scholarly journals The generation of magnetic fields by the Weibel instability

2006 ◽  
Vol 327 (5-6) ◽  
pp. 443-447 ◽  
Author(s):  
Y. Fujita ◽  
T. N. Kato
Keyword(s):  
Magnetic Fields ◽  
Weibel Instability

scholarly journals The generation of magnetic fields by the Biermann battery and the interplay with the Weibel instability

2016 ◽  
Vol 23 (5) ◽  
pp. 056304 ◽  
Author(s):  
K. M. Schoeffler ◽  
N. F. Loureiro ◽  
R. A. Fonseca ◽  
L. O. Silva
Keyword(s):  
Magnetic Fields ◽  
Weibel Instability ◽  
Biermann Battery

scholarly journals PARTICLE ACCELERATION, MAGNETIC FIELD GENERATION, AND ASSOCIATED EMISSION IN COLLISIONLESS RELATIVISTIC JETS

2008 ◽  
Vol 17 (10) ◽  
pp. 1761-1767 ◽  
Author(s):  
K.-I. NISHIKAWA ◽  
Y. MIZUNO ◽  
G. J. FISHMAN ◽  
P. HARDEE
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Small Scale ◽  
Spectral Structure ◽  
Relativistic Jets ◽  
Weibel Instability ◽  
Electron Positron ◽  
Jitter Radiation

Nonthermal radiation observed from astrophysical systems containing relativistic jets and shocks, e.g., active galactic nuclei (AGNs), gamma-ray bursts (GRBs), and galactic microquasar systems usually have power-law emission spectra. Recent PIC simulations using injected relativistic electron-ion (electron-positron) jets show that acceleration occurs within the downstream jet. Shock acceleration is an ubiquitous phenomenon in astrophysical plasmas. Plasma waves and their associated instabilities (e.g., the Buneman instability, other two-streaming instability, and the Weibel instability) created in the shocks are responsible for particle (electron, positron, and ion) acceleration. The simulation results show that the Weibel instability is responsible for generating and amplifying highly nonuniform, small-scale magnetic fields. These magnetic fields contribute to the electrons' transverse deflection behind the jet head. The "jitter" radiation from deflected electrons has different properties to synchrotron radiation which assumes a uniform magnetic field. This jitter radiation may be important to understanding the complex time evolution and/or spectral structure in gamma-ray bursts, relativistic jets, and supernova remnants.

Evolution of filaments and associated magnetic fields produced by the Weibel Instability in two counterstreaming laser plasmas

2018 ◽  
Vol 25 (6) ◽  
pp. 062123
Author(s):  
Hui-Ya Liu ◽  
Quan-Li Dong ◽  
Sheng-Zhe Ji ◽  
Ning Kang ◽  
Shen-Lei Zhou ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Weibel Instability ◽  
Laser Plasmas

scholarly journals Weibel instability by ultraintense laser pulses

1999 ◽  
Vol 17 (3) ◽  
pp. 515-518 ◽  
Author(s):  
T. OKADA ◽  
I. SAJIKI ◽  
K. SATOU
Keyword(s):  
Magnetic Fields ◽  
Velocity Distribution ◽  
Electromagnetic Waves ◽  
Laser Pulses ◽  
Electron Velocity ◽  
Electron Velocity Distribution ◽  
Loss Mechanism ◽  
Weibel Instability ◽  
Particle In Cell ◽  
Underdense Plasmas

Particle-in-cell (PIC) simulations show that an anisotropic electron velocity distribution is demonstrated by ultraintense laser pulses in underdense plasmas. Recently, it is reported that the anisotropy has been experimentally demonstrated in laser-produced plasmas. It is also pointed out that gigagauss magnetic fields are generated by ultraintense laser pulses. We have already published that the Weibel-type electromagnetic instabilities can be theoretically excited by electrons in a velocity distribution with anisotropic temperature. If these electromagnetic waves are excited, the target may have a possibility not only to give rise to a new type of energy loss mechanism but also to influence the implosion characteristics. In this work, we present PIC simulation of the interaction of ultraintense laser pulses with plasmas. Intense self-generated magnetic fields is produced by the mechanism of Weibel instability in underdense plasmas.

scholarly journals RADIATION FROM RELATIVISTIC SHOCKS WITH TURBULENT MAGNETIC FIELDS

2010 ◽  
Vol 19 (06) ◽  
pp. 715-721 ◽  
Author(s):  
K.-I. NISHIKAWA ◽  
J. NIMIEC ◽  
M. MEDVEDEV ◽  
B. ZHANG ◽  
P. HARDEE ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Particle Acceleration ◽  
Magnetic Fields ◽  
Weibel Instability ◽  
Pair Plasma ◽  
Nonlinear Stage ◽  
Relativistic Shocks ◽  
Electron Positron ◽  
Ambient Electron

