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straighten a bent flux tube. External pressures on the flux tube can stop it expanding in area and/or keep is bent but are needed to oppose the
Maxwell pressure and the tension force. By the way, I dislike the universally used name "tension force" which comes from thinking of guitar strings that return to straight after plucking. The reason I don't like it is that the force of a bent flux tube vanishes once it is straight whereas the tension on a guitar string remains once it is straight. I always use the term "flux tube curvature force" - but I seem to be about the only one to worry about these semantics!
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field does not thread the surface (so the tube funnels out - i.e. grows in cross sectional area if the field lines diverge and funnel together if the converge. For me the key definition is that magnetic flux in a flux tube tube is conserved along the tube (which is a consequence of no field threading the tube surface and div(B) = 0): so $ F = {\int}_A \vec{B}.\vec{da}$ is constant along a flux tube where $ \vec{da}$ is an element of cross sectional area of the tube, $ \vec{B}$ is the field in the tube, and the integral is over the cross sectional area of the tube, A.
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Because div(B) = 0, all flux tubes (if they have finite length) must, eventually, wrap itself around and its ends connect to form a torus (otherwise magnetic monopoles exist and they have never been definitively detected and if they do exist they are highly exotic for sure!). Hence the tube is either
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400). I would never offer an opinion on a page I was conflicted on but I thought it would be OK to update a factual number that somebody else had put there. Nevertheless, I do get the point and next time I will point it out to another wikipedia editor and leave it up to them if they think it should
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Hi there, I'll look at the page in a moment. But first thoughts: the surface the definition refers to is like a hollow tube and is closed in that it is a surface that wraps around on itself in the 2 spatial dimensions perpendicular to the tube axis to form the tube. The key point is that magnetic
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The series of portraits was commissioned by IUG and STFC to be freely available - I just do not know for sure that they were given a CC-By licence, so did not feel I could click on that. I will contact the photographer (Max
Alexander - he is a friend, and indeed I was one of the portraits in the
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Thanks - my mistake. I think what happened was I made a change (that as you say was more than minor) that I then corrected a typo in and so only marked it a minor at that stage. Will watch out for that in future. I have made some more changes just now (which I have explained and not classed as
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Flux tubes can change in cross sectional area and can bend. However, when we add charged particles in a quasi-neutral magnetoplasma, the MHD force balance shows that there is a magnetic (Maxwell) pressure that acts perpendicular to B (of $ B^2/(2{\mu}_o$ ) and a "tension" force that acts to
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Apolgies - as I took the photograph of my Issac Koga medal (I won it in 1990), I thought it would be OK! I would thought that is a highly debatable rather than a blatant copyright infringement. It would be good if someone could add a photo of Issac Koga and the gold medal that is OK to use.
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OK - I have just looked at the page and it looks good to me. The definition part you point to is, however, very confusing. I would stress that, by definition, magnetic flux enters and leaves the tube only through its ends and not through its walls
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series): and if they are not CC-By I will get his written permission to use this particular portrait of Mike Cruise on the RAS presidents website. If it has been removed by then, I will just upload it again. Thanks.
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