{{redirect|Magnetic North}} {{redirect|Project Polaris|other programs and projects|Polaris (disambiguation)}} {{short description|Earth's magnetic pole in the Northern Hemisphere}} thumb|Location of the north magnetic pole and the north geomagnetic pole in 2017.<ref>{{Cite web|url=http://wdc.kugi.kyoto-u.ac.jp/poles/polesexp.html|title=Magnetic North, Geomagnetic and Magnetic Poles|website=wdc.kugi.kyoto-u.ac.jp|access-date=2019-12-18}}</ref> The magnetic-north of the earth as a magnet is actually on the southern hemisphere: The north side of magnets are by definition attracted to the magnetic south pole (which is the one in the geographic north), and opposite poles attract.
The '''north magnetic pole''', also known as the '''magnetic north pole''', is a point on the surface of Earth's Northern Hemisphere at which the planet's magnetic field points vertically downward (in other words, if a magnetic compass needle is allowed to rotate in three dimensions, it will point straight down). There is only one location where this occurs, near (but distinct from) the geographic north pole. The Earth's magnetic north pole is actually considered the "south pole" in terms of a typical magnet, meaning that the north pole of a magnet would be attracted to the Earth's magnetic north pole.<ref>{{cite web | url=https://www.wtamu.edu/~cbaird/sq/mobile/2013/11/15/why-does-a-magnetic-compass-point-to-the-geographic-north-pole/#:~:text=Furthermore%2C%20the%20magnetic%20pole%20near,to%20the%20geographic%20north%20pole | title=Why does a magnetic compass point to the Geographic North Pole? }}</ref>
The north magnetic pole moves over time according to magnetic changes and flux lobe elongation<ref>{{cite journal|last1=Livermore|first1=Philip W.|last2=Finlay|first2=Christopher C.|last3=Bayliff|first3=Matthew|year=2020|title=Recent north magnetic pole acceleration towards Siberia caused by flux lobe elongation|url=https://doi.org/10.1038/s41561-020-0570-9|journal=Nature Geoscience|volume=13|issue=5|pages=387–391|doi=10.1038/s41561-020-0570-9|s2cid=218513160|archive-url=https://web.archive.org/web/20200614014120/https://www.nature.com/articles/s41561-020-0570-9|archive-date=14 June 2020|arxiv=2010.11033|bibcode=2020NatGe..13..387L}} [http://eprints.whiterose.ac.uk/160366/ Alt URL]</ref> in the Earth's outer core.<ref>{{cite book|last1=Merrill|first1= Ronald T.|last2=McElhinny|first2=Michael W.|last3=McFadden|first3=Phillip L.|title=The magnetic field of the earth: paleomagnetism, the core, and the deep mantle|publisher=Academic Press|year=1996|isbn=978-0-12-491246-5|chapter=Chapter 8}}</ref> In 2001, it was determined by the Geological Survey of Canada to lie west of Ellesmere Island in northern Canada at {{Coord|81|18|N|110|48|W|type:landmark_region:CA-NU|name=Magnetic North Pole 2001}}.<ref name="NG change">{{cite web|url=https://www.nationalgeographic.com/science/2019/02/magnetic-north-update-navigation-maps/|archive-url=https://web.archive.org/web/20190204231652/https://www.nationalgeographic.com/science/2019/02/magnetic-north-update-navigation-maps/|url-status=dead|archive-date=4 February 2019|title=Magnetic north just changed. Here's what that means.|first=Maya |last=Wei-Haas|date=4 February 2019|work=National Geographic|department=Science & Innovation|access-date=5 February 2019}}</ref> It was situated at {{Coord|83|06|N|117|48|W|type:landmark_region:CA-NU|name=Magnetic North Pole 2005 est}} in 2005. In 2009, while still situated within the Canadian Arctic at {{Coord|84|54|N|131|00|W|type:landmark_region:CA-NU|name=Magnetic North Pole 2009}},<ref name="WDCG-Kyoto">{{cite web|url=http://wdc.kugi.kyoto-u.ac.jp/poles/polesexp.html|title=Magnetic North, Geomagnetic and Magnetic Poles|author=World Data Center for Geomagnetism, Kyoto|access-date=2012-07-03}}</ref> it was moving toward Russia at between {{Convert|34|and|37|mi|abbr=on|order=flip}} per year.<ref>[https://web.archive.org/web/20091228073445/http://news.nationalgeographic.com/news/2009/12/091224-north-pole-magnetic-russia-earth-core.html North Magnetic Pole Moving East Due to Core Flux], National Geographic, 24 December 2009</ref> In 2013, the distance between the north magnetic pole and the geographic north pole was approximately {{convert|800|km|mi}}.<ref>{{cite book |url=https://books.google.com/books?id=YBbTBwAAQBAJ |first=Aleksandr |last=Petrovich Dubrov |title=The Geomagnetic Field and Life |page=12 |date=2013-11-11 |language=en |publisher=Springer US |isbn=9781475716108}}</ref> As of 2021, the pole is projected to have moved beyond the Canadian Arctic to {{Coord|86.400|N|156.786|E|name=Magnetic North Pole 2021 est}}.<ref>[https://www.ngdc.noaa.gov/geomag/data/poles/NP.xy NP.xy]</ref><ref name="WDCG-Kyoto"/>
Its southern hemisphere counterpart is the south magnetic pole. Since Earth's magnetic field is not exactly symmetric, the north and south magnetic poles are not antipodal, meaning that a straight line drawn from one to the other does not pass through the geometric center of Earth.
