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The Next Age of Earth - A Preview of the Shift
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By NASA
NASA’s Jet Propulsion Laboratory used radar data taken by ESA’s Sentinel-1A satellite before and after the 2015 eruption of the Calbuco volcano in Chile to create this inter-ferogram showing land deformation. The color bands west of the volcano indicate land sinking. NISAR will produce similar images.ESA/NASA/JPL-Caltech A SAR image — like ones NISAR will produce — shows land cover on Mount Okmok on Alaska’s Umnak Island . Created with data taken in August 2011 by NASA’s UAVSAR instrument, it is an example of polarimetry, which measures return waves’ orientation relative to that of transmitted signals.NASA/JPL-Caltech Data from NASA’s Magellan spacecraft, which launched in 1989, was used to create this image of Crater Isabella, a 108-mile-wide (175-kilometer-wide) impact crater on Venus’ surface. NISAR will use the same basic SAR principles to measure properties and characteristics of Earth’s solid surfaces.NASA/JPL-Caltech Set to launch within a few months, NISAR will use a technique called synthetic aperture radar to produce incredibly detailed maps of surface change on our planet.
When NASA and the Indian Space Research Organization’s (ISRO) new Earth satellite NISAR (NASA-ISRO Synthetic Aperture Radar) launches in coming months, it will capture images of Earth’s surface so detailed they will show how much small plots of land and ice are moving, down to fractions of an inch. Imaging nearly all of Earth’s solid surfaces twice every 12 days, it will see the flex of Earth’s crust before and after natural disasters such as earthquakes; it will monitor the motion of glaciers and ice sheets; and it will track ecosystem changes, including forest growth and deforestation.
The mission’s extraordinary capabilities come from the technique noted in its name: synthetic aperture radar, or SAR. Pioneered by NASA for use in space, SAR combines multiple measurements, taken as a radar flies overhead, to sharpen the scene below. It works like conventional radar, which uses microwaves to detect distant surfaces and objects, but steps up the data processing to reveal properties and characteristics at high resolution.
To get such detail without SAR, radar satellites would need antennas too enormous to launch, much less operate. At 39 feet (12 meters) wide when deployed, NISAR’s radar antenna reflector is as wide as a city bus is long. Yet it would have to be 12 miles (19 kilometers) in diameter for the mission’s L-band instrument, using traditional radar techniques, to image pixels of Earth down to 30 feet (10 meters) across.
Synthetic aperture radar “allows us to refine things very accurately,” said Charles Elachi, who led NASA spaceborne SAR missions before serving as director of NASA’s Jet Propulsion Laboratory in Southern California from 2001 to 2016. “The NISAR mission will open a whole new realm to learn about our planet as a dynamic system.”
Data from NASA’s Magellan spacecraft, which launched in 1989, was used to create this image of Crater Isabella, a 108-mile-wide (175-kilometer-wide) impact crater on Venus’ surface. NISAR will use the same basic SAR principles to measure properties and characteristics of Earth’s solid surfaces.NASA/JPL-Caltech How SAR Works
Elachi arrived at JPL in 1971 after graduating from Caltech, joining a group of engineers developing a radar to study Venus’ surface. Then, as now, radar’s allure was simple: It could collect measurements day and night and see through clouds. The team’s work led to the Magellan mission to Venus in 1989 and several NASA space shuttle radar missions.
An orbiting radar operates on the same principles as one tracking planes at an airport. The spaceborne antenna emits microwave pulses toward Earth. When the pulses hit something — a volcanic cone, for example — they scatter. The antenna receives those signals that echo back to the instrument, which measures their strength, change in frequency, how long they took to return, and if they bounced off of multiple surfaces, such as buildings.
This information can help detect the presence of an object or surface, its distance away, and its speed, but the resolution is too low to generate a clear picture. First conceived at Goodyear Aircraft Corp. in 1952, SAR addresses that issue.
“It’s a technique to create high-resolution images from a low-resolution system,” said Paul Rosen, NISAR’s project scientist at JPL.
As the radar travels, its antenna continuously transmits microwaves and receives echoes from the surface. Because the instrument is moving relative to Earth, there are slight changes in frequency in the return signals. Called the Doppler shift, it’s the same effect that causes a siren’s pitch to rise as a fire engine approaches then fall as it departs.
Computer processing of those signals is like a camera lens redirecting and focusing light to produce a sharp photograph. With SAR, the spacecraft’s path forms the “lens,” and the processing adjusts for the Doppler shifts, allowing the echoes to be aggregated into a single, focused image.
