blog.
For questions about countdown coverage, contact the NASA Kennedy newsroom at 321-867-2468.
Para obtener información sobre cobertura en español en el Centro Espacial Kennedy o si desea solicitar entrevistas en español, comuníquese con María-José Viñas: maria-jose.vinasgarcia@nasa.gov.
Attend Launch Virtually
Members of the public can register to attend this launch virtually. NASA’s virtual guest program for this mission also includes curated launch resources, notifications about related opportunities or changes, and a stamp for the NASA virtual guest passport following launch.
Watch, Engage on Social Media
Let people know you’re watching the mission on X, Facebook, and Instagram by following and tagging these accounts:
X: @NASA, @NASAKennedy, @NASASolarSystem, @NOAASatellies
Facebook: NASA, NASA Kennedy, NASA Solar System, NOAA Satellites
Instagram: @NASA, @NASAKennedy, @NASASolarSystem, @NOAASatellites
For more information about these missions, visit:
https://www.nasa.gov/sun
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Abbey Interrante
Headquarters, Washington
301-201-0124
abbey.a.interrante@nasa.gov
Sarah Frazier
Goddard Space Flight Center, Greenbelt, Md.
202-853-7191
sarah.frazier@nasa.gov
Leejay Lockhart
Kennedy Space Center, Fla.
321-747-8310
leejay.lockhart@nasa.gov
John Jones-Bateman
NOAA’s Satellite and Information Service, Silver Spring, Md.
202-242-0929
john.jones-bateman@noaa.gov
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Last Updated Sep 15, 2025 EditorJessica TaveauLocationNASA Headquarters Related Terms
Heliophysics Division Carruthers Geocorona Observatory (GLIDE) Goddard Space Flight Center Heliophysics IMAP (Interstellar Mapping and Acceleration Probe) Kennedy Space Center Science Mission Directorate View the full article
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