scholarly journals Magneto-electrical orientation of lipid-coated graphitic micro-particles in solution

RSC Advances ◽  
2016 ◽  
Vol 6 (52) ◽  
pp. 46643-46653 ◽  
Author(s):  
Johnny Nguyen ◽  
Sonia Contera ◽  
Isabel Llorente García
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Static Magnetic Field ◽  
Time Varying ◽  
Micro Particles ◽  
First Time

We demonstrate, for the first time, confinement of the orientation of graphitic micro-flakes to a well-defined plane in solution by applying two perpendicular fields: a vertical static magnetic field and a horizontal time-varying electric field.

Influence of Electric Field and Temperature on Magnetic Field Induced Prolonged Changes of Electric Parameters of Silicon Systems

1995 ◽  
Vol 378 ◽  
Author(s):  
Vladimir M Maslovsky
Keyword(s):  
Magnetic Field ◽  
Diffusion Coefficient ◽  
Electric Field ◽  
Diffusion Activation Energy ◽  
Influence Of Temperature On ◽  
Electric Parameters ◽  
Generation Lifetime ◽  
Equilibrium Defects ◽  
First Time ◽  
Diffusion Activation

AbstractMagnetic field induced prolonged changes (MFIPC) of electric parameters of semiconductor systems is the phenomenon that has been recently established experimentally. In this work it is investigated for the first time the influence of electric field and temperature on duration of MFIPC of carrier generation lifetime in Si subsurface region and the influence of temperature on MFIPC of the MOS structure leakage voltage. The value of determined mobility of generated defects corresponds to the diffusion coefficient of vacancy -impurity complexes. These investigations of MFIPC of microstructure confirm that non-equilibrium defects reactions are limited by diffusion (in the absence of external electric field). It is shown that the corresponding diffusion coefficient is about 10−13 cm2s−1 and the magnitude of diffusion activation energy determined from these investigations is in the range 0.45–0.5 eV. This value is nearly the same as the diffusion coefficient of vacancy-impurity complex.

scholarly journals FRB coherent emission from decay of Alfvén waves

2020 ◽  
Vol 494 (2) ◽  
pp. 2385-2395 ◽  
Author(s):  
Pawan Kumar ◽  
Željka Bošnjak
Keyword(s):  
Magnetic Field ◽  
Wave Packet ◽  
Electric Field ◽  
Static Magnetic Field ◽  
Strong Electric Field ◽  
Alfven Waves ◽  
Alfven Wave ◽  
Alfvén Waves ◽  
Radio Waves ◽  
Electron Positron

ABSTRACT We present a model for fast radio bursts (FRBs) where a large-amplitude Alfvén wave packet is launched by a disturbance near the surface of a magnetar, and a substantial fraction of the wave energy is converted to coherent radio waves at a distance of a few tens of neutron star radii. The wave amplitude at the magnetar surface should be about 1011 G in order to produce an FRB of isotropic luminosity 1044 erg s−1. An electric current along the static magnetic field is required by Alfvén waves with non-zero component of transverse wave vector. The current is supplied by counter-streaming electron–positron pairs, which have to move at nearly the speed of light at larger radii as the plasma density decreases with distance from the magnetar surface. The counter-streaming pairs are subject to two-stream instability, which leads to formation of particle bunches of size of the order of c/ωp, where ωp is the plasma frequency. A strong electric field develops along the static magnetic field when the wave packet arrives at a radius where electron–positron density is insufficient to supply the current required by the wave. The electric field accelerates particle bunches along the curved magnetic field lines, and that produces the coherent FRB radiation. We provide a number of predictions of this model.

Drift wave in the presence of a time varying inhomogeneous electric field

1983 ◽  
Vol 61 (7) ◽  
pp. 1099-1105 ◽  
Author(s):  
K. D. Misra ◽  
R. P. Pandey ◽  
M. S. Tiwari
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Space Plasma ◽  
Time Varying ◽  
Inhomogeneous Electric Field ◽  
Drift Wave ◽  
Plane Normal ◽  
Vlasov Equations ◽  
Drift Instability ◽  
The Magnetic Field

The drift instability has been studied in the presence of an inhomogeneous time varying electric field directed perpendicular to the impressed magnetic field in the presence of a magnetic field, and density and temperature gradients, using nonlinear particle trajectories in the Maxwell–Boltzmann–Vlasov equations. The dispersion relation and growth rate have been evaluated for the drift wave propagating obliquely to the magnetic field in a plane normal to a density gradient. The stabilization/destabilization of the drift wave by the inhomogeneous applied electric field has been discussed. The application of these results has been suggested for space plasma.

scholarly journals Measuring the dayside reconnection rate during an interval of due northward interplanetary magnetic field

2004 ◽  
Vol 22 (12) ◽  
pp. 4243-4258 ◽  
Author(s):  
G. Chisham ◽  
M. P. Freeman ◽  
I. J. Coleman ◽  
M. Pinnock ◽  
M. R. Hairston ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Interplanetary Magnetic Field ◽  
Line Length ◽  
Hf Radar ◽  
Plasma Convection ◽  
Ionosphere Plasma ◽  
Reconnection Region ◽  
Field Lines ◽  
First Time

Abstract. This study presents, for the first time, detailed spatiotemporal measurements of the reconnection electric field in the Northern Hemisphere ionosphere during an extended interval of northward interplanetary magnetic field. Global convection mapping using the SuperDARN HF radar network provides global estimates of the convection electric field in the northern polar ionosphere. These are combined with measurements of the ionospheric footprint of the reconnection X-line to determine the spatiotemporal variation of the reconnection electric field along the whole X-line. The shape of the spatial variation is stable throughout the interval, although its magnitude does change with time. Consequently, the total reconnection potential along the X-line is temporally variable but its typical magnitude is consistent with the cross-polar cap potential measured by low-altitude satellite overpasses. The reconnection measurements are mapped out from the ionosphere along Tsyganenko model magnetic field lines to determine the most likely reconnection location on the lobe magnetopause. The X-line length on the lobe magnetopause is estimated to be ~6–11 RE in extent, depending on the assumptions made when determining the length of the ionospheric X-line. The reconnection electric field on the lobe magnetopause is estimated to be ~0.2mV/m in the peak reconnection region. Key words. Space plasma physics (Magnetic reconnection) – Magnetospheric physics (Magnetopause, cusp and boundary layers) – Ionosphere (Plasma convection)

Vectorial Impedance Identity for the Natural Dependence of Harmonic Fields on Closed Boundaries

1975 ◽  
Vol 53 (15) ◽  
pp. 1404-1407 ◽  
Author(s):  
O. A. Aboul-Atta ◽  
W. M. Boerner
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Inverse Scattering ◽  
Field Solution ◽  
Tangential Electric Field ◽  
First Time ◽  
Scalar Equations ◽  
Harmonic Electromagnetic Field ◽  
Exact Description

The exact description of the harmonic electromagnetic field solution at scattering surfaces is shown to require, in general, two impedances to relate the tangential electric field to the tangential magnetic field. The consequences lead to the generation of two independent surface vectors that are orthogonal, of equal norm, and have a realizable direction. They are used to describe the surface by two scalar equations. For the first time, the details of this vectorial impedance identity, the derivation of those two vectors, and the two scalar inverse scattering surface equations are shown.

Sign in / Sign up

Export Citation Format

Share Document