I have not read the paper yet, too busy writing my own paper at the moment, but will do it this weekend or this evening after the gym.

Well, you cannot be a Swedish space physicist and NOT be influenced by Alfvén (mm bet you can't be a plasma physicist in general and not be influenced by him). What Hultqvist is describing is basically the mainstream view of aurora's, when I look at it quickly, field aligned (Birkeland) currents, parallel electric fields, inverted V's etc.

Alfvén was a great plasma physicist, unfortunately at the end of his life he started moving into some strange stuff, like his "resonance theory" in the Saturnian rings (he even wanted me to start working on that when I was in Stockholm, but my PhD experiments were on double layers, so his "request" was a bit off topic). So, let's just remember him as the guy who created MHD, double layers and some other interesting stuff.

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