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For the first time, scientists have used NASA’s IXPE (Imaging X-ray Polarimetry Explorer) to directly measure the magnetic fields of PSR J1101−6101, a pulsar located within what is often referred to as the Lighthouse Nebula. The results provide new insight into the structure of some of the most extreme objects in the cosmos, as NASA continues to explore the secrets of how the universe works. A paper describing the results published Thursday in the Astrophysical Journal.

Fast facts

• A pulsar is a type of neutron star with a strong magnetic field that spins incredibly fast. The pulsar at the center of the Lighthouse Nebula is rotating 16 times per second.
• Neutron stars are the leftover cores of massive stars, formed at the end of their life cycles, that possess more mass than the Sun. They are condensed down to the size of a city, making them natural laboratories for studying extreme physics.

• Polarization is a property of light that describes the direction of its electric field vibrations. The polarization degree is a measurement of how aligned those vibrations are with each other.

In June 2025, IXPE spent nearly 18 days focused on the Lighthouse Nebula.

Astronomers studied two narrow X-ray offshoots extending from the pulsar to better understand how electrons at nearly the speed of light interact with this energetic system. The longer offshoot is known as the “filament,” and the shorter one is the “trail.”

When high-energy particles from the pulsar collide with the gas of interstellar space, they form a bow shock, like the bow wave formed at the front of a speeding boat. Most particles become trapped behind this bow shock, forming the turbulent trail behind the pulsar.

Researchers have suspected since 2008 that the highest-energy particles escape through this bow shock into interstellar space, flowing along the galaxy’s magnetic field lines to create the nebula’s long, thin filament.

“We wanted to test that theory,” said Jack Dinsmore, undergraduate student at Stanford University, who led the study. “The ‘smoking gun’ would come by measuring the polarization of the light, which indicates the magnetic field direction. If the magnetic field points along the filament, that confirms that the filament’s particles are flowing along the field.”

One challenge with these measurements is that the Lighthouse Nebula is relatively faint. To address this, IXPE scientists developed advanced analysis methods that use every bit of data, avoiding simplifying steps that could limit information. With these new tools and the new observations of the Lighthouse, the science team successfully measured the filament’s polarization. These techniques also gave a polarization measurement of the trail, and the pulsar’s emission signal.

Their analysis confirmed with more than 99% confidence that the magnetic field does indeed align with the particles’ flow.

While the parallel direction confirms models for the particle’s motion, the polarization degree was high enough to raise new questions.

“Many of the models for filaments assume strong magnetic turbulence,” said Roger Romani, a Stanford University professor who co-authored this paper. “The high polarization degree we measured indicates lower turbulence than such models require.”

The IXPE observations also showed that the magnetic field responsible for X-ray emission had to be parallel to the trail. However, the authors collected radio frequency observations showing a magnetic field pointing almost exactly perpendicular.

“The striking divergence in magnetic field orientations observed between radio and X-ray wavelengths provides compelling evidence for the highly structured nature of these objects,” said Niccolò Bucciantini of the Italian National Institute for Astrophysics and co-author of the study. “This marks the first clear indication that particles of different energies occupy distinct regions within the system, hinting at the presence of multiple, and potentially very different, acceleration mechanisms at work.”

More about IXPE

The IXPE mission, which continues to provide unprecedented data enabling groundbreaking discoveries about celestial objects across the universe, is a joint NASA and Italian Space Agency mission with partners and science collaborators in 12 countries. It is led by NASA’s Marshall Space Flight Center in Huntsville, Alabama, and BAE Systems, Inc. manages spacecraft operations together with the University of Colorado’s Laboratory for Atmospheric and Space Physics in Boulder. 

Learn more about IXPE’s ongoing mission here: 

https://www.nasa.gov/ixpe

Two new reports from NASA’s Commercial Satellite Data Acquisition (CSDA) program evaluate data from the Umbra X-band Synthetic Aperture Radar (SAR) satellite constellation for the NASA Earth science research and applications community. The results of these evaluations help to inform NASA program management and the user community about the quality of these commercial data for use in NASA science.

The CSDA Umbra Synthetic Aperture Radar Umbra SAR Principal Investigator Evaluation Summary documents the findings of evaluation teams.  The teams  were given access to the Umbra archive as well as the ability to task the Umbra constellation for new acquisitions. The tasking capability allowed evaluation teams to test the utility of Umbra data in time-sensitive workflows and to monitor areas experiencing rapid change and/or emergent environmental conditions, such as harmful algal blooms.

Although the Principal Investigator Evaluation Summary supports the use of Umbra SAR data for NASA Earth science research and applications overall, it noted several strengths and weaknesses of the Umbra X-band data. Strengths included access to a very high spatial resolution X-band SAR satellite constellation; taskable access to high temporal repeat opportunities with quick turnaround; imaging flexibility with a range of azimuth and incidence angles; and the company’s Open Data Program. Conversely, the PI teams reported weaknesses, including issues with Umbra geolocation (noting large and small geolocation errors), limited software compatibility, metadata, and some missing technical documentation.

