File:Simple model of the Earth's magnetic field.ogv

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Original file ‎(Ogg Theora video file, length 1 min 15 s, 1,920 × 1,080 pixels, 10.06 Mbps, file size: 89.97 MB)

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This visualization shows a simple model of the Earth's magnetic field. The magnetic field partially shields the Earth from harmful charged particles emanating from the Sun. The field is stretched back away from Sun by solar particles and radiation pressure.

The geomagnetic field is generated (and regenerated) as the conducting fluid of the Earth's mantle and core, driven by convection of heat from deeper in the interior, induces an electromotive force (EMF) with the existing magnetic field. This process is very similar to the way an electric generator generates a voltage. That voltage then drives an induced current in the conducting fluid, which also produces a magnetic field. This feedback mechanism helps maintain the field, continuously converting the thermal energy in the Earth into magnetic field energy.

The magnetic field line data used in this visualization is from a simplified static model. More complex models deform the magnetic field over time as the Earth rotates and experiences solar pressures. Many of the field lines (particulary near the back, away from the Sun) should eventually connect (north and south poles), but the 3d model used in this visualization does not extend far enough to see this.

The day/night terminator is aligned with the Sun and is therefore aligned with the magnetic field too.
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Author NASA/Goddard Space Flight Center Scientific Visualization Studio
Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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Date/TimeThumbnailDimensionsUserComment
current21:32, 29 March 20111 min 15 s, 1,920 × 1,080 (89.97 MB)Tryphon (talk | contribs){{Information |Description=This visualization shows a simple model of the en:Earth's en:magnetic field. The magnetic field partially shields the Earth from harmful charged particles emanating from the en:Sun. The field is stretched back

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VP9 1080P 5.07 Mbps Completed 16:03, 19 October 2018 9 min 6 s
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