The earth's magnetic field
Earth's magnetic field (also known as the geomagnetic field) is the magnetic field that extends from the Earth's interior to where it meets the solar wind, a stream of charged particles emanating from the Sun. Its magnitude at the Earth's surface ranges from 25 to 65 micro Tesla (0.25 to 0.65 Gauss). It is approximately the field of a magnetic dipole tilted at an angle of 10 degrees with respect to the rotational axis—as if there were a bar magnet placed at that angle at the center of the Earth. However, unlike the field of a bar magnet, Earth's field changes over time because it is generated by the motion of molten iron alloys in the Earth's outer core (the geodynamo).
The North Magnetic Pole wanders, but does so slowly enough that an ordinary compass remains useful for navigation. However, at random intervals, which average about several hundred thousand years, the Earth's field reverses, which causes the north and South Magnetic Poles to change places with each other. These reversals of the geomagnetic poles leave a record in rocks that allow paleomagnetists to calculate past motions of continents and ocean floors as a result of plate tectonics.
The region above the ionosphere is called the magnetosphere, and extends several tens of thousands of kilometers into space. This region protects the Earth from cosmic rays that would otherwise strip away the upper atmosphere, including the ozone layer that protects the earth from harmful ultraviolet radiation.

This is an excerpt from the article The earth's magnetic field from the Wikipedia free encyclopedia. A list of authors is available at Wikipedia.
The article The earth's magnetic field at en.wikipedia.org was accessed 62 times in the last 30 days. (as of: 12/10/2013)
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The Earth's Magnetic Field
The Earth has a substantial magnetic field, a fact of some historical importance because of the role of the magnetic compass in exploration of the planet.
csep10.phys.utk.edu/astr161/lect/earth/magnetic.html
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USGS Geomagnetism Program
National Geomagnetism Program, Real-time monitoring of The earth's magnetic field, Data for research and practical application.
geomag.usgs.gov/
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Earth's magnetic field - Wikipedia, the free encyclopedia
Earth's magnetic field (also known as the geomagnetic field) is the magnetic field that extends from the Earth's interior to where it meets the solar wind, a stream ...
en.wikipedia.org/wiki/Earth's_magnetic_field
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Magnetic Field of the Earth - HyperPhysics
The earth's magnetic field is similar to that of a bar magnet tilted 11 degrees from the ... Magnetic fields surround electric currents, so we surmise that circulating ...
hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magearth.html
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HowStuffWorks "Earth's Magnetic Field"
The earth's magnetic field is created by the rotation of its molten core. Read about The earth's magnetic field.
adventure.howstuffworks.com/outdoor-activities/hiking/compass1.htm
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Dogs defecate in accordance with earth's magnetic field, research ...
Jan 8, 2014 ... A scientific study has revealed that dogs adapt their excremental habits to be aligned with the earth's axis.
www.theguardian.com/news/datablog/2014/jan/08/dogs-defecate-earths-magnetic-field-research-finds
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What causes the Earth's magnetic field?| Explore | physics.org
Our planet's magnetic field is believed to be generated deep down in the Earth's core. Nobody has ever taken the mythical journey to the centre of the Earth, but ...
www.physics.org/article-questions.asp?id=64
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Dogs poop in alignment with Earth's magnetic field, study finds | PBS ...
Jan 3, 2014 ... Dogs use The earth's magnetic field when they're relieving themselves. Not only that, but canines choose to do so in a north-south axis, a new ...
www.pbs.org/newshour/rundown/2014/01/dogs-poop-in-alignment-with-earths-magnetic-field-study-finds.html
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Dogs poop in line with Earth's magnetic field, says study | The Raw ...
