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2. Earth's magnetic field - Wikipedia

   en.wikipedia.org/wiki/Earth's_magnetic_field

   The Earth and most of the planets in the Solar System, as well as the Sun and other stars, all generate magnetic fields through the motion of electrically conducting fluids. [54] The Earth's field originates in its core. This is a region of iron alloys extending to about 3400 km (the radius of the Earth is 6370 km).

3. Dipole model of the Earth's magnetic field - Wikipedia

   en.wikipedia.org/wiki/Dipole_model_of_the_earth's...

   The dipole model of the Earth's magnetic field is a first order approximation of the rather complex true Earth's magnetic field. Due to effects of the interplanetary magnetic field (IMF), and the solar wind, the dipole model is particularly inaccurate at high L-shells (e.g., above L=3), but may be a good approximation for lower L-shells.

4. Dynamo theory - Wikipedia

   en.wikipedia.org/wiki/Dynamo_theory

   In physics, the dynamo theory proposes a mechanism by which a celestial body such as Earth or a star generates a magnetic field. The dynamo theory describes the process through which a rotating, convecting, and electrically conducting fluid can maintain a magnetic field over astronomical time scales. A dynamo is thought to be the source of the ...

5. Geomagnetic secular variation - Wikipedia

   en.wikipedia.org/wiki/Geomagnetic_secular_variation

   Geomagnetic secular variation refers to changes in the Earth's magnetic field on time scales of about a year or more. These changes mostly reflect changes in the Earth's interior, while more rapid changes mostly originate in the ionosphere or magnetosphere. [1] The geomagnetic field changes on time scales from milliseconds to millions of years.

6. International Geomagnetic Reference Field - Wikipedia

   en.wikipedia.org/wiki/International_Geomagnetic...

   Standard model of the structure of Earth's magnetic field. The International Geomagnetic Reference Field (IGRF) is a standard mathematical description of the large-scale structure of the Earth's main magnetic field and its secular variation. It was created by fitting parameters of a mathematical model of the magnetic field to measured magnetic ...

7. L-shell - Wikipedia

   en.wikipedia.org/wiki/L-shell

   Plot showing field lines (which, in three dimensions would describe "shells") for L-values 1.5, 2, 3, 4 and 5 using a dipole model of the Earth's magnetic field. The L-shell, L-value, or McIlwain L-parameter (after Carl E. McIlwain) is a parameter describing a particular set of planetary magnetic field lines.

8. Ancient bricks baked when Nebuchadnezzar II was king ... - AOL

   www.aol.com/ancient-bricks-reveal-clues-massive...

   “Overall, this is exciting work because it is helping us understand what Earth’s magnetic field is doing through time and will also help determine the age of artifacts that otherwise would be ...

9. World Magnetic Model - Wikipedia

   en.wikipedia.org/wiki/World_Magnetic_Model

   World Magnetic Model. Magnetic declination map at sea-level for the year 2010 derived from WMM2010. The World Magnetic Model (WMM) is a large spatial-scale representation of the Earth's magnetic field. It was developed jointly by the US National Geophysical Data Center and the British Geological Survey. The data and updates are issued by the US ...