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Author: Dennis Brooks Publisher: Speedy Publishing LLC ISBN: 168127485X Category : Science Languages : en Pages : 55
Book Description
The Old Theory Until now, there was only one theory regarding the source of Earth's magnetic field, which is the internal dynamo theory. This theory was accepted because it offered the best explanation at the time. Also, much research has been done to support the theory. According to the internal dynamo theory, a dynamo near the center of the planet generates the current that produces the magnetic field. This dynamo would be in the liquid outer core of the planet. It would produce the magnetic axis and project it from the planet. The axis would expand and spread the magnetic field around the planet. This theory also suggests that the internal dynamo is sustaining itself by using fuel from Earth's core. The internal dynamo theory has changed over the years. At first scientists thought that a bar magnet was in the center of the planet and the compass needle pointed to the poles of that magnet. This made perfect sense at the time because we can see that the same thing happens when we put a compass near a bar magnet. The Bar Magnet In The Sun image demonstrates the idea of the bar magnet theory. However, this example shows the bar magnet imbedded within the sun because just like the planets, the sun also has a magnetic field, which is more complex than Earth's magnetic field. Scientists have tried to use the internal dynamo theory to explain the magnetic fields of all the planets, some moons, and the sun. However, the old model does not work for the sun, moon, and other planets. The bar magnet concept lasted a long time as the main theory regarding the source of Earth's magnetic field. However, while trying to apply it to other cases, scientists found problems with the theory. Over the years, they discovered that a bar magnet could not hold magnetism above the temperature of 770 degrees centigrade because high heat destroys magnetism. This caused the theory to gradually evolve over time.
Author: Dennis Brooks Publisher: Speedy Publishing LLC ISBN: 168127485X Category : Science Languages : en Pages : 55
Book Description
The Old Theory Until now, there was only one theory regarding the source of Earth's magnetic field, which is the internal dynamo theory. This theory was accepted because it offered the best explanation at the time. Also, much research has been done to support the theory. According to the internal dynamo theory, a dynamo near the center of the planet generates the current that produces the magnetic field. This dynamo would be in the liquid outer core of the planet. It would produce the magnetic axis and project it from the planet. The axis would expand and spread the magnetic field around the planet. This theory also suggests that the internal dynamo is sustaining itself by using fuel from Earth's core. The internal dynamo theory has changed over the years. At first scientists thought that a bar magnet was in the center of the planet and the compass needle pointed to the poles of that magnet. This made perfect sense at the time because we can see that the same thing happens when we put a compass near a bar magnet. The Bar Magnet In The Sun image demonstrates the idea of the bar magnet theory. However, this example shows the bar magnet imbedded within the sun because just like the planets, the sun also has a magnetic field, which is more complex than Earth's magnetic field. Scientists have tried to use the internal dynamo theory to explain the magnetic fields of all the planets, some moons, and the sun. However, the old model does not work for the sun, moon, and other planets. The bar magnet concept lasted a long time as the main theory regarding the source of Earth's magnetic field. However, while trying to apply it to other cases, scientists found problems with the theory. Over the years, they discovered that a bar magnet could not hold magnetism above the temperature of 770 degrees centigrade because high heat destroys magnetism. This caused the theory to gradually evolve over time.
Author: Dennis Brooks Publisher: ISBN: 9780741401649 Category : Geomagnetism Languages : en Pages : 0
Book Description
Researchers first thought a huge magnet ran through the planet. Next, they thought there was a dynamo in the inner core. Then, they thought a dynamo might exist in the outer core of the planet. Recently, scientists have been studying the dynamo that is found with every planet that has a magnetic field. This research has shown that the outer dynamo system is the source of the magnetic field. The magnetic field of each planet (Earth, Jupiter, Saturn, Uranus, and Neptune) is produced by the ring currents in the radiation belts. Each planet is a component of the dynamo system that produces the magnetic field.
Author: Gillian M. Turner Publisher: The Experiment ISBN: 1615190317 Category : Science Languages : en Pages : 290
Book Description
Discusses the issues of geomagnetism, including why the Earth's magnetic north differs from its geographic north, how animals use geomagnetism for migration purposes, and the source of the magnetic field.
Author: Alanna Mitchell Publisher: Penguin ISBN: 1101985186 Category : Science Languages : en Pages : 342
Book Description
The mystery of Earth's invisible, life-supporting power Alanna Mitchell's globe-trotting history of the science of electromagnetism and the Earth's magnetic field--right up to the latest indications that the North and South Poles may soon reverse, with apocalyptic results--will soon change the way you think about our planet. Award-winning journalist Alanna Mitchell's science storytelling introduce intriguing characters--from the thirteenth-century French investigations into magnetism and the Victorian-era discover that electricity and magnetism emerge from the same fundamental force to the latest research. No one has ever told so eloquently how the Earth itself came to be seen as a magnet, spinning in space with two poles, and that those poles have dramatically reversed many time, often coinciding with mass extinctions. The most recent reversal was 780,000 years ago. Mitchell explores indications that the Earth's magnetic force field is decaying faster than previously thought. When the poles switch, a process that takes many years, the Earth is unprotected from solar radiation storms that would, among other disturbances, wipe out much and possible all of our electromagnetic technology. Navigation for all kinds of animals is disrupted without a stable, magnetic North Pole. But can you imagine no satellites, no Internet, no smartphones--maybe no power grids at all? Alanna Mitchell offers a beautifully crafted narrative history of surprising ideas and science, illuminating invisible parts of our own planet that are constantly changing around us.