Additionally, the CSDA Umbra Synthetic Aperture Radar Umbra SAR Quality Assessment Report documents the results of radiometric and geometric analyses performed by NASA subject matter experts (SMEs) enlisted to evaluate the fundamental quality of the Umbra data following the Joint NASA/European Space Agency (ESA) assessment guidelines (ESA-NASA, 2024).

Performed mainly on the single-look complex (SLC) Level 1 data products in Sensor Independent Complex Data (SICD) format, along with some additional Level 2 products used in science usability assessments by the evaluation team, the CSDA SMEs found the spatial resolution of the data agreed with Umbra’s specifications. However, the quality analysis results for geolocation accuracy did not universally align with the company’s specifications. Given these results, the SME’s concluded that “the overall positioning performance of the Umbra data did not meet the expected accuracy.

Regarding the radiometric performance of the data, which was assessed in terms of absolute accuracy, stability, and sensitivity, the SMEs found the data “underperform[ed] relative to that of well-calibrated reference SAR systems.”

About the CSDA Program

The CSDA program was established to identify, evaluate, and acquire data from commercial sources that support the NASA Earth science research and application goals. NASA’s Earth Science Division recognizes the potential impact commercial satellite constellations may have in encouraging/enabling efficient approaches to advancing Earth System Science and applications development for societal benefit. Commercially acquired data may also provide a cost-effective means to augment and/or complement the suite of Earth observations acquired by NASA, other U.S. government agencies, and international partners.

To read the reports in full, see the links under “Evaluation” heading on the CSDA’s Umbra commercial vendor webpage. 

This close-up view shows fragments of sulfur crystals — the first ever seen on the Red Planet. The crystals were found after NASA’s Curiosity Mars rover happened to drive over a rock and crush it on May 30, 2024. Several days later, Curiosity used a camera on the end of its robotic arm to take this image.

A recent paper in Science suggests that the sulfur formed when magma deep below the surface released fluids or gases that deposited sulfur on the Red Planet’s surface about 3 billion years ago.

Image credit: NASA/JPL-Caltech/MSSS

This month, engineers at NASA’s Jet Propulsion Laboratory in Southern California are testing a spacecraft sensor that will help measure how quickly Arctic sea ice is disappearing. And while that instrument won’t launch for another year, scientists started preparing for its use during a recent field campaign in the Canadian wilderness.

Researchers spent two weeks in April flying above the Arctic Ocean, often watching sunrise from an altitude of 1,500 feet (457 meters) in a World War II-era plane. A variety of cutting-edge sensors used to measure the thickness of sea ice and snow were aboard the plane, including a stand-in for the microwave radiometer now undergoing testing at JPL. Measuring sea ice thickness is tricky, requiring a number of precise figures, including how high the sea ice rises above water, the depth of snow on top of that ice, and microwave emissions from the surface.

Flights were timed to the passage of satellites overhead so coordinated observations could be taken of the same features. Combining the airborne and satellite data will improve scientists’ ability to measure sea ice and understand how climate conditions are evolving across the Arctic.

In recent decades, the extent and thickness of Arctic sea ice have changed. Improving measurements of those changes helps scientists better understand the Arctic system while supporting navigation, weather and ocean research, and future satellite observations. As Arctic shipping activity increases, the region is also becoming strategically and economically more significant.

According to Sahra Kacimi of JPL, who served as the field campaign’s science lead, ongoing warming in the Arctic could potentially impact public safety and economic interests.

Frequent flyers

Kacimi has spent years studying sea ice using satellite data, but the top-down view she gets from space is different than peering out a plane’s window.

The bewildering diversity of sea ice creates otherworldly landscapes. The ice can be attached to land or adrift in the ocean; it can be rough or smooth. Driven by winds and ocean currents, the ice is constantly shifting, breaking apart, and deforming. Cracks can open into long stretches of exposed ocean, and collisions between floes can push ice rubble into massive ridges that extend for miles.

Some sea ice lasts only one season, while thicker ice can survive for several years (though multiyear sea ice is becoming less common in many parts of the Arctic). Entire ecosystems are affected by these changes, down to the arctic foxes and hares the scientists spotted throughout the trip.

Improving estimates of sea ice thickness helps scientists better understand how the region is changing and supports long-term observations of the Arctic environment. The NASA team logged about 50 hours in the air over the two-week campaign, conducting flights over drifting ice near the town of Inuvik before studying ice fixed to the shore of another location, a hamlet called Cambridge Bay.

For the Inuvik portion of the campaign, the team coordinated with the Surface Water and Ocean Topography (SWOT) mission, a satellite jointly developed by NASA and the French space agency, CNES (Centre National d’Études Spatiales), with JPL leading the United States component of the mission. Though it was designed to map the height of the globe’s sea and fresh water, SWOT can also measure the amount of sea ice above the waterline.