Earth's north and south magnetic poles are also known as ''magnetic dip poles'', with reference to the vertical "dip" of the magnetic field lines at those points.<ref>{{cite web|url=http://deeptow.whoi.edu/northpole.html|title=The Magnetic North Pole|publisher=Woods Hole Oceanographic Institution|work=Ocean bottom magnetology laboratory|access-date=2017-02-06|archive-url=https://web.archive.org/web/20130819061122/http://deeptow.whoi.edu/northpole.html|archive-date=2013-08-19|url-status=dead}}</ref>
{| class="wikitable" |- |+Recent locations of Earth's magnetic (dip) poles, IGRF-13 estimate<ref name=NGDC_WAND/> |- !scope=row|Year !1990 (definitive) !2000 (definitive) !2010 (definitive) !2020 |- !scope=row|North magnetic pole |{{coord|78.095|N|103.689|W|scale:10000000|name=NMP 1990}} |{{coord|80.972|N|109.640|W|scale:10000000|name=NMP 2000}} |{{coord|85.020|N|132.834|W|scale:10000000|name=NMP 2010}} |{{coord|86.494|N|162.867|E|scale:10000000|name=NMP 2020|display=inline,title}} |- !scope=row|South magnetic pole |{{coord|64.910|S|138.902|E|scale:10000000|name=SMP 1990}} |{{coord|64.661|S|138.303|E|scale:10000000|name=SMP 2000}} |{{coord|64.432|S|137.325|E|scale:10000000|name=SMP 2010}} |{{coord|64.081|S|135.866|E|scale:10000000|name=SMP 2020}} |}
==Polarity== <!-- The "North Pole" of a magnet is the pole that points north. Therefore, the Earth's "north magnetic pole" is physically a magnetic SOUTH pole. These claims are supported by the references given. PLEASE DO NOT CHANGE THIS TO SAY SOMETHING ELSE WITHOUT VERY GOOD EVIDENCE. -->
All magnets have two poles, where lines of magnetic flux enter one pole and emerge from the other pole. By analogy with Earth's magnetic field, these are called the magnet's "north" and "south" poles. Before magnetism was well understood, the north-seeking pole of a magnet was defined to have the north designation, according to their use in early compasses. However, opposite poles attract, which means that as a physical magnet, the magnetic north pole of the Earth is actually on the southern hemisphere.<ref>{{cite book |last = Serway |first = Raymond A. |author2 = Chris Vuille |title = Essentials of college physics |publisher = Cengage Learning |year = 2006 |location = US |page = 493 |url = https://books.google.com/books?id=8n4NCyRgUMEC&pg=PA493 |isbn = 0-495-10619-4 |access-date = 2012-04-19 |archive-date = 2019-05-15 |archive-url = https://web.archive.org/web/20190515022230/https://books.google.com/books?id=8n4NCyRgUMEC&pg=PA493 |url-status = dead }}</ref><ref>{{cite web|url=http://www.windows2universe.org/earth/Magnetosphere/earth_magnetic_poles.html |title=Earth's Magnetic Poles |work=Windows to the Universe |first=Randy |last=Russell |publisher=National Earth Science Teachers Association |access-date=2012-04-19}}</ref> In other words, if we establish that true geographic north is north, then what we call the Earth's north magnetic pole is actually its south magnetic pole since it attracts the north magnetic pole of other magnets, such as compass needles.
