In mid-May 2015, Ana became the first named tropical storm of the North Atlantic hurricane season. May is early to see large storms in the Atlantic; the season begins in earnest on June 1. But on May 10, Tropical Storm Ana made landfall along the Carolina coast and carried maximum sustained winds of 74 kilometers per hour (46 miles per hour).
Scientists took the opportunity to observe Ana's wind dynamics with the International Space Station-Rapid Scatterometer (ISS-RapidScat). The instrument, which joined NASA's Earth observing fleet in September 2015, measures ocean surface wind speed and direction from orbit on the International Space Station.
An image of Ana's winds was produced at NASA's Goddard Space Flight Center in Greenbelt, Maryland using data acquired by RapidScat as Ana approached the coast on the afternoon of May 8, 2015.
Arrows represent the direction of near-surface winds. Shades of blue indicate the range of wind speeds (lighter blue and green represent faster-moving winds).
RapidScat does not measure storms' wind speed and direction directly. Instead, microwave pulses from the instrument reflect off the ocean surface and back toward the sensor.
Rough waters--those disturbed more by wind--return a stronger signal than smooth waters. From that information, scientists can derive wind speed, as well as its direction based on the position of the waves.
The nature of this measurement method means that RapidScat is describing the winds close to the ocean's surface--useful information for weather forecasting and climate studies.
Higher up in a storm, winds can be even faster. At altitudes above about 500-1,000 meters (1,600-3,300 feet), winds no longer feel the effects of friction from the surface.
For more information: http://earthobservatory.
Rob Gutro | EurekAlert!
Global study of world's beaches shows threat to protected areas
19.07.2018 | NASA/Goddard Space Flight Center
NSF-supported researchers to present new results on hurricanes and other extreme events
19.07.2018 | National Science Foundation
A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.
The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
20.07.2018 | Power and Electrical Engineering
20.07.2018 | Information Technology
20.07.2018 | Materials Sciences