Double Layers and Circuits in Astrophysics

  title={Double Layers and Circuits in Astrophysics},
  author={H. Alfv{\'e}n},
  journal={IEEE Transactions on Plasma Science},
  • H. Alfvén
  • Published 1986
  • Physics
  • IEEE Transactions on Plasma Science
As the rate of energy release in a double layer with voltage ¿V is P ¿ I¿V, a double layer must be treated as a part of a circuit which delivers the current I. As neither double layer nor circuit can be derived from magnetofluid models of a plasma, such models are useless for treating energy transfer by means of double layers. They must be replaced by particle models and circuit theory. A simple circuit is suggested which is applied to the energizing of auroral particles, to solar flares, and… Expand

Figures and Tables from this paper

Dynamical aspects of electrostatic double layers
Electrostatic double layers have been proposed as an acceleration mechanism in solar flares and other astrophysical objects. They have been extensively studied in the laboratory and by means ofExpand
The Evidence For Electrical Currents in Cosmic Plasma
With the advent of fully three-dimensional, fully electro- magnetic, particle-in-cell simulations, investigations of Birkeland cur- rents and magnetic-field-aligned electric fields have becomeExpand
The Effect of a Current Free Double Layer Below the Photosphere on the Acceleration of the Solar Wind
Neither the collisional hydrodynamic nor the collisionless kinetic models have yet been able to fully explain the acceleration of the fast solar wind without ad hoc assumptions of additional energyExpand
Quiet, Discrete Auroral Arcs: Acceleration Mechanisms
The theory of the acceleration of auroral particles is reviewed, focusing on developments in the last 15 years. We discuss elementary plasma physics processes leading to acceleration of electrons toExpand
A Solar Junction Transistor Mechanism
  • D. E. Scott
  • Physics
  • 2007 IEEE 34th International Conference on Plasma Science (ICOPS)
  • 2007
Summary form only given. Observational evidence suggests the presence of a plasma double layer (DL) above the surface of the Sun. Such a DL, together with a single charge layer (SL) directly belowExpand
Observations of propagating double layers in a high current discharge
Observations of current disruptions and strong electric fields along the magnetic field in a high-density (2×1019 m−3), highly-ionized, moving, and expanding plasma column are reported. The electricExpand
Electric space: Evolution of the plasma universe
Contrary to popular and scientific opinion of just a few decades ago, space is not an ‘empty’ void. It is actually filled with high energy particles, magnetic fields, and highly conducting plasma.Expand
Heliosheath Synchrotron Radiation As A Possible Source For The Arcade 2 CMB Distortions
This brief note speculates that the recently reported residual CMB signal [Seiffert et al 2009] may originate within the Sun's heliosheath. A temperature spectrum function is derived that has theExpand
Evolution of the Plasma Universe: I. Double Radio Galaxies, Quasars, and Extragalactic Jets
  • A. Peratt
  • Physics
  • IEEE Transactions on Plasma Science
  • 1986
Cosmic plasma physics and our concept of the universe is in a state of rapid revision. This change started with in-situ measurements of plasmas in Earth's ionosphere, cometary atmospheres, andExpand
Plasma acceleration, injection, and loss: Observational aspects
The sudden and dramatic acceleration of charged particles seems to be a universal phenomenon which occurs in plasmas occupying a wide range of spatial scales. These accelerations are typicallyExpand


On the Acceleration of Energetic Cosmic Particles by Electrostatic Double Layers
The capability of electrostatic double layers of accelerating charged particles to high energies is investigated. Starting from a one-dimensional relativistic double-layer model a two-dimensionalExpand
Paradigm Transition in Cosmic Plasma Physics
In situ measurements in the magnetospheres together with general advancement in plasma physics are now necessitating introduction of a number of effects that have been recently discovered or earlierExpand
On the physics of relativistic double layers
A model of a strong, time-independent, and relativistic double layer is studied. Besides double layers having the electric field parallel to the current the model also describes a certain type ofExpand
Numerical simulations on ion acoustic double layers
A comprehensive numerical study of ion acoustic double layers has been performed for both periodic and nonperiodic systems by means of one-dimensional particle simulations. For a nonperiodic system,Expand
A double layer review
A review is given of the main results on electrostatic double layers (sometimes called ‘space charge layers’ or ‘sheaths’) obtained from theory and laboratory and space experiments up to the springExpand
Properties of a fluctuating double layer in a magnetised plasma column
Wave phenomena at a strong electric double layer are investigated experimentally in a magnetised plasma column where the electron gyro frequency is smaller than the plasma frequency. FluctuationsExpand
High-voltage double layers in a magnetised plasma column
Observations of very strong double layers with potential drops up to 1 kV are reported. The experiments are made in a triple plasma device where a magnetised plasma column is maintained in theExpand
Observations of electric double layers in a magnetised plasma column
Strong electric double layers are produced in a low-density plasma column confined by an axial magnetic field and maintained by single-ended inflow of plasma along the magnetic field. The doubleExpand
Spontaneous transfer of magnetically stored energy to kinetic energy by electric double layers
Current disruptions may be excited spontaneously in a laboratory plasma when the electric current density along the magnetic field is large. This phenomenon is investigated in the plasma column of aExpand
Critique of fluid theory of magnetospheric phenomena
It is pointed out that the fluid theory has been successful in magnetospheric problems (such as the shape of the magnetopause) which involve basic considerations such as the conservation ofExpand