The US-German Gravity Recovery and Climate Experiment mission (aka Grace) has taken the last two weeks to produce the most detailed map of the Earth’s gravitational field – lumps and all. Launched in March, the twin spacecraft have been orbiting the planet 16 times a day, 220 km apart from one another. A ground-based microwave ranging system measures the distance between them to see how they speed up and slow down due to changes in gravity. And this is just the low res version; scientists hope to have even more detailed maps by the end of the year.
View of Colorado Fire from Space
Image credit: NASA
A new photo released from NASA’s Terra spacecraft shows the huge swath of destruction caused by the enormous fire in Colorado. The fire started on June 8, and has gone on to destroy more than 40,000 hectares. The image was acquired using Terra’s Advanced Spaceborne Thermal Emission and Reflection Radiometer (Aster), one of five Earth imaging instruments on board the spacecraft. This photo was taken on morning of Sunday, June 16.
Thousands of acres of burned vegetation, along with recent hotspots, are visible in a new image of Colorado’s worst forest fire taken by NASA’s Advanced Spaceborne Thermal Emission and Reflection Radiometer (Aster).
Started on June 8, the Hayman forest fire continues to burn in the Pike National Forest, 57 kilometers (35 miles) south-southwest of Denver, Colo. According to the U.S. Forest Service, the fire has consumed more than 100,000 acres.
The image is available at:
http://www.jpl.nasa.gov/images/earth/usa/west.html.
Acquired Sunday morning, June 16, 2002, the Aster image shows active fires in red. The dark blue area is burned vegetation, and the green areas are healthy vegetation. Clouds are white. The blue cloud at the top center is smoke. The image covers an area of 32.2 by 35.2 kilometers (20 by 21.8 miles).
Aster is one of five Earth-observing instruments launched in December 1999 on NASA’s Terra satellite. With its 14 spectral bands from the visible to the thermal infrared wavelength region and its high spatial resolution of 15 to 90 meters (about 50 to 300 feet), Aster will image Earth for the next six years to map and monitor the planet’s changing surface. Japan’s Ministry of Economy, Trade and Industry built the instrument. NASA’s Jet Propulsion Laboratory, Pasadena, Calif., is responsible for the American portion of the joint U.S./Japan science team that validates and calibrates the instrument and the data products.
Original Source: NASA/JPL News Release
Chinese Dust Disaster Imaged From Space
Image credit: NASA
NASA’s Terra Earth Observing Satellite was on hand this week to record some of the worst dust storms to hit China’s Inner Mongolian and Shanxi Provinces in ten years. The photo on the left shows a relatively clear day, while the one on the right is obscured by a yellowish cloud of dust. Each image was captured by the spacecraft’s Multi-angle Imaging SpectroRadiometer, and represents an area of 380 km x 630 km.
Dust covered northern China earlier this week during some of the worst dust storms to hit the region in a decade. The dust obscuring China’s Inner Mongolian and Shanxi Provinces on March 24 is compared with a relatively clear day (October 31, 2001) in these images from the Multi-angle Imaging SpectroRadiometer’s vertical-viewing (nadir) camera aboard NASA’s Terra Earth Observing Spacecraft. Each image represents an area of about 380 by 630 kilometers (236 by 391 miles).
The images are available at:
http://www.jpl.nasa.gov/images/earth/asia.
In the image from late March, shown on the right, wave patterns in the yellowish cloud liken the storm to an airborne ocean of dust. The veil of particulates obscures features on the surface north of the Yellow River (visible in the lower left). The area shown lies near the edge of the Gobi desert, a few hundred kilometers, or miles, west of Beijing. Dust originates from the desert and travels east across northern China toward the Pacific Ocean. For especially severe storms, fine particles can travel as far as North America.
The Multi-angle Imaging SpectroRadiometer, built and managed by NASA’s Jet Propulsion Laboratory, Pasadena, Calif., is one of five Earth-observing experiments aboard the Terra satellite, launched in December 1999. The instrument acquires images of Earth at nine angles simultaneously, using nine separate cameras pointed forward, downward and backward along its flight path. The change in reflection at different view angles affords the means to distinguish different types of atmospheric particles, cloud forms and land surface covers. More information is available at:
http://www-misr.jpl.nasa.gov.
NASA’s Earth Science Enterprise is a long-term research and technology program designed to examine Earth’s land, oceans, atmosphere, ice and life as a total integrated system.
JPL is a division of the California Institute of Technology in Pasadena.
Original Source: NASA News Release
Envisat Begins Study of Earth’s Environment
The European Space Agency’s recently-launched Envisat began its ten year mission last week to gauge the health of planet Earth. The $2.2 billion, 9 ton satellite successfully turned on all ten of its scientific instruments and took some high-quality images of the break-up of the Larson B ice shelf in Antarctica. Another instrument captured images of photosynthetic plankton near the coast of Mauritania in northwest Africa.
Entire Earth Imaged
NASA has released a new set of photographs which form the most detailed true-colour image of the entire Earth ever created. The photographs are taken at a resolution of 1km and include the land, seas and even clouds and sea ice. Much of the data for this image was gathered by NASA’s Terra satellite, from an altitude of 700km. An additional image shows actual city lights superimposed over a darkened version of the photograph.
Spacecraft Image Volcano Disaster From Orbit
Three NASA spacecraft chronicled the devastation that occurred when the Nyiragongo volcano in Congo erupted on January 17th. The eruption killed more than 100 people and forced hundreds of thousands to evacuate the area. These newly released images were created using data taken from a space shuttle radar mapping mission, Landsat photographs, and the Terra spacecraft.