Using SAR
One type of SAR-based visualization is an interferogram, a composite of two images taken at separate times that reveals the differences by measuring the change in the delay of echoes. Though they may look like modern art to the untrained eye, the multicolor concentric bands of interferograms show how far land surfaces have moved: The closer the bands, the greater the motion. Seismologists use these visualizations to measure land deformation from earthquakes.
Another type of SAR analysis, called polarimetry, measures the vertical or horizontal orientation of return waves relative to that of transmitted signals. Waves bouncing off linear structures like buildings tend to return in the same orientation, while those bouncing off irregular features, like tree canopies, return in another orientation. By mapping the differences and the strength of the return signals, researchers can identify an area’s land cover, which is useful for studying deforestation and flooding.
Such analyses are examples of ways NISAR will help researchers better understand processes that affect billions of lives.
“This mission packs in a wide range of science toward a common goal of studying our changing planet and the impacts of natural hazards,” said Deepak Putrevu, co-lead of the ISRO science team at the Space Applications Centre in Ahmedabad, India.
Learn more about NISAR at:
https://nisar.jpl.nasa.gov
News Media Contacts
Andrew Wang / Jane J. Lee
Jet Propulsion Laboratory, Pasadena, Calif.
626-379-6874 / 818-354-0307
andrew.wang@jpl.nasa.gov / jane.j.lee@jpl.nasa.gov
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Last Updated Jan 21, 2025 Related Terms
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By European Space Agency
Image: This Copernicus Sentinel-2 image captures the borders between North and South Dakota and Minnesota blanketed with snow and ice. View the full article
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By NASA
NASA On April 21, 1972, NASA astronaut John W. Young, commander of the Apollo 16 mission, took a far-ultraviolet photo of Earth with an ultraviolet camera. Young’s original black-and-white picture was printed on Agfacontour professional film three times, with each exposure recording only one light level. The three light levels were then colored blue (dimmest), green (next brightest), and red (brightest), resulting in the enhanced-color image seen here.
Dr. George Carruthers, a scientist at the Naval Research Laboratory, developed the ultraviolet camera – the first Moon-based observatory – for Apollo 16. Apollo 16 astronauts placed the observatory on the Moon in April 1972, where it sits today on the Moon’s Descartes highland region, in the shadow of the lunar module Orion.
Image credit: NASA
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By NASA
7 min read
Newly Selected Citizen Science Proposals: A Peek at What’s Next
Last year, the NASA citizen science community saw a prize from the White House and two prizes from professional societies: one from the Division of Planetary Sciences and one from the American Astronomical Society. Our teams published two papers in the prestigious journal, Nature, one on a planetary crash and one about a distant world that seems to have auroras. 2024 was a year of 5000 comets, two solar eclipses and plenty of broken records.
But we’re not stopping to rest on our laurels. In 2024, NASA selected 25 new citizen science proposals for funding that will lead to new projects and new results to look forward to in 2025 and beyond. Here’s a roundup of those selections and the principal investigators (PIs) of each team—a sneak peek at what’s coming next in NASA citizen science! Note that these investigations are research grants–some of them will result in new opportunities for the public, others will use results from earlier citizen science projects or develop new tools.
Bright green glow observed from Texas on June 1, 2024, by Stephen Hummel. A new grant to the Spritacular project team will support citizen science research on this newly-discovered phenomenon. Stephen Hummel Citizen Science Seed Funding Program (CSSFP)
The CSSFP aims to support scientists and other experts to develop citizen science projects and to expand the pool of scientists who use citizen science techniques in their science investigations. Four divisions of NASA’s Science Mission Directorate are participating in the CSSFP: the Astrophysics Division, the Biological and Physical Sciences Division, the Heliophysics Division, and the Planetary Science Division. Nine new investigations were recently selected through this program:
Astrophysics Division
SuPerPiG Observing Grid, PI Rachel Huchmala, Boise State University. Use a small telescope to monitor exoplanets to improve our knowledge of their orbits. Understanding the Nature of Clumpy Galaxies with Clump-Scout 2: a New Citizen-Science Project to Characterize Star-Forming Clumps in Nearby Galaxies. PI Claudia Scarlata, University of Minnesota. Label clumps of distant galaxies to help us understand Hubble Space Telescope data. ‘Backyard Worlds: Binaries’ — Discovering Benchmark Brown Dwarfs Through Citizen Science. PI Aaron Meisner, NSF’s NOIRLab. Search for planet-like objects called brown dwarfs that orbit nearby stars. Mobile Toolkits to Enable Transient Follow-up Observations by Amateur Astronomers. PI Michael Coughlin, University of Minnesota. Use your own telescope to observe supernovae, kilonovae and other massive explosions. Planetary Science Division
A Citizen Scientist Approach to High Resolution Geologic Mapping of Intracrater Impact Melt Deposits as an input to Numerical Models, PI Kirby Runyon, Planetary Science Institute. Help map lunar craters so we can better understand how meteor impacts sculpt the moon’s surface. Identifying Active Asteroids in Public Datasets, PI Chad Trujillo, Northern Arizona University, Search for icy, comet-like bodies hiding in the asteroid belt using new data from the Canada-France-Hawaii telescope. Heliophysics Division
