Image:Magnetic rope.png

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[edit] Summary

The self-constricting magnetic field lines and current paths in a Birkeland current (or magnetic rope). The current is strongest at the axis and becomes weaker further away. Currents flow parallel to the magnetic field, and derives partly from an external axial field and partly from the toroidal field produced by the current itself.

Image credit: http://history.nasa.gov/SP-345/ch15.htm#250 (and arrows coloured by myself)

[edit] Licensing

This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy)

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Use of NASA logos, insignia and emblems are restricted per US law 14 CFR 1221.
The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not in the public domain.
Materials from the Hubble Space Telescope may be copyrighted if they do not explicitly come from the STScI. [1]
All materials created by the SOHO probe are copyrighted and require permission for commercial non-educational use. [2]
Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3]

[edit] Automatically converted to PNG

The PNG crusade bot automatically converted this image to the more efficient PNG format. The image was previously uploaded as "Magnetic-rope.gif".

[edit] Previous file history

12:28:07, 2 October 2005 . . Iantresman (Talk | Contribs) . . 560x800 (34,325 bytes) (The magnetic field lines and current paths in a Birkeland current (or magnetic rope). The current is strongest at the axis and becomes weaker further away. Currents flow parallel to the magnetic field, and derives partly from an external axial field and p)

File history

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	Date/Time	Dimensions	User	Comment
current	04:39, 15 February 2007	560×800 (28 KB)	PNG crusade bot (Talk \| contribs)	(__NOTOC__ == Summary == The self-constricting magnetic field lines and current paths in a Birkeland current (or magnetic rope). The current is strongest at the axis and becomes weaker further away. Currents flow parallel to the magnetic field, and derives)