<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>His talk is about current sheets, not reconnection. Though his work with reconnection has been extensive. If I see him somewhere outside of the talk I may ask him some questions, but I'm not going to waste everyone's time at the talk asking unrelated questions. </DIV></p><p>That's thoughtful of you. You might just invite him to join our discussion. </p><p>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>As for the rest of your argument, you're just talking around things again. You didn't even make a single comment about the fact that I DID read Alfven's papers yesterday(not the book, but expecting someone to read an entire book in a few days when they have a job is kind of unreasonable), or the paper that provides a mathematical basis of reconnection, deriving it from Euler potentials. You need to stop addressing these papers' arguments sentence by sentence. It is often the case that they say something that you could argue, then in a few sentences explain why that isn't true.</DIV></p><p>I explained in one sentence why that PPPL paper was not valid and you sort of ignored the whole point. This is nothing more than a z-pinched filament in plasma that ultimately ends up "pinching" itself in a collision process near the core of the spinning filament. They assumed the electrical current remain constant, but in reality, that current flow was disrupted by the pinch and the electrical field changed as a result. Nothing about this event involved "magnetic reconnection". It's pure particle physics and electromagnetic interaction between moving particles. There is nothing mysterious about this event, and they made a very bad "assumption". </p><p>The one sentence version was: Between equations 15 and 16 they "assumed" that the electric field remained constant, during a z-pinch process in plasma that was being driving by electrical current. There is no process of "magnetic reconnection" going on inside of a z-pinch filament. Its simply a "Bennet Pinch", nothing more, nothing less, nothing else.</p><p>DrRocket even noted that induction would be a valid way to transfer energy from a magnetic field (that actually itself composed of flowing charged particles) into kineitic energy in another circuit. There is absolutely no need to resort to "magnetic reconnection" either to explain the original obaservations in the THEMIS data, or even an "acceleration event" type of an idea based on induction. Neither of these ideas violates Maxwell's equations.</p><p>Plasma is known to release neutrons during z-pinch events, and indeed we find neutron capture signatures in coronal loop activity in the solar atmosphere. Rhessi observes gamma rays from discharge events in the solar atmosphere and indeed we observe gamma radiation near the base of coronal loops in Rhessi images of the solar atmosphere.</p><p>That whole PPPL event took place inside of a "discharge event", from beginning to end. The driving motive force here is the kinetic energy of the flowing charged particles. The magnetic field winds itself around this flow channel and ultimately 'pinches" it into more tightly wound filament channels that look something like a twister in plasma. You can observe them in an ordinary $20 plasma ball from Walmart.</p><p>I suppose if you took a cross section of plasma from that plasma ball and you looked at it with only at the magnetic fields in that sheet, it would look like there were tiny little "magnetic islands" inside of a flowing current sheet. At the physical level, those "magnetic islands" would be composed of flowing charged particles inside a plasma thread. </p><p>FYI I actually liked the first paper you cited in that respect because I can rationally understand how they might "thiink" these are "magnetic islands", but when you look at the real physics, it's a flowing stream of current that is creating these magnetic islands.</p><p>It's been all downhill from there IMO, particularly the PPPL paper and especially the last THEMIS paper. </p><p>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'> Also, I'm not going to give you an "outline". This isn't third grade where we have to write book reports to prove we read something. </DIV></p><p>I'd just like to know that you actually read the reference material I provided to you. I took the time to (reread) that PPPL paper, and your magnetic island paper, but I see no sign that you have addressed any of the points Alfven made about the idea of magnetic reconnection inside of interplanetary space. So far I see no evidence that any of you have read the first paper I cited.</p><p>To DrRocket's credit, he's read quite a bit of Alfven's early work, although he seem allergic to his later work in Cosmic Plasma theory.