In Cambridge Bay, the NASA team joined researchers from ESA (European Space Agency), Germany’s Alfred Wegener Institute, and Canada’s University of Calgary. During this part of the campaign, coordinated flights soared over a field camp and under the tracks of satellite missions such as NASA’s Ice, Cloud, and Land Elevation Satellite-2 (ICESat-2) and ESA’s CryoSat-2.

To improve sea ice thickness estimates, ESA is developing, with cooperation from NASA, a new polar mission called Copernicus Polar Ice and Snow Topography Altimeter (CRISTAL). During the April airborne campaign, scientists flew instruments similar to what CRISTAL will carry, including the microwave radiometer now being tested at JPL.

“Combining observations from space, air, and ground surface instruments is essential for developing and validating algorithms for current and future missions,” Kacimi said.

For the scientists, it was also a chance to meet locals who see the Arctic’s changes up close. Kacimi spoke to community leaders and students at a STEM camp about how disappearing ice is affecting their communities.

“I’m used to looking at sea ice from space and thinking about its role in the global climate, but for people living in the Arctic, it carries a much deeper meaning,” Kacimi said.

Media Contacts

Andrew Good
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-2433
andrew.c.good@jpl.nasa.gov

Liz Vlock
NASA Headquarters, Washington
202-358-1600
elizabeth.a.vlock@nasa.gov

2026-043

In early July 2026, for the second time in three months, a powerful typhoon crossed the U.S. Northern Mariana Islands and Guam in the North Pacific Ocean. Super Typhoon Bavi was at peak intensity when it neared the islands on the night of July 5, bringing winds of 290 kilometers (180 miles) per hour, along with torrential rain and dangerous storm surge.

This nighttime image, captured by the VIIRS (Visible Infrared Imaging Radiometer Suite) on the NOAA-20 satellite, shows Bavi’s eye at about 15:30 Universal Time on July 5 (1:30 a.m. local time on July 6). Light from the Moon, which was in the waning gibbous phase, illuminates the eyewall’s western side. The eye passed over Rota, north of Guam, several hours after the image was acquired.

Bavi became a super typhoon in the early hours of July 4 local time while tracking west over the warm ocean. Satellite observations indicated that sea surface temperatures were around 30 degrees Celsius (86 degrees Fahrenheit) in the region. Bavi was the third tropical cyclone in 2026 to reach category 5 intensity on the Saffir-Simpson wind scale.

The typhoon caused extensive damage across Guam, Rota, and Saipan, according to news reports, downing power poles and lines; flooding roads and littering them with debris; and damaging buildings, including a water distribution station on Rota. U.S. Coast Guard crews worked to clear navigation hazards in the waterways around Guam and the Northern Marianas and reopen ports as dangerous marine conditions subsided, according to reports. This damage comes on top of destructive winds and flooding from Super Typhoon Sinlaku, which crossed the islands in mid-April.

On July 8, Bavi remained a powerful typhoon as it moved west over the Philippine Sea. In the early afternoon, when the image above was captured, the National Weather Service reported maximum sustained wind speeds of 250 kilometers (155 miles) per hour. Forecasts indicated the typhoon’s track could bend northwest toward Taiwan, the Ryukyu Islands of southern Japan, and mainland China and weaken over the next several days.

Writing in Yale Climate Connections, meteorologist Jeff Masters said that Bavi is the type of storm that might be expected when a strong El Niño event is building, which is currently the case. El Niño-year typhoons may form farther east, giving them more time over warm water to intensify before curving toward Asia, Masters explained, “resulting in a greater chance of reaching Category 5 intensity.”

NASA Earth Observatory images by Michala Garrison, using data from NASA EOSDIS LANCE, GIBS/Worldview, and the Joint Polar Satellite System (JPSS), and hurricane track data from the U.S. Naval Research Laboratory. Story by Lindsey Doermann.

References & Resources

• CIMSS Satellite Blog (2026, July 3) Super Typhoon Bavi rapidly intensifies to a Category 5 storm east of Guam, eventually passing just north of the island of Rota. Accessed July 8, 2026.
• Military.com (2026, July 7) Coast Guard Works to Reopen Guam, CNMI Ports After Super Typhoon Bavi. Accessed July 8, 2026.
• NASA Earth Observatory (2026, April 14) Super Typhoon Sinlaku. Accessed July 8, 2026.
• National Weather Service (2026, July 8) Public Tropical Cyclone Advisory. Accessed July 8, 2026.
• Weather Underground (2026, July 8) Super Typhoon Bavi. Accessed July 8, 2026.
• Yale Climate Connections (2026, July 3) Super Typhoon Bavi becomes the 3rd Cat 5 of 2026. Accessed July 8, 2026.

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