Jan 2, 2014 ... “Dogs are sensitive to small variations of The earth's magnetic field,” said the research team. “Dogs preferred to excrete with the body being ...
www.rawstory.com/rs/2014/01/02/dogs-poop-in-line-with-earths-magnetic-field-says-study/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+TheRawStory+(The+Raw+Story)
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Dogs poop in line with the Earth's magnetic field | Science! | Geek.com
Jan 5, 2014 ... The Czech researchers were studying what animals have sensitivity to The earth's magnetic field, and decided to test man's best friend.
www.geek.com/science/dogs-poop-relative-to-the-earths-magnetic-field-1581264/
Search results for "The earth's magnetic field"
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The earth's magnetic field in science
The Earth's Magnetic Field
The Earth has a substantial magnetic field, a fact of some historical importance because of the role of the magnetic compass in exploration of the planet.
Magnetic Field of the Earth - HyperPhysics
Magnetic fields surround electric currents, so we surmise that circulating electic currents in the Earth's molten metalic core are the origin of the magnetic field.
Scientists: Dogs poop aligned to Earth's magnetic field
Jan 2, 2014 ... Scientists at the University of Life Sciences in Prague have found that dogs are sensitive to Earth's magnetism. In fact, they're so sensitive that ...
New knowledge about Earth's magical magnetic field - Technical ...
Oct 11, 2013 ... The earth's magnetic field is the shield protecting us against harmful ... For almost two centuries DTU, Technical University of Denmark, has ...
Dogs Align Themselves With The Earth's Magnetic Field When ...
Jan 2, 2014 ... Dogs Align Themselves With The earth's magnetic field When Pooping ... University of Life Sciences in the Czech Republic and the University ...
Hidden Portals in Earth's Magnetic Field | NASA
Jul 2, 2012 ... A NASA-funded researcher at the University of Iowa has figured out how to find X -points, places where the magnetic field of Earth connects to ...
Dogs defecate in accordance with earth's magnetic field, research ...
Jan 8, 2014 ... Dogs defecate in accordance with earth's magnetic field, research finds ... Now, a team of 12 scientists from universities in Germany and the ...
the dynamics of the Earth's core - University of Leeds
Sep 16, 2013 ... “The magnetic field pushes eastwards on the inner core, causing it to spin faster than the Earth, but it also pushes in the opposite direction in ...
Mission to map Earth's magnetic field readies for take-off : Nature ...
Nov 21, 2013 ... Swarm's three probes will circle the Earth to map subtle and ... “Earth's magnetic field is still a bit of a mystery,” he says. .... Uppsala University ...
Dogs Sense Earth's Magnetic Field – News Watch
Jan 3, 2014 ... The team, led by zoologist Hynek Burda of Germany's University of Duisburg- Essen, ... That implies they are sensing The earth's magnetic field.
Books on the term The earth's magnetic field
Reversals of the Earth's Magnetic Field
Reversals of the Earth's Magnetic Field
J. A. Jacobs, 1994
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.
The Pyramid's Mysteries Resolved: Scientific Solutions to Challenges Regarding the Earth Magnetic Field and Climate...
The Pyramid's Mysteries Resolved: Scientific Solutions to Challenges Regarding the Earth Magnetic Field and Climate...
2013
Independent Researcher and Founder of 'Classical Music for Children Foundation' (USA); he is the author of the book "The Power of Musical sound: How Music Affects our State of Mind, Health and Society". He lives in Washington State.
The earth's magnetic field
The earth's magnetic field
Girija Rajaram, P. R. Pisharoty, Colaba-Alibag Observatories of India, 1998
Brought out on the occasion of 150 years of Colaba-Alibag Observatories of India.
The Magnetic Field of the Earth's Lithosphere: The Satellite Perspective
The Magnetic Field of the Earth's Lithosphere: The Satellite Perspective
R. A. Langel, 1998
Many geological features of the Earth's lithosphere create variations in The earth's magnetic field that can be detected by satellites. The resulting magnetic anomaly maps can provide new insights into the tectonic features and broad structures of the lithosphere. This book documents the acquisition, reduction and analysis of satellite ma...
Earth Magnetism: A Guided Tour Through Magnetic Fields
Earth Magnetism: A Guided Tour Through Magnetic Fields
Wallace Hall Campbell, 2001
Written by an acknowledged expert in the field, this book will enrich courses in earth science, atmospheric science, geology, meteorology, geomagnetism, and geophysics.
