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Author: A. R. T. Jonkers Publisher: JHU Press ISBN: 9780801871320 Category : History Languages : en Pages : 328
Book Description
Jonkers explores these early efforts both for what they reveal about the history of science and navigation and as a unique record of the actual changes in the Earth's magnetic field. The result, a combination of science and history, will appeal to a broad audience of specialists as well as general readers."--BOOK JACKET.
Author: A. R. T. Jonkers Publisher: JHU Press ISBN: 9780801871320 Category : History Languages : en Pages : 328
Book Description
Jonkers explores these early efforts both for what they reveal about the history of science and navigation and as a unique record of the actual changes in the Earth's magnetic field. The result, a combination of science and history, will appeal to a broad audience of specialists as well as general readers."--BOOK JACKET.
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: 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: Roberto Lanza Publisher: Springer Science & Business Media ISBN: 3540279792 Category : Science Languages : en Pages : 287
Book Description
Initially, this book reviews the general characteristics of the Earth’s magnetic field and the magnetic properties of minerals, and then proceeds to introduce the multifold applications of geomagnetism in earth sciences. The authors analyze the contribution of geomagnetism both in more general geological fields, such as tectonics and geodynamics, and in applied ones, such as prospecting and pollution. Primarily, the book is aimed at undergraduate geology or geophysics students. It is geared to provide them with a general overview of geomagnetism, allowing them to understand what contributions this branch of science can offer in the more special sectors of earth sciences. Graduate students and geology researchers will also benefit from it, as it enables them to gain a clear and concise image of the techniques which can be applied in their areas of specialization.
Author: Ronald T. Merrill Publisher: Academic Press ISBN: 9780124912465 Category : Nature Languages : en Pages : 556
Book Description
Topics involved in studies of the Earth's magnetic field and its secular variation range from the intricate observations of geomagnetism, to worldwide studies of archeomagnetism and paleomagnetism, through to the complex mathematics of dynamo theory. Traditionally these different aspects of geomagnetism have in the main been studied and presented in isolation from each other. This text draws together these lines of inquiry into an integrated framework to highlight the interrelationships and thus to provide a more comprehensive understanding of the geomagnetic field.
Author: J. A. Jacobs Publisher: Cambridge University Press ISBN: 0521450721 Category : Science Languages : en Pages : 357
Book Description
This 1994 book examines how reversals of the Earth's magnetic field have played a major role in establishing plate tectonics and a geological time scale.
Author: Wallace H. Campbell Publisher: Academic Press ISBN: 9780121581640 Category : Science Languages : en Pages : 206
Book Description
An introductory guide to global magnetic field properties, Earth Magnetism addresses, in non-technical prose, many of the frequently asked questions about Earth's magnetic field. Magnetism surrounds and penetrates our Earth in ways basic science courses can rarely address. It affects navigation, communication, and even the growth of crystals. As we observe and experience an 11-year solar maximum, we may witness spectacular satellite-destroying solar storms as they interact with our magnetic field. Written by an acknowledged expert in the field, this book will enrich courses in earth science, atmospheric science, geology, meteorology, geomagnetism, and geophysics. Contains nearly 200 original illustrations and eight pages of full-color plates. * Largely mathematics-free and with a wide breadth of material suitable for general readers * Integrates material from geomagnetism, paleomagnetism, and solar-terrestrial space physics. * Features nearly 200 original illustrations and 4 pages of colour plates
Author: A. R. T. Jonkers
Author: A. R. T. Jonkers
Author: Gillian M. Turner
Author: Sydney Chapman
Author: McElhinny
Author: Dennis Brooks
Author: Roberto Lanza
Author: Ronald T. Merrill
Author: J. A. Jacobs
Author: Keith L. McDonald
Author: Wallace H. Campbell