File:Magnetic rope.svg

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Summary

DescriptionMagnetic rope.svg	English: 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. Current flows parallel to the magnetic field, and derives partly from an external axial field and partly from the toroidal field produced by the current itself.
Date	23 June 2012
Source	http://history.nasa.gov/SP-345/ch15.htm#250
Author	NASA; edited by Jaybear

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Licensing

	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.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. 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 necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its 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] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

File history

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	Date/Time	Dimensions	User	Comment
current	18:21, 23 March 2013	262 × 432 (14 KB)	Jaybear	correction of doubled patches;
	18:01, 23 March 2013	262 × 432 (14 KB)	Jaybear	some reformatting & color correction;
	17:43, 23 March 2013	262 × 432 (14 KB)	Jaybear	2 Missing green direction-arrows added; uniform whitespace added around the object; colors adjusted slightly; minor corrections on curves' patches at crossing points;
	23:14, 23 June 2012	257 × 424 (15 KB)	CharlesChandler