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24.03.2015

Sound in the earth, in ear noise generator tinnitus - PDF Review

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If we had ears that could hear radio frequencies, we’d hear the sound of the earth in space. Physicist Craig Kletzing, a professor at the University of Iowa, and his colleagues at NASA recently recorded the clearest example yet of this chorus from the Radiation Belt Storm Probes, a pair of satellites surveying the radiation fields that envelop the Earth.
Most properly functioning sensors return patterns that are pleasing to scientists and gibberish to others, but the Radiation Belt Storm Probes' earliest signals could be music to anyone's ears. Particles throughout the radiation belts are so high energy that they emit waves of electromagnetic radiation.
In the mid-1970s, scientists felt they had a good grasp on the basic physics behind the radiation belts. Kletzing and other space physicists hope the new, paired satellites will provide more information about this variability.
Though forecasting space weather may sound like an esoteric goal, it has become increasingly necessary as we conduct more business in space. Astronauts on manned space missions need to be alerted to changing space weather conditions so they can take shelter in the advent of a radiation storm.
Behind the dazzling display of the aurora borealis are space storms that could turn the lights off here on Earth. Although pioneered by the military, unmanned aircraft could soon become a common part of civilian life. Twin satellites probing the Earth's radiation belts return the clearest recordings yet of a "chorus" of radio waves. Simple life may exist throughout the universe, says paleontologist Peter Ward, but complex life is likely another story.
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NASA engineer Dean Alhorn says that some future spacecraft may be propelled by the sun's rays.
Monorail in Middle Earth Stirs Nature Versus Growth Fight - Bloomberg Business Bloomberg the Company & Products Bloomberg Anywhere Login Bloomberg Connecting decision makers to a dynamic network of information, people and ideas, Bloomberg quickly and accurately delivers business and financial information, news and insight around the world. Just days after the satellites' launch, they were beaming back high-resolution data that matches the quality of CD audio. Kletzing and his colleagues took electromagnetic radiation as recorded by the Electric and Magnetic Field Instrument Suite and Integrated Science sensor, known as EMFISIS for short, and converted the frequencies into sound waves.
They are commonly called the Van Allen belts, named after discoverer James Van Allen, a scientist on the early Explorer and Pioneer missions. The chorus comes from the radio part of the spectrum—specifically between 10 Hz and 10 kHz. Previously, research satellites were sent up singly and were only able report on conditions in their immediate vicinity. It's the part of the mission where scientists and engineers make sure everything is in working order. The closest of these contains a relatively stable number of high-energy protons that are produced when cosmic rays smash into the Earth's atmosphere.


They're not sound waves (there is no sound in space, after all), but because human hearing ranges from 20 Hz to 20 kHz, the chorus's radio emissions can be easily transformed into audio. The twin satellites of the Radiation Belt Storm Probes mission will be able to provide data in stereo, allowing researchers to gather more detailed and more spatially explicit information about the radiation belts. Unlike astronauts, they can't hide from the worst of it, so manufacturers have to plan for a certain amount of wear and tear due to radiation.
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When reproduced as sound instead of radiation, the result is a string of chirps, chatters, whoops, and whistles reminiscent of an extraterrestrial jungle from a sci-fi movie. That involves sending wake-up signals to the satellite, turning on one system after another, and waiting for satisfactory replies as each comes on line. A 1 kHz electromagnetic wave, for example, sounds exactly like the tone of a TV test pattern. Beyond that is another, bigger belt of mostly high-energy electrons, predictably called the outer radiation belt. As successive sensors reply, their signals are recorded and analyzed to make sure they are in working order. Since the Earth's magnetic field is weaker in the outer radiation belt, and because of the irregularity of magnetic storms, its density of particles is more variablity than the inner belt's. In the future, knowing precisely how much radiation a satellite must endure throughout its lifetime could help manufacturers plan replacement schedules better, reducing the need for expensive spares.



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