I only briefly looked at that paper, but how can you say it doesn't mention electric discharges if it mentions electric fields, electric currents, electric current densities and magnetic fields? Are you aware that electric discharge is the only known way to produce a magnetic field?
Nope, just a current will do nicely thank you, either in a plasma of in a wire and you get a nice magnetic field. A discharge is not necessary at all. You might want to look up your electrodynamics books once more.
Mentioning a magnetic field is implicitly mentioning the electric field driving it.
Huh? That might be true in some cases, don't over generalize. Seed magnetic fields (created by statistical fluctuations in a plasma) in a turbulent medium can be pulled and twisted and you get yourself a dynamo process.
A field isn't an infinite plane like the geometrical construct, it's electricity in motion, electricity discharging. There are several modes of electric discharge, not all of it produces visible light, but every electric discharge consists of a specific current, and a specific current density.
"electricity in motion"? First of all there is not such thing as a general accepted usage of "electricity" in solar or plasma physics, you might as well say poetry in motion.
Nobody is claiming here an "infinite plane electric field" why would we? There may be an EMF generated along a magnetic loop, that would be weird to claim that that is an "infinite plane" so I have no idea where you get that idea.
What exactly is "electricity discharging"??? another made up term
An electrical discharge in the general sense is (From Oxford Reference "concise science dictionary"):
- The conversion of the chemical energy stored in s secondary cell into electrical energy.
- The release of electric charge from a capacitor in an external circuit.
- The passage of charge carriers through a gas at low pressure in a discharge tube. A potential difference applied between cathode and anode creates an electric field that accelerates any free electrons and ions to their appropriate electrodes. Collisions alo produce excited ions and molecules which decay with emission of light in certan parts of the tube.
Now I had to look hard to get any "discharges" in my plasma physics books, but Peratt had it in the index, basically with the extra: "associated with lightning" and "in aurora" and "breakdown of atmpsohere" and "in dielectrics". Now Peratt re-defines the term discharge as it is usually used (on page 22):
Peratt said:
An electrical discharge is a sudden release of electric or magnetic stored energy . This generally occurs when the electromagnetic stress exceeds some threshold for breakdown that is usually determined by small scale properties of the energy transmission medium. As such, discharges are
local phenomena and are usually accompanied by violent prαesses such as rapid heating, ionization, the creation of pinched and filamentary conduction channels, particle acceleration, and the generation of prodigious amounts of electromagnetic radiatiοη.
So, he puts it in a broader sense, however there is still the "breakdown" of the medium that is needed. The last bit of the quote is just a description of e.g. lightning. But then he starts to go further, e.g. about the aurora, and calls them a "discharge":
Peratt said:
The aurora is a discharge caused by the bombardment of atoms in the upper atmosphere by 1–20 keV electrons and 200 keV ions spiralling down the earth's magnetic field lines at high latitudes . Here, the electric field accelerating the charged particles d erιves from plasma moving across the earth's dipole magnetic field lines many earth radii into the magnetosphere.
the electric fields that accelerate the electrons and ions (and naturally that have to be different electric fields, and anyway the electrons do most of the job in creating aurorae) are created by motions of the magnetic field in the tail, which sets up currents. As the current gets too high that the thermal drift of the charge carriers can no longer uphold the total current density, then a electric field (double layer) if formed that accelerates the charge carriers and thus can keep up with the increasing current density. The aurora is below such acceleration regions where the energetic electrons enter a denser region and react with the local nitrogen and oxygen to create the aurora. To call the aurora a "discharge" makes no sense at all.
So, yeah, a discharge is related to a current (and thus a current density), nobody is rejecting that. However, the question is how to understand the word discharge, would any increase in current density be considered a discharge? I think not
You can't have this current and current density without the discharge. If you're finding yourself in conflict over this specific issue a lot, perhaps it's time to reexamine some of your basic assumptions.
One can easily have currents and current densities (you talk about the two as if they are separate entities, they are not) in a plasma, there is no necessity of having a discharge at all, unless you want to go to the very extended definition by Peratt, however, most of the time the currents in solar prominences just increases gradually up to a certain limit, when indeed dramatic processes can occur. But it never starts up with a discharge.