Enabling Magnetopause Observations With Informal Researchers (EMPOWR). PI Mo Wenil, Johns Hopkins University. Investigate plasma layers high above the Earth using data from NASA’s Magnetospheric Multiscale (MMS) mission and the Zooniverse platform. High-resolution Ionospheric Imaging using Dual-Frequency Smartphones. PI Josh Semeter, Boston University. Study the upper atmosphere using cell phone signals. Large Scale Structures Originating from the Sun (LASSOS) multi-point catalog: A citizen project connecting operations to research. PI Cecelia Mac Cormack, Catholic University of America. Help build a catalog of structures on the Sun. Comet Identification and Image Annotation Modernization for the Sungrazer Citizen Science Project. PI Oliver Gerland. Search for comets in data from ESA and NASA’s Solar and Heliospheric Observatory (SOHO) mission using new web tools. Heliophysics Citizen Science Investigations (HCSI)
The HCSI program supports medium-scale citizen science projects in the Heliophysics Division of NASA’s Science Mission Directorate. Six investigations were recently selected through this program:
Investigation of green afterglow observed above sprite and gigantic jet tops based on Spritacular project database, PI Burcu Kosar. Photograph electric phenomena above storm clouds to help us understand a newly discovered green glow and learn about atmospheric chemistry. Machine Learning competition for Solar Wind prediction in preparation of solar maximum. PI Enrico Camporeale, University of Colorado, Boulder. Take part in a competition to predict the speed of the solar wind using machine learning. A HamSCI investigation of the bottomside ionosphere during the 2023 annular and 2024 total solar eclipses. PI Gareth Perry, New Jersey Institute of Technology. Use Ham Radio data to investigate the effects of solar eclipses on the ionosphere. Dynamic footprint in mid-latitude mesospheric clouds. PI Chihiko Cullens, University of Colorado, Boulder. Collect and analyze data on noctilucent clouds, rare high-altitude clouds that shine at night. Monitoring Solar Activity During Solar Cycle 25 with the GAVRT Solar Patrol Science and Education Program. PI Marin Anderson, Jet Propulsion Laboratory. Track solar activity during the period leading up to and including solar maximum. What is the total energy input to the heliosphere from solar jets? PI Nour Rawafi, The Johns Hopkins University Applied Physics Laboratory. Identify solar jets in images from the Solar Dynamics Observatory Citizen Science for Earth Systems Program (CSESP)
CSESP opportunities focus on developing and implementing projects that harness contributions from members of the general public to advance our understanding of Earth as a system. Proposals for the 2024 request were required to demonstrate a clear link between citizen science and NASA observation systems to advance the agency’s Earth science mission. Nine projects received funding.
Engaging Citizen Scientists for Inclusive Earth Systems Monitoring, PI Duan Biggs, Northern Arizona University. Measure trees in tropical regions south of the equator with the GLOBE Observer App to improve models of vegetation structure and biomass models from NASA’s Global Ecosystem Dynamics Investigation (GEDI) mission. Integrating Remote Sensing and Citizen Science to Support Conservation of Woodland Vernal Pools, PI Laura Bourgeau-Chavez, Michigan Technological University. Map and monitor shallow, seasonal wetlands in Michigan, Wisconsin and New York to better understand these key habitats of amphibians and other invertebrates. Citizen-Enabled Measurement of PM2.5 and Black Carbon: Addressing Local Inequities and Validating PM Composition from MAIA, Albert Presto/Carnegie Mellon University. Deploy sensors to measure sources of fine airborne particle pollution filling gaps in data from NASA’s Multi-Angle Imager for Aerosols (MAIA) mission. Expanding Citizen Science Hail Observations for Validation of NASA Satellite Algorithms and Understanding of Hail Melt, PI Russ Schumacher, Colorado State University. Measure the sizes and shapes of hailstones, starting in the southeastern United States, using photographs and special pads to help us understand microwave satellite data. X-Snow: A Citizen-Science Proposal for Snow in the New York Area, PI, Marco Tedesco, Columbia University. Measure snow in the Catskill and Adirondacks regions of New York to help improve NASA’s models of snow depth and water content. Coupling Citizen Science and Remote Sensing Observations to Assess the Impacts of Icebergs on Coastal Arctic Ecosystems, PI, Maria Vernet, University of California, San Diego. Measure phytoplankton samples in polar regions to understand how icebergs and their meltwater affect phytoplankton concentration and biodiversity. Forecasting Mosquito-Borne Disease Risk in a Changing Climate: Integrating GLOBE Citizen Science and NASA Earth System Modeling, PI Di Yang, University of Florida, Gainesville. Using data on mosquitoes from the GLOBE Observer App to predict future changes in mosquito-borne disease risk. Ozone Measurements from General Aviation: Supporting TEMPO Satellite Validation and Addressing Air Quality Issues in California’s San Joaquin Valley with Citizen Science, PI Emma Yates, NASA Ames Research Center. Deploy air-quality sensors around Bakersfield, California and compare the data to measurements from NASA’s Tropospheric Emissions Monitoring of Pollution instrument (TEMPO). Under the Canopy: Capturing the Role of Understory Phenology on Animal Communities Using Citizen Science, PI Benjamin Zuckerberg, University of Wisconsin, Madison. Measure snow depth, temperature, and sound in forest understories to improve satellite-based models of vegetation and snow cover for better modeling of wildlife communities. For more information on citizen science awards from previous years, see articles from:
September 2023 August 2022 July 2021 For more information on NASA’s citizen science programs, visit https://science.nasa.gov/citizenscience.