Author: Ronald T. Merrill Publisher: University of Chicago Press ISBN: 0226520536 Category : Science Languages : en Pages : 270
Book Description
For the general public, magnetism often seems more the province of new age quacks, movie mad scientists, and grade-school teachers than an area of actual, ongoing scientific inquiry. But as Ronald T. Merrill reveals in Our Magnetic Earth, geomagnetism really is an enduring, vibrant area of science, one that offers answers to some of the biggest questions about our planet’s past—and maybe even its future. In a clear and careful fashion, he lays out the physics of geomagnetism and magnetic fields, then goes on to explain how Earth’s magnetic field provides crucial evidence for our understanding of continental drift and plate tectonics; how and why animals, ranging from bacteria to mammals, sense and use the magnetic field; how changes in climate over eons can be studied through variations in the magnetic field in rocks; and much more. Throughout, Merrill peppers his scientific account with bizarre anecdotes and fascinating details, from levitating pizzas to Moon missions to blackmailing KGB agents—a reminder that real science can at times be stranger, and more amusing, than fiction. A winning primer for anyone who has ever struggled with a compass or admired a ragged V of migrating geese, Our Magnetic Earth demonstrates that education and entertainment need not be polar opposites.
Author: Nguyen Dinh Noan Publisher: Independently Published ISBN: 9781799165644 Category : Science Languages : en Pages : 220
Book Description
Hurry up and get YOUR copy NOW❗ Discovering Secrets about EARTH MAGNETISM: Problems With Electric Charges, On Earth, In Atmosphere, In Van Allen Belt And On The Moon❗ Dear Readers, I study and compile my research results in a book. My purpose is to offer my book for publishing in Singapore and distributing to the world. The book is sorted as Earth Basic Science; semi-empirical research, its title is "Problems With Electric Charges, On Earth, In Atmosphere, In Van Allen Belt And On The Moon." Since 70th years in Marine University, I did battle with the issue of Earth Magnetism, but tens of questions are left behind when I left that school. Such long time of more than 30-year period seems not enough for me to consider the problems of Earth Magnetism, but I do come back with Earth Science and study Earth Magnetism again. Should we begin with "the spinning & magnetism"? This question has been asked for long ago but known to the world since 1915 when Samual J.Barnet (an American scientist) introduced his invent: the Barnet effect. The effect is stated in general: any neutral object (no electric charge on it) spins to induce magnetism. That scientist, the author of his invent applied such theory to explain the origin of Earth Magnetism. He failed or is not accepted. We now begin again with Earth rotation and its magnetism; nonetheless we don't introduce a shock in science, but we do introduce a new view to Earth Magnetism: it spins with electric charges on it cum in the electric field of some others, that's how it is magnetized. Certainly we are at a large gap away from Samual J. Barnet. The gap is not just 102-year interim; it is a view to magnetism in general and Earth Magnetism in my research. The gap is presented in this book with several chapters in 200 pages. I am neither going to deny the settled theories about E.M nor to make the Geomagnetism up-side-down, but consider the E.M as one constituted by 2 major parts: - The "part I" for sea & land: This mainly comprises 2 compositions that induced by the charges at sea surface and land surface, they are both on Earth. The very special paradox is that "land charges versus sea surface charge in contributing to the E.M whilst they both are moving together with Earth's rotation." - The other-external inducers: is one that contributed by external magnetic inducers such as Van Allen belt, Moon and atmosphere. The simple principle governing this part is that the Earth is rotating in electric fields of many charges; that's how the Earth is magnetized. Meantime, in this part I point out that the Moon is charged and its charge induces magnetism to the Earth during orbiting around our planet in a cycle of 29.5 x 24 hrs. Like any other authors, I wish my book to be printed and sold. Unlike some other author, my book is my claim about my discovery. Thank you for your kind attention, Don't delay any more seconds, scroll back up, DOWNLOAD your copy NOW for only $2.99 and start the journey of mastering essential legal terms explained about EARTH MAGNETISM TODAY! Tags: earth magnetism, earths magnetic field, earth magnet, rare earth magnets, big earth magnets, rare earth magnets small, rare earth magnets large, n52 rare earth magnets, raw earth magnets, large earth magnet
Author: Dennis Brooks
Author: Dennis Brooks
Author: Dennis Brooks
Author: Gillian M. Turner
Author: D. Russell Humphreys
Author: Keith L. McDonald
Author: Alanna Mitchell
Author: 
Author: Thomas G. Barnes
Author: Ronald T. Merrill
Author: Nguyen Dinh Noan