The direction of magnetic field lines is defined such that the lines emerge from the magnet's north pole and enter into the magnet's south pole.
==History== [[File:Starkad.jpg|thumb|upright=1.6|Part of the Carta marina of 1539 by Olaus Magnus, depicting the location of magnetic north vaguely conceived as "Insula Magnetū[m]" (Latin for "Island of Magnets"), off modern-day Murmansk. The man holding the rune staffs is the Norse hero Starkad ("Starcaterus").]]
Early European navigators, cartographers and scientists believed that compass needles were attracted to a hypothetical "magnetic island" somewhere in the far north (see Rupes Nigra), or to Polaris, the pole star.<ref name="NatResCan">[https://web.archive.org/web/20100112152718/http://gsc.nrcan.gc.ca/geomag/nmp/early_nmp_e.php Early Concept of the North Magnetic Pole], Natural Resources Canada, retrieved June 2007</ref> The idea that Earth itself acts as essentially a giant magnet was first proposed in 1600, by the English physician and natural philosopher William Gilbert. He was also the first to define the north magnetic pole as the point where Earth's magnetic field points vertically downwards. This is the current definition, though it would be a few hundred years before the nature of Earth's magnetic field was understood with modern accuracy and precision.<ref name="NatResCan"/>
==Expeditions and measurements== {{See also|Arctic exploration|Farthest North|List of Arctic expeditions}}
===First observations=== The first group to reach the north magnetic pole was led by James Clark Ross, who found it at Cape Adelaide on the Boothia Peninsula on 1 June 1831, while serving on the second arctic expedition of his uncle, Sir John Ross. Roald Amundsen found the north magnetic pole in a slightly different location in 1903. The third observation was by Canadian government scientists Paul Serson and Jack Clark, of the Dominion Astrophysical Observatory, who found the pole at Allen Lake on Prince of Wales Island in 1947.<ref>[https://web.archive.org/web/20100827062222/http://gsc.nrcan.gc.ca/geomag/nmp/expeditions_e.php History of Expeditions to the North Magnetic Pole], Natural Resources Canada</ref>
===Project Polaris=== At the start of the Cold War, the United States Department of War recognized a need for a comprehensive survey of the North American Arctic and asked the United States Army to undertake the task. An assignment was made in 1946 for the Army Air Forces' recently formed Strategic Air Command to explore the entire Arctic Ocean area. The exploration was conducted by the 46th (later re-designated the 72nd) Photo Reconnaissance Squadron and reported on as a classified ''Top Secret'' mission named Project Nanook. This project in turn was divided into many separate, but identically classified, projects, one of which was Project Polaris, which was a radar, photographic (trimetrogon, or three-angle, cameras) and visual study of the entire Canadian Archipelago. A Canadian officer observer was assigned to accompany each flight.
Frank O. Klein, the director of the project, noticed that the fluxgate compass did not behave as erratically as expected—it oscillated no more than 1 to 2 degrees over much of the region—and began to study northern terrestrial magnetism.<ref name=White>{{cite book|last=White |first=Ken|title=World in Peril: The Origin, Mission & Scientific Findings of the 46th / 72nd Reconnaissance Squadron |year=1994|publisher=K. W. White & Associates|edition = 2nd revised |isbn=978-1883218102 }}</ref><ref name=Wack>{{cite book|author=Wack, Fred John |title=The Secret Explorers: Saga of the 46th/72nd Reconnaissance Squadrons |publisher=Seeger's Print |year=1992}}</ref> With the cooperation of many of his squadron teammates in obtaining many hundreds of statistical readings, startling results were revealed: The center of the north magnetic dip pole was on Prince of Wales Island some {{convert|250|mi|abbr=on|order=flip}} NNW of the positions determined by Amundsen and Ross, and the dip pole was not a point but occupied an elliptical region with foci about {{convert|250|mi|order=flip|abbr=on}} apart on Boothia Peninsula and Bathurst Island. Klein called the two foci local poles, for their importance to navigation in emergencies when using a "homing" procedure.{{clarify | reason = Does 'foci' mean foci of the aforementioned ellipse? Why are the foci important?|date=February 2014}} About three months after Klein's findings were officially reported, a Canadian ground expedition was sent into the Archipelago to locate the position of the magnetic pole. R. Glenn Madill, Chief of Terrestrial Magnetism, Department of Mines and Resources, Canada, wrote to Lt. Klein on 21 July 1948:
{{Quote|… we agree on one point and that is the presence of what we can call the main magnetic pole on northwestern Prince of Wales Island. I have accepted as a purely preliminary value the position latitude 73°N and longitude 100°W. Your value of 73°15'N and 99°45’W is in excellent agreement, and I suggest that you use your value by all means.|R. Glenn Madill<ref name=White />}} (The positions were less than {{convert|20|mi|km|sigfig=1|order=flip|abbr=on}} apart.)