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Last Updated Jan 13, 2025 Related Terms
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By NASA
NASA astronaut Shane Kimbrough and ESA (European Space Agency) astronaut Thomas Pesquet conduct a spacewalk to complete work on the International Space Station on June 25, 2021.Credit: NASA Two NASA astronauts will venture outside the International Space Station, conducting U.S. spacewalk 91 on Thursday, Jan. 16, and U.S. spacewalk 92 on Thursday, Jan. 23, to complete station upgrades.
NASA also will discuss the pair of upcoming spacewalks during a news conference at 2 p.m. EST Friday, Jan. 10, on NASA+ from the agency’s Johnson Space Center in Houston. Learn how to watch NASA content through a variety of platforms, including social media.
Participants in the news conference from NASA Johnson include:
Bill Spetch, operations integration manager Nicole McElroy, spacewalk flight director Media interested in participating in person or by phone must contact the NASA Johnson newsroom no later than 10 a.m. Wednesday, Jan. 8, at: 281-483-5111 or jsccommu@mail.nasa.gov. To ask questions, media must dial in no later than 15 minutes before the start of the news conference. A copy of NASA’s media accreditation policy is online. Questions also may be submitted on social media using #AskNASA.
The first spacewalk is scheduled to begin at 7 a.m. on Jan. 16, and last about six and a half hours. NASA will provide live coverage beginning at 5:30 a.m. on NASA+.
NASA astronauts Nick Hague and Suni Williams will replace a rate gyro assembly that helps provide orientation control for the station, install patches to cover damaged areas of light filters for an X-ray telescope called NICER (Neutron star Interior Composition Explorer), and replace a reflector device used for navigational data on one of the international docking adapters. Additionally, the pair will check access areas and connector tools that will be used for future maintenance work on the Alpha Magnetic Spectrometer.
Hague will serve as spacewalk crew member 1 and will wear a suit with red stripes. Williams will serve as spacewalk crew member 2 and will wear an unmarked suit. This will be the fourth for Hague and the eighth for Williams. It will be the 273rd spacewalk in support of space station assembly, maintenance, and upgrades.
The second spacewalk is scheduled to begin at 7 a.m. on Jan. 23, and last about six and a half hours. NASA will provide live coverage beginning at 5:30 a.m. on NASA+.
Astronauts will remove a radio frequency group antenna assembly from the station’s truss, collect samples of surface material for analysis from the Destiny laboratory and the Quest airlock to see whether microorganisms may exist on the exterior of the orbital complex, and prepare a spare elbow joint for the Canadarm2 robotic arm in the event it is needed for a replacement.
Following completion of U.S. spacewalk 91, NASA will name the participating crew members for U.S. spacewalk 92. It will be the 274th spacewalk in support of space station assembly, maintenance, and upgrades.
Learn more about International Space Station research and operations at:
https://www.nasa.gov/station
-end-
Claire O’Shea
Headquarters, Washington
202-358-1100
claire.a.o’shea@nasa.gov
Sandra Jones
Johnson Space Center, Houston
281-483-5111
sandra.p.jones@nasa.gov
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Last Updated Jan 07, 2025 EditorJessica TaveauLocationNASA Headquarters Related Terms
International Space Station (ISS) Humans in Space Johnson Space Center View the full article
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