Using our new 3D relativistic electromagnetic particle (REMP) code parallelized with MPI, we investigated long-term particle acceleration associated with a relativistic electron–positron jet propagating in an unmagnetized ambient electron–positron plasma. We have also performed simulations with electron-ion jets. The simulations were performed using a much longer simulation system than our previous simulations in order to investigate the full nonlinear stage of the Weibel instability for electron–positron jets and its particle acceleration mechanism. Cold jet electrons are thermalized and ambient electrons are accelerated in the resulting shocks for pair plasma case. Acceleration of ambient electrons leads to a maximum ambient electron density three times larger than the original value for pair plasmas. Behind the bow shock in the jet shock strong electromagnetic fields are generated. These fields may lead to time-dependent afterglow emission. We calculated radiation from electrons propagating in a uniform parallel magnetic field to verify the technique. We also used the new technique to calculate emission from electrons based on simulations with a small system with two different cases for Lorentz factors (15 and 100). We obtained spectra which are consistent with those generated from electrons propagating in turbulent magnetic fields with red noise. This turbulent magnetic field is similar to the magnetic field generated at an early nonlinear stage of the Weibel instability.

scholarly journals Relativistic Jet Simulations of the Weibel Instability in the Slab Model to Cylindrical Jets with Helical Magnetic Fields

2018 ◽  
Author(s):  
Kenichi Nishikawa ◽  
Yosuke Mizuno ◽  
Jose L. Gomez ◽  
Ioana Dutan ◽  
Athina Meli ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Relativistic Jets ◽  
Astrophysical Plasmas ◽  
Weibel Instability ◽  
Particle In Cell ◽  
Relativistic Shocks ◽  
Relativistic Jet ◽  
The Us ◽  
Solar Plasmas ◽  
Pic Method

The Particle-In-Cell (PIC) method has been developed in order to investigate microscopic phenomena, and with the advances of computing power, newly developed codes have been used for several fields such as astrophysical, magnetospheric, and solar plasmas. Its applications have grown extensively with large computing powers available such as Pleiades and Blue Water systems in the US. For astrophysical plasmas research PIC method has been utilized in several topics such as reconnection, pulsar, non-relativistic shocks, relativistic shocks, relativistic jets, etc. As one of the research topics in astrophysics, PIC simulations of relativistic jets are reviewed up to the present time with the emphasis on the physics involved in the simulations. In this review we summarize PIC simulations starting with the Weibel instability in slab models of jets and then, continuing with recent progresses on global jets with helical magnetic fields including kinetic Kelvin-Helmholtz instabilities and mushroom instabilities.

Distinguishing and diagnosing the spontaneous electric and magnetic fields of Weibel instability through proton radiography

2019 ◽  
Vol 62 (2) ◽  
pp. 025017
Author(s):  
Bao Du ◽  
Hong-Bo Cai ◽  
Wen-Shuai Zhang ◽  
Jian-Min Tian ◽  
En-Hao Zhang ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Proton Radiography ◽  
Weibel Instability ◽  
Electric And Magnetic Fields

scholarly journals Observation of resistive Weibel instability in intense laser plasma

2020 ◽  
Vol 38 (2) ◽  
pp. 152-158 ◽  
Author(s):  
S. Krishnamurthy ◽  
K. Makur ◽  
B. Ramakrishna
Keyword(s):  
Magnetic Fields ◽  
Proton Beam ◽  
Laser Plasma ◽  
Inertial Confinement Fusion ◽  
Dense Plasma ◽  
Intense Laser ◽  
Inertial Confinement ◽  
Weibel Instability ◽  
Plasma Effects ◽  
Confinement Fusion

AbstractWe observe experimentally periodic proton beam filamentation in laser-produced dense plasma using multilayered (CH–Al–CH) sandwich targets. The accelerated MeV proton beams from these targets exhibit periodic frozen filaments up to 5–10 µm as a result of resistive Weibel instabilities in the expanding plasma. The evolution of strong self-generated resistive magnetic fields at the targets interface is attributed to such plasma effects, which are supported, by our theory and simulations. We suggest that the resistive Weibel instability could be effectively employed to understand the evolution of magnetic fields in laser-generated plasma in the astrophysics scenario or the advanced fast igniter approach of the inertial confinement fusion.

scholarly journals Electron Weibel instability in relativistic counterstreaming plasmas with flow-aligned external magnetic fields

2017 ◽  
Vol 95 (2) ◽  
Author(s):  
A. Grassi ◽  
M. Grech ◽  
F. Amiranoff ◽  
F. Pegoraro ◽  
A. Macchi ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Weibel Instability

Calculated Coronal Magnetic Fields and Their Comparison with the Coronal Structures as Observed during Five Solar Eclipses

1994 ◽  
Vol 144 ◽  
pp. 559-564
Author(s):  
P. Ambrož ◽  
J. Sýkora
Keyword(s):  
Magnetic Field ◽  
Solar Cycle ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Coronal Magnetic Field ◽  
Coronal Magnetic Fields ◽  
Solar Eclipses ◽  
Coronal Structures

AbstractWe were successful in observing the solar corona during five solar eclipses (1973-1991). For the eclipse days the coronal magnetic field was calculated by extrapolation from the photosphere. Comparison of the observed and calculated coronal structures is carried out and some peculiarities of this comparison, related to the different phases of the solar cycle, are presented.

Sign in / Sign up

Export Citation Format

Share Document