===Modern (post-1996)=== {{multiple image | direction = vertical | width = 220 | image1 = Magnetic North Pole Positions 2025.svg | caption1 = The movement of Earth's north magnetic pole across the North Pole in recent centuries, continuing in recent years across the Arctic Ocean towards Siberia | image2 = North Magnetic Pole Speed.svg | caption2 = Speed of the north magnetic pole drift according to the IGRF-12 model }} The Canadian government has made several measurements since, which show that the north magnetic pole is moving continually northwestward. In 2001, an expedition located the pole at {{Coord|81|18|N|110|48|W|type:landmark_region:CA-NU|name=Magnetic North Pole 2001}}.
In 2007, the latest survey found the pole at {{Coord|83|57|00|N|120|43|12|W|type:landmark_region:CA-NU|name=Magnetic North Pole 2007 location}}.<ref name="newitt2007">L. R. Newitt, A. Chulliat, and J.-J. Orgeval, [http://www.terrapub.co.jp/journals/EPS/pdf/2009/6106/61060703.pdf Location of the north magnetic pole in April 2007], Earth Planets Space, 61, 703–710, 2009</ref> During the 20th century it moved {{convert|1100|km|abbr=on}}, and since 1970 its rate of motion has accelerated from {{convert|9|to|52|km|abbr=on}} per year (2001–2007 average; see also polar drift). Members of the 2007 expedition to locate the magnetic north pole wrote that such expeditions have become logistically difficult, as the pole moves farther away from inhabited locations. They expect that in the future, the magnetic pole position will be obtained from satellite data instead of ground surveys.<ref name="newitt2007"/>
This general movement is in addition to a daily or ''diurnal'' variation in which the north magnetic pole describes a rough ellipse, with a maximum deviation of {{convert|80|km|abbr=on}} from its mean position.<ref>[https://web.archive.org/web/20100625061648/http://gsc.nrcan.gc.ca/geomag/nmp/daily_mvt_nmp_e.php Geomagnetism – Daily Movement of the North Magnetic Pole], Natural Resources Canada</ref> This effect is due to disturbances of the geomagnetic field by charged particles from the Sun.
As of early 2019, the magnetic north pole is moving from Canada towards Siberia at a rate of approximately {{convert|55|km|abbr=on}} per year.<ref>{{cite web|url=https://www.theguardian.com/world/2019/feb/05/magnetic-north-pole-moving-pretty-fast-towards-russia|title=Polar express: magnetic north pole moving 'pretty fast' towards Russia|publisher=Associated Press|date=5 February 2019|via=theguardian.com}}</ref>
NOAA gives the 2024 location of the magnetic north pole as 86 degrees North, 142 degrees East. By 2025, it is predicted that it will have drifted to 138 degrees East (same latitude).<ref>{{cite web|url=https://www.ncei.noaa.gov/products/wandering-geomagnetic-poles|title=Wandering of the Geomagnetic Poles|date=10 March 2022 |publisher=NOAA}}</ref>{{update needed|reason=And did it?|date=June 2025}}
====Exploration==== The first team of novices to reach the magnetic north pole did so in 1996, led by David Hempleman-Adams. It included the first British woman Sue Stockdale and first Swedish woman to reach the Pole.<ref>{{cite web|last=Smith|first=Anna|title=Scot of the Arctic; Sue conquers the North Pole.|url=http://www.highbeam.com/doc/1G1-61263656.html|archive-url=https://web.archive.org/web/20140611030006/http://www.highbeam.com/doc/1G1-61263656.html|url-status=dead|archive-date=11 June 2014|publisher=Daily Record|access-date=29 January 2014}}</ref><ref>{{cite news|url= http://news.bbc.co.uk/2/hi/85916.stm |title= North Pole party for 'Grand Slam' Briton |access-date=12 June 2008 | date=30 April 1998 | work=BBC News}}</ref><ref>{{cite web|last=Smith|first=Anna|title=I have to do this not just for me … but for Scotland; Pole star: Sue's going where no Scotswoman has gone before|url=http://www.thefreelibrary.com/I+have+to+do+this+not+just+for+me+..+but+for+Scotland%3B+Pole+star%3A...