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Shepherd elected to National Academy of Engineering
February 9, 2021
J. Marshall Shepherd (Photo by Nancy Evelyn/UGA)
Marshall Shepherd, the Georgia Athletic Association Distinguished Professor of Geography and Atmospheric Sciences at the University of Georgia, has been elected to the National Academy of Engineering, one of the highest professional distinctions accorded to an engineer or scientist.
NAE membership honors those who have made outstanding contributions to “engineering research, practice, or education, including, where appropriate, significant contributions to the engineering literature” and to “the pioneering of new and developing fields of technology, making major advancements in traditional fields of engineering, or developing/implementing innovative approaches to engineering education.”
10 Stunning New Ways To Visualize How The Earth Works
Earth’s green-blue visage is awful nice, but we see it so often that we’re sick of it. Luckily, NASA and other space agencies are constantly dreaming up new ways to visualize the countless terrestrial processes we take for granted.
10Earth’s Plasmasphere
The plasmasphere is the inner portion of Earth’s magnetic field, and it’s fabulous. Recently, astronomers have found a constant flux of particles between the two electrically charged regions, forming a terrestrial version of the solar wind.
As solar UV radiation strikes the atmosphere, it kicks off a gigantic ionic rave. Tiny electrons are whipped up and ionize other particles, creating a magnetic stew high above Earth’s surface. The flow is somewhat modest in cosmic terms. It releases only about 1 kilogram (2.2 lb) of charged material into the outer magnetosphere per second. Daily, this adds up to 90 tons of plasma discharge, and this flowing electric material for
ITU
Remote sensing is the collection of information on an object or phenomenon from a distance without any physical contact.
In the context of Earth science, space- or airborne sensors are used for data acquisition and the subject of these observations are the atmosphere or the surface of land and the ocean.
For microwave remote sensing, measurements are made of electromagnetic radiation ranging from below 45 MHz up to a Terahertz or more.
Microwave remote sensing can be either passive or active. Passive sensors gather radiation originating from the particular objects under observation. This radiation can either be emission by the objects themselves or energy coming from the Sun and reflected by these objects.