What shape does magnetic dust take under the influence of its own magnetic field?
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Recently, I came across some very powerful neodymium magnets (the flat cylinder kind), and I accidentally broke one by snapping two of them together quickly. What I noticed is that the two halves don't go together regularly anymore. Instead, they had to be in opposite directions. Obviously, north attracts south and south attracts north.
I then wondered about what would happen if one of these magnets were continually broken up, into smaller and smaller magnets. I eventually came to a cube with alternating up and down magnetic particles, with no overall magnetic field. But I have a feeling this isn't right. If a magnet were broken (or filed down) into dust, what shape would that dust actually take
I then wondered about what would happen if one of these magnets were continually broken up, into smaller and smaller magnets. I eventually came to a cube with alternating up and down magnetic particles, with no overall magnetic field. But I have a feeling this isn't right. If a magnet were broken (or filed down) into dust, what shape would that dust actually take
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The notation DP1 is also used to indicate a class of magnetic disturbances with a maximum intensity in the auroral latitudes (ϕ = 67.5°). A characteristic feature of these magnetic substorms is the variation in field character over short distances on the surface of the earth. Over distances of a few hundred kilometers, the phase of a variation can change by 180° and the amplitude can vary by orders of magnitude. The currents giving rise to substorms flow in the lower ionosphere at an altitude of about 100 kilometers.
In polar regions, other disturbances which differ from substorms in their times of occurrence and geographic location are common. These disturbances are grouped together in the classification as DPC disturbances, though a more detailed subclassification is also used in which different varieties of these disturbances are called DP2, DP3, and DP4 disturbances, each with its own diagnostic features. DP2 disturbances can occur synchronously from the poles to the equator, with a duration of about 1 hour. The DP2 substorms are thought to be generated by a current system consisting of two vortices lying overhead at latitudes less than 30°.
DP3 disturbances commonly are located over one of the polar caps. They last for only a few hours. The current system for a DP3 disturbance has the form of 2 vortices of overhead currents at latitudes of 80 to 83°, and occur during daylight hours.
The DP4 disturbance occurs in the polar cap, and apparently is caused by a single current vortex.
In polar regions, other disturbances which differ from substorms in their times of occurrence and geographic location are common. These disturbances are grouped together in the classification as DPC disturbances, though a more detailed subclassification is also used in which different varieties of these disturbances are called DP2, DP3, and DP4 disturbances, each with its own diagnostic features. DP2 disturbances can occur synchronously from the poles to the equator, with a duration of about 1 hour. The DP2 substorms are thought to be generated by a current system consisting of two vortices lying overhead at latitudes less than 30°.
DP3 disturbances commonly are located over one of the polar caps. They last for only a few hours. The current system for a DP3 disturbance has the form of 2 vortices of overhead currents at latitudes of 80 to 83°, and occur during daylight hours.
The DP4 disturbance occurs in the polar cap, and apparently is caused by a single current vortex.
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