-a061265201|publisher=Daily Record|access-date=29 January 2014}}</ref> The team also successfully tracked the location of the Magnetic North Pole on behalf of the University of Ottawa, and certified its location by magnetometer and theodolite at {{Coord|78|35|42|N|104|11|54|W|type:landmark_region:CA-NU|name=Magnetic North Pole 1996}}.<ref>[https://web.archive.org/web/20080513074336/http://polarrace.com/gallery/articles/1996_magnetic_north_pole/ 1996 Certified Position of the Magnetic North Pole], Jock Wishart, Polar Race organiser</ref><ref>{{Cite web |url=https://virtualglobetrotting.com/map/magnetic-north-pole-location-1996/view/google/ |title=Magnetic North Pole Location, 1996 in Ellef Ringnes Island, Canada |last=Wishart |first=Jock |access-date=21 July 2019 |work=Virtualglobetrotting|date=13 July 2006 }}</ref>
The Polar Race was a biannual competition that ran from 2003 until 2011. It took place between the community of Resolute, on the shores of Resolute Bay, Nunavut, in northern Canada and the 1996 location of the north magnetic pole at {{Coord|78|35|42|N|104|11|54|W|type:landmark_region:CA-NU|name=Magnetic North Pole 1996}}, also in northern Canada.
On 25 July 2007, the ''Top Gear: Polar Special'' was broadcast on BBC Two in the United Kingdom, in which Jeremy Clarkson, James May, and their support and camera team claimed to be the first people in history to reach the 1996 location of the north magnetic pole in northern Canada by car.<ref>{{cite episode |url=http://www.bbc.co.uk/programmes/b007v18p |title=Polar Challenge |series=Top Gear |network=BBC Two |airdate= 25 July 2007 |minutes=0:22 |access-date=19 April 2012}}</ref>{{Better source|date=December 2019|reason=A TV show is not a reliable source, especially not about their own accomplishments.}} Note that they did not reach the actual north magnetic pole, which at the time (2007) had moved several hundred kilometers further north from the 1996 position.<ref name=NGDC_WAND>{{Cite web|url=https://www.ncei.noaa.gov/products/wandering-geomagnetic-poles|title=Wandering of the Geomagnetic Poles {{!}} NCEI|last=Nair|first=Manoj C.|website=ngdc.noaa.gov|language=EN-US|access-date=2019-12-19}}</ref>{{not in source|date=August 2023}}
==Magnetic north and magnetic declination== {{main|Magnetic declination}} thumb|Magnetic declination from true north in 2000. Historically, the magnetic compass was an important tool for navigation. While it has been widely replaced by Global Positioning Systems, many airplanes and ships still carry them, as do casual boaters and hikers.<ref>{{cite web |title=Compass |url=https://education.nationalgeographic.org/resource/compass/ |website=National Geographic Society |access-date=25 August 2018 |language=en |date=3 December 2013}}</ref>
The direction in which a compass needle points is known as magnetic north. In general, this is not exactly the direction of the north magnetic pole (or of any other consistent location). Instead, the compass aligns itself to the local geomagnetic field, which varies in a complex manner over Earth's surface, as well as over time. The local angular difference between magnetic north and true north is called the magnetic declination. Most map coordinate systems are based on true north, and magnetic declination is often shown on map legends so that the direction of true north can be determined from north as indicated by a compass.<ref>{{cite web |title=Magnetic declination |url=http://www.geomag.nrcan.gc.ca/mag_fld/magdec-en.php |website=Natural Resources Canada |publisher=Government of Canada |access-date=25 August 2018 |language=en}}</ref>
In North America the line of zero declination (the ''agonic line'') runs from the north magnetic pole down through Lake Superior and southward into the Gulf of Mexico (see figure). Along this line, true north is the same as magnetic north. West of the agonic line a compass will give a reading that is east of true north and by convention the magnetic declination is positive. Conversely, east of the agonic line a compass will point west of true north and the declination is negative.<ref>{{cite web |last1=USGS Education |title=How To Use a Compass with a USGS Topographic Map |date=July 2001 |url=https://education.usgs.gov/lessons/compass.html |publisher=United States Geological Survey |access-date=25 August 2018}}</ref>
