ETA (26 Nov 2012):
Michael apprently lied in
Michael after over 2 years has at last understood that Peratt's section title is not a defintion since he is back to the ridiculous claim that this section defines electrical discharges in cosmic plasma when the only mention of that in Peratt's entire book is in the
title of this section!
ETA:
Michael after over 2 years has at last understood that Peratt's section title is not a defintion and that Peratt's definition has two parts:
- a sudden release of electric or magnetic stored energy which
- generally occurs when the electromagnetic stress exceeds some threshold for breakdown that is usually detemined by small scale properties of the energy transmission medium"
That made me revisit this post and how it reflects the link text and title
. Changes in italics.Actual electrical discharges (like lightning) require breakdown of a dielectric medium (as per Peratt's
examples and generally in his definition). Plasmas are not a dielectric medium. Thus
actual electrical discharges are impossible in plasma.
ETA:
"Electrical discharge" is a rather ambiguous term in physics with multiple meanings depending on the context. For example it is used in the context of double layer destruction in cometary nuclei (
S. Ibadov (2012).)
The meanings that we are arguing over are
- Peratt: release of energy + generally dielectric breakdown.
Thus my emphasis on an actual electrical discharge.
- Dungey: Magnetic reconnection causes solar flares and induces changes in electrical fields. The changes in electrical fields cause large current densities. He calls these 'electrical discharges'
- There may be other meanings hidden away in the literature on solar flares.
Peratt has no examples of exceptions to a dialectic breakdown.
Peratt has no examples of any electrical discharge in plasma.
The implication is that there are no electrical discharges (other than large current densities) in plasma. This is confirmed by the lack of discussion of electrical discharge in plasma in any textbook.
Does this have any physical significance to solar flares?
There are over
30,000 results for 'solar flare' in the
SAO/NASA Astrophysics Data System (ADS). But there are only
32 results for 'solar flare electrical discharge'.
When we look at a sample of these
32 results then all we have is Dungey's meaning (so far

), i.e. the standard MR causes solar flares theory.
Thus the answer is basically none. If electrical discharges had any physical significance in solar flares then there would be hundreds or thousands of results.
11th October 2011: Peratt's definition of electrical discharge
This is ordinary electrical discharge - he gives the example of lightning and aurora.
The full text of the section is here:
Peratt and Electrical Discharges in Cosmic Plasma
This section title is "1 .5 Electrίcal Discharges in Cosmic Plasma" so I should mention that this is the title not a definition. Do you know the distinction now,
Michael?
11th January 2011: Michael still has no idea what a title is or difference between a title and a definition!
So will
Michael understand that there is no discussion or examples of electrical discharges in plasma in Peratt's book or any other textbook anytime in the next 3 years

?
5th February 2011: Why does Peratt's page talk about aurora and lightning?
And
7th December 2010: Where are Peratt's many pages of the physics and mathematics of electrical discharges?
Peratt is not the only scientist who has ever existed so:
26th September 2011: Where is the discussion of 'electrical discharges in plasma' in any textbook?
There is Dr Charles Bruce and his invalid idea about lightning on the Sun (
Errors in Micheal's site VIII (Dr. Charles Bruce was wrong)!).
This expert in electrical discharges did not just state that there are electrical discharges in plasma on the Sun. He stated that his
requirement for electrical discharges in plasma on the Sun was that the plasma must contain dust particles.
You may go on about Dungey again so:
18th October 2011: Dungey's 'electric discharge' = high current density in magnetic reconnection
13th January 2011: Dungey's and Peratt's definition of discharge are different!
8th November 2011: Citing Dungey means that cause of solar flares is magnetic reconnection!
Michael has given citations to support the above.
- James Dungey 1
"Discharges are shown to be a possible source of high energy particles, if the current density is very large. The growth of the current density is discussed using the fact that the magnetic lines of force are approximately frozen into the ionized gas. It is shown that discharges are unlikely to occur anywhere except at neutral points of the magnetic field. Neutral points are found to be unstable in such a way that a small perturbation will start a discharge in a time of the order of the characteristic time of the system. Such discharges may account for aurorae, and may also occur in solar flares and the interstellar gas"
Emphasis added. His 'discharge' is an existing current density that grows, i.e. not a discharge!
- James Dungey 2
"The suggestion that an solar flare resuts from an electrical discharge situated in the neighbourhood of a neutral point of the magnetic field was made by Giovanelli [2].
...
The defining feature of a discharge in this context is the existence of a large current density."
- Ronald Giovanelli (a book reference)
- J. P. Wild (1963)
A conference proceeding so not peer- reviewed. A mention of "Several theories yielding sudden electrical discharges..." and the theories referenced (Sweet;Gold and Hoyle) are MR inducing large currents. IOW Dungey's usage.
- T. S. Kozhanov (1973)
The title is "Nonthermal X Rays and Electric Currents in Solar Flares." One "electrical discharge" with a reference back to Giovanelli so this is his and Dungey's usage.
- E. Ya. Vil'koviskii (1974)
A section title "Electrical dicharge in the chromosphere" which not enough to tell whether this is Dungey's usage. The assumption of existing curents supports this. No astronomer would be stupid enough to think that there is lightning on the Sun so it is either Dungey's usage or their own.
Michael has now stated that this is Dungey's usage of the words 'electrical discharge' for large current densities which is an option that I list above!
So I need to mention that this is part of the ridiculous act of Michael cites papers that state that solar flares are magnetic reconnection, thus debunking his own idea!
Interesting but not directly relevant
- Tatsuzo Obayashi (1975)
This interesting paper has an abstract with MR then an "electrical discharge". But the paper actually does not mention any electrical discharges :o! This looks like an editing choice for an understandable, short abstract. The "electrical discharge" is the solar flare equivalent of the auroral electrojet which they are introducing.
- S. Ibadov (2012)
This is double layers induced at the comet having an "electrical discharge potential". However double layers are "destroyed" rather than "discharged". And the abstarct says this happens inside the nucleus not in plasma.
Michael seem to have never read the abstract so here it is in full:
Problems connected with mechanisms for comet brightness outbursts as well as for gamma-ray bursts remain open. Meantime, calculations show that irradiation of a certain class of comet nuclei, having high specific electric resistance, by intense fluxes of energetic protons and positively charged ions with kinetic energies more than 1 MeV/nucleon, ejected from the Sun during strong solar flares, can produce a macroscopic high-voltage electric double layer with positive charge in the subsurface zone of the nucleus, during irradiation times of the order of 10–100 h at heliocentric distances around 1–10 AU. The maximum electric energy accumulated in such layer will be restricted by the electric discharge potential of the layer material. For comet nuclei with typical radii of the order of 1–10 km the accumulated energy of such natural electric capacitor is comparable to the energy of large comet outbursts that are estimated on the basis of ground based optical observations. The impulse gamma and X-ray radiation together with optical burst from the comet nucleus during solar flares, anticipated due to high-voltage electric discharge, may serve as an indicator of realization of the processes above considered. Multi-wavelength observations of comets and pseudo-asteroids of cometary origin, having brightness correlation with solar activity, using ground based optical telescopes as well as space gamma and X-ray observatories, during strong solar flares, are very interesting for the physics of comets as well as for high energy astrophysics.
And:
Charles Bruce
A crank who thought that there was actual lightning on the Sun:
Errors in Micheal's site VIII (Dr. Charles Bruce was wrong)!