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Tag: Satellites

German satellites sense Earth's lumps and bumps

German satellites sense Earth's lumps and bumps

Science
The German space agency (DLR) has released a spectacular 3D map of Earth. Built from images acquired by two radar satellites, it traces the variations in height across all land surfaces - an area totalling more than 148 million sq km. DLR is making the map free and open, enabling any scientist to download and use it. There will be myriad applications, from forecasting where flood waters flow to planning big infrastructure projects. How was the map made?The two satellites involved are called TerraSAR-X and TanDEM-X. Like all radar spacecraft, they send down microwave pulses to the surface of the planet and then time how long the signals take to bounce back. The shorter ...
NASA satellites aid study of relativistic particles

NASA satellites aid study of relativistic particles

Science
May 29 (UPI) -- New data collected by NASA satellites suggest local acceleration explains most of the relativistic particles found in the Van Allen radiation belts circling Earth. After analyzing data collected by NASA's Van Allen Probes and the agency's THEMIS satellites, scientists determined electromagnetic waves called chorus waves are responsible for accelerating particles in the Van Allen belts to relativistic speeds. When recorded, the wave's pattern produces a chirping sound that recalls the chorus of a songbird. According to the new research, the waves steadily push ions and electrons found in the belt into higher and higher speeds. By developing models that better explain the propagation of high-energy particles inside the radiation belts, scientists can better predict space we...
SpaceX's Falcon 9 launches, releases 10 Iridium satellites into orbit

SpaceX's Falcon 9 launches, releases 10 Iridium satellites into orbit

Science
March 30 (UPI) -- SpaceX launched10 Iridium-5 Next satellites from its Falcon 9 rocket Friday at Vandenberg Air Force Base in California.The Falcon 9 blasted off at 10:13 a.m. EDT. The main engine cutoff and stage separation occurred as planned. Eight minutes after the launch, the second stage engine cutoff was confirmed.One hour after liftoff, the 10 satellites were deployed over 15 minutes in a low Earth obit. The 10 satellites are the fifth set SpaceX is launching for Iridium of a planned network of 75 satellites. The launches began in October 2017 and are scheduled to be complete in a few months. Six of the satellites will serve as on-orbit spares.SpaceX didn't attempt to recover Falcon 9's first stage after launch as it has in previous flights, but planned to attempt to catch its fair...
Satellites show warming is accelerating sea level rise

Satellites show warming is accelerating sea level rise

Technology
Melting ice sheets in Greenland and Antarctica are speeding up the already fast pace of sea level rise, new satellite research shows. At the current rate, the world's oceans on average will be at least 2 feet (61 centimeters) higher by the end of the century compared to today, according to researchers who published in Monday's Proceedings of the National Academies of Sciences. Sea level rise is caused by warming of the ocean and melting from glaciers and ice sheets. The research, based on 25 years of satellite data, shows that pace has quickened, mainly from the melting of massive ice sheets. It confirms scientists' computer simulations and is in line with predictions from the United Nations, which releases regular climate change reports. "It's a big deal" because the projected sea level ...

Rocket lights sky as it carries satellites from California

Technology
A reused SpaceX rocket carried 10 satellites into orbit from California on Friday, leaving behind a trail of mystery and wonder as it soared into space. The Falcon 9 booster lifted off from coastal Vandenberg Air Force Base, carrying the latest batch of satellites for Iridium Communications. The launch in the setting sun created a shining, billowing streak that was widely seen throughout Southern California and as far away as Phoenix. Calls came in to TV stations as far afield as San Diego, more than 200 miles south of the launch site. Cars stopped on freeways in Los Angeles so drivers and passengers could take pictures and video. The Los Angeles Fire Department issued an advisory that the "mysterious light in the sky" was from the rocket launch. Jimmy Golen, a sports writer for The Assoc...