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Author : McElhinny
Publisher : Academic Press
Page : 400 pages
File Size : 43,8 Mb
Release : 1984-01-04
Category : Science
ISBN : 9780080954639
The Earth's Magnetic Field : Its History, Origin, and Planetary Perspective
Author : Ronald T. Merrill,M. W. McElhinny
Publisher : Unknown
Page : 401 pages
File Size : 50,9 Mb
Release : 1983-01-01
Category : Technology & Engineering
ISBN : 0124912427
Author : R. A. Langel,W. J. Hinze
Publisher : Cambridge University Press
Page : 444 pages
File Size : 48,9 Mb
Release : 1998-07-13
Category : Science
ISBN : 0521473330
This 1998 book documents the collection, processing and analysis of satellite magnetic field data.
Author : Dennis Brooks
Publisher : Speedy Publishing LLC
Page : 68 pages
File Size : 44,7 Mb
Release : 2015-03-04
Category : Science
ISBN : 9781681274850
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 : Thomas G. Barnes
Publisher : Unknown
Page : 154 pages
File Size : 52,7 Mb
Release : 1973
Category : Science
ISBN : MINN:31951000536548I
Author : M. Mandea,Monika Korte
Publisher : Springer Science & Business Media
Page : 344 pages
File Size : 43,5 Mb
Release : 2010-12-10
Category : Science
ISBN : 9789048198580
This volume provides comprehensive and authoritative coverage of all the main areas linked to geomagnetic field observation, from instrumentation to methodology, on ground or near-Earth. Efforts are also focused on a 21st century e-Science approach to open access to all geomagnetic data, but also to the data preservation, data discovery, data rescue, and capacity building. Finally, modeling magnetic fields with different internal origins, with their variation in space and time, is an attempt to draw together into one place the traditional work in producing models as IGRF or describing the magnetic anomalies.
Author : Keith L. McDonald
Publisher : Unknown
Page : 100 pages
File Size : 42,9 Mb
Release : 1967
Category : Cosmic magnetic fields
ISBN : PSU:000072017364
Author : Wallace H. Campbell
Publisher : Academic Press
Page : 206 pages
File Size : 53,7 Mb
Release : 2001-01-19
Category : Science
ISBN : 0121581640
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 : David W. Strangway
Publisher : Unknown
Page : 184 pages
File Size : 40,6 Mb
Release : 1970
Category : Paleomagnetism
ISBN : MINN:31951000516297T
Author : Keith L. McDonald,Robert H. Gunst
Publisher : Unknown
Page : 108 pages
File Size : 43,6 Mb
Release : 1967
Category : Geomagnetism
ISBN : UCSD:31822007470818
Author : J. A. Jacobs
Publisher : Cambridge University Press
Page : 357 pages
File Size : 41,6 Mb
Release : 1994-11-24
Category : Science
ISBN : 9780521450720
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 : Ronald T. Merrill,M. W. McElhinny,Phillip L. McFadden
Publisher : Academic Press
Page : 556 pages
File Size : 43,9 Mb
Release : 1998
Category : Nature
ISBN : 012491246X
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 : Ronald T. Merrill
Publisher : University of Chicago Press
Page : 270 pages
File Size : 52,5 Mb
Release : 2010-11-15
Category : Science
ISBN : 9780226520506
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 : Stephen G. Brush
Publisher : Cambridge University Press
Page : 344 pages
File Size : 51,5 Mb
Release : 1996-04-26
Category : Science
ISBN : 0521441714
Nebulous Earth follows the development of the nineteenth-century's most popular explanation for the origin of the solar system, Laplace's Nebular Hypothesis.
Author : Joseph L. Kirschvink,Douglas S. Jones,Bruce J. MacFadden
Publisher : Springer Science & Business Media
Page : 679 pages
File Size : 46,5 Mb
Release : 2013-04-17
Category : Science
ISBN : 9781461303138
The mystery of how migrating animals find their way over unfamiliar terrain has intrigued people for centuries, and has been the focus of productive research in the biological sci ences for several decades. Whether or not the earth's magnetic field had anything to do with their navigational abilities has sufaced and been dismissed several times, beginning at least in the mid to late 1800s. This topic generally remained out of the mainstream of scientific research for two reasons: (1) The apparent irreproducibility of many of the be havioral experiments which were supposed to demonstrate the existence of the magnetic sense; and (2) Perceived theoretical difficulties which were encountered when biophysi cists tried to understand how such a sensory system might operate. However, during the mid to late 1960s as the science of ethology (animal behavior) grew, it became clear from studies on bees and birds that the geomagnetic field is used under a variety of conditions. As more and more organisms were found to have similar abilities, the problem shifted back to the question as to the basis of this perception. Of the various schemes for trans ducing the geomagnetic field to the nervous system which have been proposed, the hy pothesis of magnetite-based magnetoreception discussed at length in this volume has per haps the best potential for explaining a wide range of these effects, even though this link is as yet clear only in the case of magnetotactic bacteria.
