Replying to:<BR/><DIV CLASS='Discussion_PostQuote'><br /><p>Is it a coincidence in your opinion that all the "predicted" behaviors from Birkeland's models, including coronal loop activity, solar wind acceleration, auroras are now being attributed to "magnetic reconnection"?</p><p>What is the fundental difference between "circuit reconnection" in Birkeland's experiments and the "magnetic reconnection" you believe is responsible for these predicted events? Don't both "circuit reconnection" and "magnetic reconnection" require "current flow" in disctinct "lines" or 'circuits"? </p><p> Posted by michaelmozina</DIV></p><p>Despite the fact that these are heavily loaded questions, I will answer them...again. I don't care if Birkeland predicted them or not(I have a feeling you are just assuming he would have predicted them)...his experiment did not address the "why" part of the question. As in, why does current get accelerated? Since he started with a cathode ray, he was just assuming that there was a flow of charged particles...a correct assumption, but it does not address how the particles are accelerated. Empirical experiments are great for demonstrating ideas, but not so much for explaining the actual mechanism. You need theory for that. That's where reconnection comes in. So I'm not sure what you mean by coincidence...it's just the natural extension of his experiments. He showed us that current flow can produce events like aurorae, people came up with reconnection to explain why we have accelerated electrons to begin with. </p><p>Here is your answer to the other question, provided quite clearly in the abstract of the paper you claim to agree with.</p><p>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>The properties of relatively simple magnetic field models provide a strong preference for one of two definitions of magnetic reconnection that exist in the literature. Any concept of magnetic reconnection defined in terms of magnetic topology seems naturally restricted to cases where the magnetic field vanishes somewhere in the nonideal (diffusion) region. The main part of this paper is concerned with magnetic reconnection in nonvanishing magnetic fields (finite-B reconnection), which has attracted less attention in the past. We show that <em>E</em> <sub>∥</sub> (the electric field component parallel to the magnetic field) plays a crucial physical role in finite-B reconnection, and we present two theorems involving <em>E</em> <sub>∥</sub>. The first states a necessary and sufficient condition on <em>E</em> <sub>∥</sub> for global reconnection to occur. Here the term ”global” means the generic case where the breakdown of magnetic connection occurs for plasma elements that stay outside the nonideal region. The second theorem relates the change of magnetic helicity to <em>E</em> <sub>∥</sub> for cases where the electric field vanishes at large distances.</DIV></p><p>Did Alfven criticize parallel electric fields? Did he criticize the idea of a changing magnetic helicity? Do you even realize what these terms mean? Just because they refer to the word "electric" does not mean they are talking about circuits. There is current flow, yes, and obviously, yes, it does generate a magnetic field. However, the idea that it must flow in distinct lines in closed circuits is not required and I have seen nothing suggesting such a thing. Michael, you are basically asking us to do what it is you said you would do yourself. I can't think of a way of explaining reconnection using circuits, and neither can you apparently. And by explain I mean using physics equations, not just saying it is. </p><p>A lot of things require current flow. It doesn't mean they are all the same thing. </p> <div class="Discussion_UserSignature"> </div>