The Magnetic Field of the Earth: Paleomagnetism, the Core, ...
The Magnetic Field of the Earth: Paleomagnetism, the Core, ...
Ronald T. Merrill, M. W. McElhinny, Phillip L. McFadden, 1998
The text is organized so that paleomagnetists and dynamo theoreticians may both benefit from the results and arguments presented by the other.
The Magnetic Field of the Earth, Volume 63: Paleomagnetism, the Core, and the Deep Mantle (International Geophysics...
The Magnetic Field of the Earth, Volume 63: Paleomagnetism, the Core, and the Deep Mantle (International Geophysics...
Ronald T. Merrill, 1998
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 been studied and presented in isola...
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Blog posts on the term
The earth's magnetic field
Dogs poop in line with the Earth’s magnetic field | Science! | Geek.com
www.geek.com/science/dogs-poop-relative-to-the-earths-magnetic-field-1581264/
Dogs Poop in Alignment with Earth's Magnetic Field | Motherboard
Dog doo north.
motherboard.vice.com/blog/dogs-poop-in-alignment-with-earths-magnetic-field
Dogs poop in line with Earth’s magnetic field, says study | The Raw Story
www.rawstory.com/rs/2014/01/02/dogs-poop-in-line-with-earths-magnetic-field-says-study/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+TheRawStory+(The+Raw+Story)
Dogs defecate in accordance with earth's magnetic field, research finds | News | theguardian.com
A scientific study has revealed that dogs adapt their excremental habits to be aligned with the earth’s axis
www.theguardian.com/news/datablog/2014/jan/08/dogs-defecate-earths-magnetic-field-research-finds
Scientists: Dogs poop aligned to Earth's magnetic field
Scientists at the University of Life Sciences in Prague have found that dogs are sensitive to Earth's magnetism. In fact, they're so sensitive that they poop aligned to the planet's magnetic field. I don't know what that means or why is it useful, but I find it fascinating.
sploid.gizmodo.com/scientists-dogs-poop-aligned-to-earths-magnetic-field-1493113473
Dogs Align Themselves to Earth's Magnetic Field When Pooping - D-brief | DiscoverMagazine.com
Scientists now say dogs align themselves with The earth's magnetic fields before dropping a doody.
blogs.discovermagazine.com/d-brief/2014/01/02/dogs-align-themselves-to-earths-magnetic-field-when-pooping/
Dogs Sense Earth’s Magnetic Field – News Watch
newswatch.nationalgeographic.com/2014/01/03/dogs-sense-earths-magnetic-field/
"Dogs are sensitive to small variations of the Earth's magnetic field" « Statistical Modeling, Causal Inference, and Social Science Statistical Modeling, Causal Inference, and Social Science
andrewgelman.com/2014/01/04/dogs-sensitive-small-variations-earths-magnetic-field/
Do Dogs Poop In Alignment With The Earth’s Magnetic Field? | William M. Briggs
William M. Briggs - Statistician to the Stars!
wmbriggs.com/blog/?p=10931
Frontiers in Zoology | Full text | Dogs are sensitive to small variations of the Earth¿s magnetic field
Several mammalian species spontaneously align their body axis with respect to the Earth’s magnetic field (MF) lines in diverse behavioral contexts. Magnetic alignment is a suitable paradigm to scan for the occurrence of magnetosensitivity across animal taxa with the heuristic potential to contribute to the understanding of the mechanism of magnetoreception and identify further functions of magnetosensation apart from navigation. With this in mind we searched for signs of magnetic alignment in dogs. We measured the direction of the body axis in 70 dogs of 37 breeds during defecation (1,893 observations) and urination (5,582 observations) over a two-year period. After complete sampling, we sorted the data according to the geomagnetic conditions prevailing during the respective sampling periods. Relative declination and intensity changes of the MF during the respective dog walks were calculated from daily magnetograms. Directional preferences of dogs under different MF conditions were analyzed and tested by means of circular statistics.
www.frontiersinzoology.com/content/10/1/80
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