Lets ask the expert on DL's and a person who has worked with the PC "God" Hannes Alfven, me 'ol mate Tusenfem.
What exactly does Mr Alfven mean by the above statement?
What would be good examples to cite as DL's in the universe?
Can our Sun's Heliosphere be classed as a DL by you, Tusenfem, the authority on DL's?
I though YOU were the expert on EU,
Sol88 and thus YOU should know what Alfvén meant when he wrote the above quote.
What is meant, however, is that when currents flow (yes currents do flow in plasmas) and there is a tenuous plasma, then the drift of the particles combined with the density are no longer capable to carry the current density and therefore, something has to happen (because div(J) ≠ 0 is a bit of a problem) and thus the plasma generates a mechanism in which the drift of the particles can be increased (as increasing the density is not really an option, but I am sure you would advocate that, because I now claim it is not) and the way to do that is by accelerating them in an electric field, and when you do plasma physics (not MHD, please, I hope you understand) then you find that one of the solutions is a double layer. What one should notice, however, is that those "macroscopic" lengths are still relatively small and any large potential drop in one double layer tends to split itself into smaller (stair-step) double layers.
Double layers in the universe. Those would be in the Earth's magnetosphere (observed by Viking, Freja, Cluster, THEMIS) but they are elusive, because the are so small, move fast and electric fields are not easy to measure by satellites.
Then they can happen in any current carrying plasma, like in solar prominences, you know, you have my paper about the topic.
Then the electric field at the magnetic poles of a pulsar could be interpreted as a double layer.
Then at the border of plasmas with different properties.
etc. etc. etc. I am sure you know the wiki page about double layers by heart, so I can stop here, instead of rewriting what I wrote on that page.
The Sun's heliosphere cannot be regarded as a double layer, I would not know why you would propose that.
So,
Sol88, as I have answered
EVERY QUESTION YOU EVER ASKED are you going to do the same? Or are you going to continue to misinterpret everything you read in press releases and wiki? Some of the questions are:
- Dear Sol88 do you know the difference between a gas and a plasma?
- Dear Sol88 do you know the difference between a ionized gas and a plasma?
- Dear Sol88 do you know the difference between a MHD and a plasma physics?
- Oh dear oh dear. Sol88 you are still in the stadium that you might just understand Alfven's MHD theory, that is magnetohydrodynamics, a simplified way to describe plasma physics. And do you see the hydro part in that word, what does it mean?
- Are you going to, or have you already send Lerner and Peratt that email?
- Are you going to present us a plasma physics model that does not need gas laws (would be different though, to get the total plasma pressure, but I am looking forward to your effort)
- Do you understand the principle of quasi-neutrality of a plasma and what effect this has on gravitational effect on said plasma?
I guess that is enough for now.