Accumulation of magnetic field energy in an active region due to the alpha-effect

1996 ◽  
Vol 39 (11-12) ◽  
pp. 930-934
Author(s):  
V. I. Abramenko ◽  
V. B. Yurchishin ◽  
T. J. Wang
Keyword(s):  
Magnetic Field ◽  
Active Region ◽  
Field Energy ◽  
Magnetic Field Energy ◽  
Alpha Effect

scholarly journals Finite size scaling in the solar wind magnetic field energy density as seen by WIND

2002 ◽  
Vol 29 (10) ◽  
pp. 86-1-86-4 ◽  
Author(s):  
B. Hnat ◽  
S. C. Chapman ◽  
G. Rowlands ◽  
N. W. Watkins ◽  
W. M. Farrell
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Energy Density ◽  
Finite Size ◽  
Field Energy ◽  
Finite Size Scaling ◽  
Size Scaling ◽  
Magnetic Field Energy ◽  
Solar Wind Magnetic Field ◽  
Field Energy Density

scholarly journals A shear-mode magnetoelectric heterostructure for harvesting external magnetic field energy

2017 ◽  
Vol 59 ◽  
pp. 012027
Author(s):  
Wei He ◽  
Jitao Zhang ◽  
Yueran Lu ◽  
Aichao Yang ◽  
Chiwen Qu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Field Energy ◽  
Shear Mode ◽  
Magnetic Field Energy

scholarly journals The Formation of Discontinuities in Gas Flows in the ISM and its Relation to the Galactic Synchrotron Radio Emission

1990 ◽  
Vol 140 ◽  
pp. 159-162
Author(s):  
V.G. Berman ◽  
L.S. Marochnik ◽  
Yu.N. Mishurov ◽  
A.A. Suchkov
Keyword(s):  
Magnetic Field ◽  
Cosmic Rays ◽  
Radio Emission ◽  
Large Scale ◽  
Field Energy ◽  
Gas Flows ◽  
Interstellar Gas ◽  
Gas Density ◽  
Magnetic Field Energy ◽  
Wide Range

We show that large–scale motions of the interstellar gas, such as those associated with galactic density waves, easily develop, over a wide range of scales, shocks and discontinuities which are expected to generate turbulence. The latter is supposed to evoke diffusion of magnetic fields and cosmic rays on scales down to a few parsecs. We suggest that these processes may be of major importance in discussions of interconnections between the observed radio emission of the disks of spiral galaxies and the gas density distribution within them. In particular, we predict that the density of cosmic rays and magnetic field energy must be much less contrasted (on scales of ~1 pc and up to the scales of galactic shocks) than the gas density, hence the synchrotron radio emission is not as contrasted as is predicted under the hypothesis of a fully frozen-in magnetic field.

Nonlinear resonant tunneling in low-dimensional systems in a magnetic field: Energy dispersion

2006 ◽  
Vol 34 (1-2) ◽  
pp. 425-428 ◽  
Author(s):  
S.K. Lyo ◽  
E. Bielejec ◽  
J.A. Seamons ◽  
J.L. Reno ◽  
M.P. Lilly ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Resonant Tunneling ◽  
Field Energy ◽  
Energy Dispersion ◽  
Magnetic Field Energy ◽  
Low Dimensional

A mechanism for X-ray production in Sco X-1

1969 ◽  
Vol 313 (1514) ◽  
pp. 395-402 ◽  
Keyword(s):  
Magnetic Field ◽  
Particle Acceleration ◽  
Magnetoactive Plasma ◽  
Cosmic Ray ◽  
Field Energy ◽  
Close Collaboration ◽  
Ionized Gas ◽  
X Ray ◽  
Magnetic Field Energy ◽  
Cosmic Ray Acceleration

In this brief talk I should like to present a summary of some recent results on the mechanism of X -ray production in extars, with special emphasis on Sco X-1. These results are an outcome of a close collaboration between Professor S. Olbert of M.I.T. and me. As mentioned by Professor Burbidge earlier today, we hypothesize that galactic X-ray sources are in fact entities wherein ‘frozen in’, compressed magnetic field rapidly relaxes by transferring magnetic field energy to ultrarelativistic (u.r.) electrons. Consider a volume of space filled with magnetoactive plasma. For reasons elaborated on elsewhere (Manley & Olbert 1968, 1969) we do not expect the ionized gas to be homogeneous. Rather we expect it to consist of an aggregate of long thin plasmoids acting almost independently of one another. We now postulate the presence of random Alfvén waves (m.h.d. noise) propagating back and forth, along the plasmoids, and inquire into the possibility of charged particle acceleration by interaction with these noisy plasmoids. This is akin to the cosmic ray acceleration mechanism proposed by Fermi, who however, considered only interactions with large, approximately spherical plasmoids.

scholarly journals PRESSURE OF DEGENERATE AND RELATIVISTIC ELECTRONS IN A SUPERHIGH MAGNETIC FIELD

2013 ◽  
Vol 28 (36) ◽  
pp. 1350138 ◽  
Author(s):  
ZHI FU GAO ◽  
NA WANG ◽  
QIU HE PENG ◽  
XIANG DONG LI ◽  
YUAN JIE DU
Keyword(s):  
Magnetic Field ◽  
Oblate Spheroid ◽  
Field Energy ◽  
Relativistic Electrons ◽  
Positive Contribution ◽  
High Electron ◽  
Electron Pressure ◽  
Magnetic Field Energy ◽  
Qed Effects ◽  
The Magnetic Field

Based on our previous work, we deduce a general formula for pressure of degenerate and relativistic electrons, Pe, which is suitable for superhigh magnetic fields, discuss the quantization of Landau levels of electrons, and consider the quantum electrodynamic (QED) effects on the equations of states (EOSs) for different matter systems. The main conclusions are as follows: Pe is related to the magnetic field B, matter density ρ, and electron fraction Ye; the stronger the magnetic field, the higher the electron pressure becomes; the high electron pressure could be caused by high Fermi energy of electrons in a superhigh magnetic field; compared with a common radio pulsar, a magnetar could be a more compact oblate spheroid-like deformed neutron star (NS) due to the anisotropic total pressure; and an increase in the maximum mass of a magnetar is expected because of the positive contribution of the magnetic field energy to the EOS of the star.

scholarly journals Fast magnetic energy dissipation in relativistic plasma induced by high order laser modes

2016 ◽  
Vol 4 ◽  
Author(s):  
Y. J. Gu ◽  
Q. Yu ◽  
O. Klimo ◽  
T. Zh. Esirkepov ◽  
S. V. Bulanov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Magnetic Energy ◽  
Collisionless Plasma ◽  
High Energy ◽  
Field Energy ◽  
Displacement Current ◽  
Particle In Cell ◽  
Magnetic Field Energy ◽  
High Energy Electrons

Fast magnetic field annihilation in a collisionless plasma is induced by using TEM(1,0) laser pulse. The magnetic quadrupole structure formation, expansion and annihilation stages are demonstrated with 2.5-dimensional particle-in-cell simulations. The magnetic field energy is converted to the electric field and accelerate the particles inside the annihilation plane. A bunch of high energy electrons moving backwards is detected in the current sheet. The strong displacement current is the dominant contribution which induces the longitudinal inductive electric field.

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