Proto-stellar Filaments
Due to the presence of electric and magnetic fields, some researchers believe that electric currents form the filaments, perhaps by the magnetic pinch effect.1,2,3
There are three main criticisms to the Magnetic Pinch model. First, net charge separations on such scales shouldn't be possible. Realistic charging mechanisms (e.g., high speeds in magnetic fields,4 or Debye sheaths), produce ionized particles, but the charge separations are local, and do not produce currents. Second, if a current did flow on such a scale, it would find less resistance in empty space than in dusty plasmas. Third, even if the current somehow preferred the resistance of the filament, and did consolidate some matter, it would do so selectively, on the basis of electric charge, where the greater the charge, the greater the magnetic pinch effect — yet the greater the charge, the more the Coulomb repulsion that will prevent condensation.
An alternative hypothesis is that electric currents are not causes of plasma collapse, but rather, they are effects. The cause is proposed to be the electric force in a "like-likes-like" configuration, where the net attraction in a series of filaments is greater than in a spherical dusty plasma of the same volume, due to the lack of opposing forces. The effect is that a spherical plasma might first resolve into filaments, and then the filaments might collapse. The movement of the quasi-neutral plasma then looks like an electric current, because opposite charges behave differently in motion.



1. Carlqvist, P. (1988): Cosmic electric currents and the generalized Bennett relation. Astrophysics and Space Science, 144 (1-2): 73-84

2. Verschuur, G. L. (1995): Interstellar Neutral Hydrogen Filaments at High Galactic Latitudes and the Bennett Pinch. Astrophysics and Space Science, 227 (1-2): 187-198

3. Peretto, N. et al. (2012): The Pipe Nebula as seen with Herschel: Formation of filamentary structures by large-scale compression? arXiv, astro-ph.GA: 1203.3403

4. Peratt, A. L.; Verschuur, G. L. (2000): Observation of the CIV effect in interstellar clouds: a speculation on the physical mechanism for their existence. IEEE Transactions on Plasma Science, 28 (6): 2122-2127

← PREV Powered by Quick Disclosure Lite
© 2010~2022 SCS-INC.US