W.D.Clinger
Philosopher
For this post only, I will pretend you understand the concepts of vector fields and magnetic field lines.I haven't been through the second two links yet, but the first one does not appear to be related to a *LABORATORY* experiment per se. Some of the others may in fact provide such info. Nevertheless, I have two initial question for you about the first paper.
A) What is an "open" field line?
An open field line c(t) is one for which c(t)=c(t') implies t=t'.
From what you have written about the latter, it appears to me that examples of the latter are examples of the former, but not every example of the former is an example of the latter.B) How is a "magnetic flux tube" not a "Bennett Pinch/Magnetic Rope/Pinched filament/circuit" as Alfven describes them?
ETA: Sorry, I was wrong. According to Wikipedia, a Bennett pinch is a phenomenon, like the other stuff described by Alfvén, and informal. A magnetic flux tube, on the other hand, is a mathematically precise concept (as are magnetic field lines), although astrophysicists may well speak informally of magnetic flux tubes that do not coincide with their mathematical definition.
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