You can think of the Arctic as only the top of the world and its northernmost point, if you're younger, home of Santa Claus. But it turns out that there are a large number of "north (and south) poles" on our planet. First and most simply, there is a town in Alaska called "Arctic" which is not near any of the other north poles (but it gets snow and gets a lot of mail addressed to Santa Claus). Then there is the geographic North Pole, also known as "true north."This is the place in the Arctic, where all lines manmade of longitude along on a map as the conceptual point on the ice-covered waters countless explorers wanted stabbing with their national-banner flagpoles, starting in 1827 by British Admiral Sir William Edward Parry.
Somewhat related to the geographic North Pole is much less well known instantaneous north pole , where earth rotation on the surface , and the Arctic sky , the shaft spears night sky ( an imaginary extension sort of way ) . The instantaneous north pole is not fixed . Rather, it moves in an irregular circle caused by the " Chandler wobble " - named for astronomer Seth Carlo Chandler , who in 1891 discovered that our planet wobbles as it spins . His discovery leads to the " north pole of balance ", which is in the center of the circle .
This separates all jargon unique, if not pedantic , definitions . So although they all share the word "Arctic , " everyone has clearly defined its own semantic territory . The same can not be said , but the last two " north poles " in this rundown, and both relate to very real magnetic field of the Earth , which is generated by fluid movements in the core of the planet . This movement affected by the Earth's rotation sets a naturally occurring electric generator that the magnetic field in position .
The magnetic pole describes the two locations (north and south), where the magnetic field of the planet is vertical. So if you are over the magnetic north pole of a compass, the needle would dip and try straight down, hence the other name on it: the magnetic dip pole. About the magnetic south pole, you would compass needle pointing upwards.
But there is still a magnetic north pole based: north geomagnetic pole. "One thing that is confusing is the fact that a magnetic pole and the geomagnetic pole, and that they are different," says Stefan Maus, a magnetic field modeller at the National Oceanic & Atmospheric Administration (NOAA) National Geophysical Data Center. "It is a historic and somewhat outdated definition."
The geomagnetic poles are almost an artifact of the decrease of complex and varied magnetic field of the Earth with that of a simple bar magnet, or dipole. "All we really want to know is where the field is truly vertical," says Maus. "The other pole, which is only an approximation, it is generally not very useful, and often leads to confusion." So while the north dip pole is in northern Canada, the northern dipole is about off the northwest coast of Greenland. But the geomagnetic pole is useful, if you're in the area, says Jeffrey J. Love, a U.S. Geological Survey geophysicist. The farther away from Earth you get, the more its magnetic field actually does behave like a dipole, or a bar magnet, even if in reality it is not like that. "A space physicist usually think in terms of the dipole tilt the earth," Love says, "while a navigator would probably be more interested in the magnetic poles dip."
To further confuse things, the dip poles move-sometimes with daily frequency. The magnetic North Pole in recent years has begun to shift quickly to Siberia. Its annual motion is accelerated 10-50 kilometers (6.2 to 31 miles), said Larry Newitt, emeritus scientist with the Geological Survey of Canada, which is the location of the pole has linked since 1973. Many expeditions And here's something even more confusion to add to the magnetic North Pole (aka dip pole) versus north geomagnetic pole (aka dipole): the magnetic pole in the northern hemisphere of the earth behaves like the south pole of a bar magnet. "If you look at the north pole of the bar magnet you have the field lines go from the North Pole to the South Pole, but the earth is the exact opposite," Maus explains. So the magnetic north pole is where to draw the direction of the planet which acts as the south pole of a bar magnet. Magnetic field lines of the Earth From a physical point of view than north needle of a compass (or a magnet) refers to the physico-but-not name the magnetic south pole of the earth that is to say in the direction of the North Pole.
"The north pole of your bar magnet is attracted to the north [magnetic] pole of the earth," Maus adds, the reverse of the usual situation in which the same poles of magnets repel each other. "That is why some people have suggested that this confusion, we should mention avoiding 'north-seeking pole." Magnetic north pole " Or that would add or subtract from the confusion remains unclear. It is clear that, even Santa Claus-related issues, one has to be very precise in specifying exactly what they talk about when referring to the "North Pole."
