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The section on the heating of the corona appears to have information that is more understandable than the technical information contained in the definition and math sections. Unfortunately, I do not have enough understanding of the physics topic of this article to be able to properly condense it
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Since the constant coefficient in the second expression is approximately seven times the speed of light, many readers will surely wonder how this propagation speed avoids violating
Einstein's speed limit. Would someone who knows this field be so kind as to insert a brief mention?
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That's not the propagation speed, because you have yet to multiply it by all the factors to the right -- mass ratio, number density, and field. In particular, the factor of one over the square root of number density will decrease that value by many orders of magnitude.
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I think that an initial figure that corresponds to the basic theory would be most helpful. FIG 4.5 of Alvfén "Cosmical
Electrodynamics" is simple and appropriate, though if there is a public domain animated gif of a simple shear alfven wave that would be ideal.
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If someone with an understanding of Alfvén waves could take the basic info on the waves from the third paragraph of the corona section and combine it with a less technical definition then I think that would make for a better intro to the article.
550:{\displaystyle v_{A}\approx (2.18\times 10^{11}\,{\mbox{cm/s}})\,(m_{i}/m_{p})^{-1/2}\,(n_{i}/{\rm {cm}}^{-3})^{-1/2}\,(B/{\rm {gauss}})\approx (2.18\times 10^{6}\,{\mbox{km/s}})}
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There seem to be a problem with the velocity v : according to the third formula when va = c, v = c / sqrt(2) and not c. This is not what is written in the following paragraph...
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No, that formula is valid in the non-relativistic limit. The relativistic formula is in the "Relativistic case" section. ―
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on
Knowledge. If you would like to participate, please visit the project page, where you can join
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appropriate here? I think prose would be better for this info (see
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This article may be too technical for most readers to understand.
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Answer: There's no such thing as "permeativity". There is
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