</p><p>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>I read his early papers from the 40s, and browsed over his later ones. I thought it was interesting that as time progressed you could notice him getting more and more angry/bitter with the community.</DIV></p><p>Good scientist acquire wisdom over time. You should be reading his later work too, not just a couple of papers. The one I cited for you was specifically on the topic of "magnetic reconnection" in the magnetosphere and it is directly related to this topic of conversation since I started this process by critiquing that last THEMIS presentation.</p><p>Alfven did not come across "bitter" in his writings, at least not that I can tell. He was carreful to point out the common pitfalls and common misconceptions that had been talked about in relation to MHD theory. It seems to me that nothing much has changed. The mainstream is still making the same mistakes, over and over and over again. I'm glad that he took the time to at least address these common fallacies about MHD theory so that I could understand how they 'evolved' and why they didn't make sense in MHD theory.</p><p>I do think Alfven was like Birkeland however in the sense that he was *way* ahead of his time. I think he found it difficult to communicate the full range of MHD theory (including the current flow part) although he seemed to find a protege' in Peratt. Peratt took his basic ideas and build computer models to see what they would find. Peratt has written extensively about the outcome and the many links to observed events in space.</p><p>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'> Nonetheless, reconnection is 1) proven to be a viable physical process from basic physics equations</DIV></p><p>Not exactly. DrRocket's "induction" is not "magnetic reconnection". Flowing current channels traveling in oposite directions "reconnect" electrically and kinetically, but not 'magnetically'. The magnetic field is simply following the flowing particles. When we look at a copper wire that contains flowing electrons, we observe changing magnetic fields throughout the day. The magnetic field is created by the flowiing electrons in the copper wire, and the strength of the magnetic field is related to the number of electrons flowing through the wire. The variation we observe is due to the variable number of electrons that pass through the wire, not because of "magnetic reconnection".</p><p>Since plasma is not rigid like the copper wire, and positive ions can also "flow" and generate magnetic fields, we must extend our notion of "current flow" to include no only electrons, but any postively or negatively charged particle that is in motion relative to the bodies in our solar system. It's "current flow" that's doing all the work here folks, not "magnetic reconnection"". I'll even cop to the legitimacy of DrRockets arguement (which Alfven also accepted and wrote about) about the possiblity of induction processes that accelerate particles due to a changing magnetic field. What there is absolutely no need of is "magnetic reconnection". Maxwell's equations treat the magnetic field as as complete and whole continuum. All the particle physicsl processes inside of a current sheet have already been described by Alfven in MHD theory. There is no need to introduce any form of "magnetic reconnection" to explain particle accleration events inside of an existing current sheet. The whole of interplanetary space exists inside of a flowing continuum of moving charged particles, otherwise known as "current flow". </p><p>Those THEMIS observations may have had something to do with "induction", and they probably had a lot to do with "current flow", but they had absolutely nothing whatesoever to do with "magnetic reconnection". </p><p>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'> 2) backed up by observation </DIV></p><p>What observation? I observed that both of their magnetic reconnection models failed to correctly predict the observed flow of particles. The only thing that was "backed up" by these observations is the fact that magnetic reconnection theory is utterly useless when it comes to making accurate "predictions" about the flow patterns of charged particles. That's hardly surprising since the whole theory is *outside* the bounds of MHD theory. </p><p>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>3) demonstrated in the lab(more people did similar but not identical things to the PPPL paper)</DIV></p><p>Did it happen inside or outside of a current sheet? All that was demonstrated in that lab was a z-pinch filament in plasma driven by an electrical discharge through plasma. Period. The current flow was not consistent, therefore the electromagnetic field was variable. No big deal. Alfven's already explained the math *and the particle physics* behind that process.</p><p>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>and I have provided the major agreed upon definitions.</DIV></p><p>The don't seem to agree on much if you ask me. They sure seem to hedge their bets a whole lot for a bunch of folks that seem absolutely convinced of the validity of their idea. There's no real physical model specified by any of ther references you have cited.</p><p>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'> My recent postings have been proving you wrong on numerous points(magnetic reconnection violates Maxwell's equations, magnetic reconnection has no agreed upon definition, etc etc)...I give up. You clearly don't understand what reconnection is. </DIV></p><p>
LOL Nobody "understands" what reconnection is, and that's the whole problem in a nutshell. Don't blame me personally for the sins of the whole industry. That was a funny comment!</p><p>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>I gave you papers that would educate you on what it is, but you ignore them. </DIV></p><p>I read them, and I pointed out the exact equation where the paper went to hell in a handbasket in the PPL paper. They *assumed* something they they never verified and that was not true and therefore the rest of the math is pointless. You didn't even read Alfven's paper on this topic, or at least you have never commented on it. I at least have responded to every key point in the first two paper you asked me to read. </p><p>I also gave you a physical way to "explain" a "magnetic island" and I pointed out that the Hall effect is not a "classic sign" of "magnetic reconnection", but rather a classic sign of "current flow".</p><p>When did you even comment on Alfven's paper about magnetic reocnnection in the magnetosphere?</p><p>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>If you did, you would stop asking "why call it reconnection if no lines are cut and reconnected", because the answer to that is simple: that is not what reconnection is defined as. </DIV></p><p>It isn't physically defined and agreed upon, and that's the problem. It's outside the scope of plasma physics because it has not been physically explained. Everything inside of MHD theory is based on particle physics processes between various charged particles. There is nothing physically undefined in MHD theory.</p><p>Without a physical model to work with, and without a physical understanding of what is unique about "magnetic reconnection" as it relates to particle physics, it's absolutely and completely impossible to differentiate the idea from either "current flow events' (z-pinch) or "induction". </p><p>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>In none of the definitions do they use those words. It is merely a simplified way of relating the concept to people unfamiliar with it. <br /> Posted by UFmbutler</DIV></p><p>IMO it a useless word that is specifcally and intentionally misleading, it is unncessary and it is completely irrelevant to plasma physics. It's perfect example of accepted dogma and mythos, dressed up in mathematics, much like Chapman's ideas when they were popular. </p> <div class="Discussion_UserSignature">
It seems to be a natural consequence of our points of view to assume that the whole of space is filled with electrons and flying electric ions of all kinds. - Kristian Birkeland </div>