==North geomagnetic pole== {{main|Geomagnetic pole}} As a first-order approximation, Earth's magnetic field can be modeled as a simple dipole (like a bar magnet), tilted about 10° with respect to Earth's rotation axis (which defines the geographic north and geographic south poles) and centered at Earth's center. The north and south geomagnetic poles are the antipodal points where the axis of this theoretical dipole intersects Earth's surface. If Earth's magnetic field were a perfect dipole then the field lines would be vertical at the geomagnetic poles, and they would coincide with the magnetic poles. However, the approximation is imperfect, and so the magnetic and geomagnetic poles lie some distance apart.<ref name="NGDC">{{cite web |url=https://www.ncei.noaa.gov/products/geomagnetism-frequently-asked-questions |title=Geomagnetism Frequently Asked Questions |publisher=National Geophysical Data Center |access-date=2018-04-28}}</ref>
Like the north magnetic pole, the north geomagnetic pole attracts the north pole of a bar magnet and so is in a physical sense actually a magnetic ''south'' pole. It is the center of the region of the magnetosphere in which the Aurora Borealis can be seen. As of 2015 it was located at approximately {{Coord|80|22|12|N|72|37|12|W|type:landmark_region:CA-NU|name=Geomagnetic North Pole 2005 est}}, over Ellesmere Island, Canada<ref name="NGDC"/> but it is now drifting away from North America and toward Siberia.
==Geomagnetic reversal== {{main|Geomagnetic reversal}} Over the life of Earth, the orientation of Earth's magnetic field has reversed many times, with magnetic north becoming magnetic south and vice versa – an event known as a geomagnetic reversal. Evidence of geomagnetic reversals can be seen at mid-ocean ridges where tectonic plates move apart and the seabed is filled in with magma. As the magma seeps out of the mantle, cools, and solidifies into igneous rock, it is imprinted with a record of the direction of the magnetic field at the time that the magma cooled.<ref>{{cite web|url=https://science.nasa.gov/science-news/science-at-nasa/2003/29dec_magneticfield/|title=Earth's Inconstant Magnetic Field – Science Mission Directorate|website=science.nasa.gov|date=29 December 2003|access-date=12 July 2017|archive-date=1 November 2022|archive-url=https://web.archive.org/web/20221101165248/https://science.nasa.gov/science-news/science-at-nasa/2003/29dec_magneticfield/|url-status=dead}}</ref>
==See also== * South magnetic pole * Polar alignment
==References== {{reflist}}
==External links== {{GeoGroupTemplate}} * {{cite web |url=https://www.ncei.noaa.gov/products/wandering-geomagnetic-poles |title=Wandering of the geomagnetic poles |work=Geomagnetism |publisher=National Geophysical Data Center |access-date=19 April 2012}} * {{cite web |url=http://geomag.nrcan.gc.ca/index-eng.php |title=Geomagnetism |publisher=Natural Resources Canada |date=1 April 2012 |access-date=19 April 2012 |archive-date=16 April 2012 |archive-url=https://web.archive.org/web/20120416091541/http://geomag.nrcan.gc.ca/index-eng.php |url-status=dead }} * [https://www.ncei.noaa.gov/products/wandering-geomagnetic-poles Map of pole's wandering] * {{cite news|url=https://www.cnn.com/2002/TECH/space/03/20/north.pole/ |title=North Magnetic Pole could be leaving Canada |newspaper=CNN.com |date=20 March 2002 |access-date=19 April 2012}} * {{cite news |url=http://news.bbc.co.uk/2/hi/science/nature/4520982.stm |title=Magnetic pole drifting fast |newspaper=BBC News |date=12 December 2005 |access-date=19 April 2012}} * {{Cite APOD |date=25 November 2002 |title=The Earth's magnetic field |access-date=2012-04-19}}
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Category:Polar regions of the Earth Category:Geography of the Arctic Category:Geomagnetism Category:Geology of the Arctic Category:Geography of the Northwest Territories Category:Orientation (geometry)