scholarly journals Particle Acceleration and Radiation in Magnetospheres of Collapsing Stars

2000 ◽  
Vol 195 ◽  
pp. 403-406
Author(s):  
V. Kryvdyk
Keyword(s):  
Magnetic Fields ◽  
Energy Distribution ◽  
Power Law ◽  
Charged Particles ◽  
Particle Dynamics ◽  
Initial Energy ◽  
Particle Energy ◽  
Radiation Fluxes ◽  
Nonthermal Emission ◽  
Initial Power

Particle dynamics and nonthermal emission therefrom in the magnetospheres of collapsing stars with initial dipole magnetic fields and a certain initial energy distribution of charged particles (power-law, relativistic Maxwell, and Boltzmann distributions) are considered. The radiation fluxes are calculated for various collapsing stars with initial dipole magnetic fields and an initial power-law particle energy distribution in the magnetosphere. The effects can be observed by means of modern instruments.

Synchrotron Radiation Spectra

1972 ◽  
Vol 2 (3) ◽  
pp. 142-144 ◽  
Author(s):  
L. J. Gleeson ◽  
K. C. Westfold
Keyword(s):  
Magnetic Field ◽  
Synchrotron Radiation ◽  
Energy Distribution ◽  
Power Law ◽  
Uniform Magnetic Field ◽  
Charged Particles ◽  
Radiation Spectra ◽  
Field Lines

In this paper we give an account of the corrections that must be made to the formula for the emissivity ηf due to a power-law energy distribution of ultrarelativistic charged particles in a uniform magnetic field B0 in directions well away from the field lines when the effects of upper and lower cut-off values E2 and E1 in the energy distribution are not negligible.

Gestural Articulations of Embodied Spatiality

2015 ◽  
pp. 233-256
Author(s):  
Lai Har Judy Lee ◽  
Yam San Chee
Keyword(s):  
Charged Particle ◽  
Magnetic Fields ◽  
Charged Particles ◽  
Particle Dynamics ◽  
Frame Of Reference ◽  
Game Based Learning ◽  
Design Based Research ◽  
3D Game ◽  
Electric And Magnetic Fields ◽  
Game Environment

The work described in this paper is part of a design-based research involving the use of a game-based learning curriculum to foster students' understanding of physics concepts and principles governing the motion of charged particles in electric and magnetic fields. Students engaged in game-play and discussed the dynamics of the charged particles within the 3D game environment. The discussion sessions were video-recorded and an analysis was carried out on the gestures used by a group of students attempting to generalize their observations of the phenomena. The students' gestures were analyzed to gain insights on their embodied sense-making of charged particle dynamics. The analysis showed that the students used gestures to (1) establish a shared frame of reference, (2) enact embodied game experience, and (3) enable the development of new understanding that surpasses their own existing vocabulary. Implications are discussed with regard to how teachers may take students' gestures into account when facilitating the development of concepts with a strong visuo-spatial core.

scholarly journals Turbulence and Particle Acceleration in a Relativistic Plasma

2022 ◽  
Vol 924 (1) ◽  
pp. L19
Author(s):  
Cristian Vega ◽  
Stanislav Boldyrev ◽  
Vadim Roytershteyn ◽  
Mikhail Medvedev
Keyword(s):  
Distribution Function ◽  
Energy Distribution ◽  
Power Law ◽  
Numerical Study ◽  
Collisionless Plasma ◽  
Plasma Temperature ◽  
Particle Energy ◽  
Energy Distribution Function ◽  
Scaling Exponent ◽  
Magnetic Perturbations

Abstract In a collisionless plasma, the energy distribution function of plasma particles can be strongly affected by turbulence. In particular, it can develop a nonthermal power-law tail at high energies. We argue that turbulence with initially relativistically strong magnetic perturbations (magnetization parameter σ ≫ 1) quickly evolves into a state with ultrarelativistic plasma temperature but mildly relativistic turbulent fluctuations. We present a phenomenological and numerical study suggesting that in this case, the exponent α in the power-law particle-energy distribution function, f(γ)d γ ∝ γ −α d γ, depends on magnetic compressibility of turbulence. Our analytic prediction for the scaling exponent α is in good agreement with the numerical results.

Particle Motions in Planetary Magnetic Fields: Europlanet Service

2020 ◽  
Author(s):  
Patrick Guio ◽  
Nicholas Achilleos ◽  
Nicolas André
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Charged Particles ◽  
High Energy ◽  
Particle Energy ◽  
Curvature Radius ◽  
High Energy Particle ◽  
Field Curvature ◽  
Planetary Magnetic Fields ◽  
Field Lines

<p>The trapping of charged particles in planetary magnetic fields is a process which underpins many important aspects of planetary magnetospheres, such as ring current evolution, particle acceleration, and the flow of current through the system, both free and bound. As part of our effort for the Europlanet project, the UCL group have developed codes which accurately model the trajectories of charged particles in magnetic field models appropriate for the magnetospheres of Jupiter and Saturn. These will form the basis of a service for the SPIDER task. In this presentation, we show examples of ion trajectories at both planets for representative 'start values' of equatorial distance, pitch angle, and values of particle energy. The simulations provide an indication of how particle orbits become less adiabatic as one approaches energies where gyroradii become comparable to magnetic field curvature radius. The disk-like fields of the gas giants are particularly effective at 'scattering' adequately high-energy particle trajectories as they cross the equator, where the field lines are most 'pinched' and have the smallest length scales.</p>

scholarly journals Widening and distortion of the particle energy distribution by chromaticity in quasi-isochronous rings

2020 ◽  
Vol 23 (4) ◽  
Author(s):  
X. J. Deng ◽  
R. Klein ◽  
A. W. Chao ◽  
A. Hoehl ◽  
W. H. Huang ◽  
...  
Keyword(s):  
Energy Distribution ◽  
Particle Energy

ENERGY ORDERING EFFECTS IN THE ARRIVAL DIRECTIONS OF ULTRA-HIGH ENERGY COSMIC RAYS MEASURED BY THE PIERRE AUGER OBSERVATORY

2011 ◽  
Vol 20 (supp02) ◽  
pp. 50-56
Author(s):  
◽  
PETER SCHIFFER
Keyword(s):  
Cosmic Rays ◽  
Magnetic Fields ◽  
Charged Particles ◽  
High Energy ◽  
Pierre Auger Observatory ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays ◽  
Ordering Effects ◽  
Arrival Directions

The Pierre Auger Observatory is the world's largest experiment for the measurement of ultra-high energy cosmic rays (UHECRs). These UHECRs are assumed to be to be charged particles, and thus are deflected in cosmic magnetic fields. Recent results of the Pierre Auger Observatory addressing the complex of energy ordering of the UHECRs arrival directions are reviewed in this contribution. So far no significant energy ordering has been observed.

Energy distribution over the cross section of the track of charged particles having the same linear energy transfer

1973 ◽  
Vol 34 (4) ◽  
pp. 372-373
Author(s):  
I. K. Kalugina ◽  
I. B. Keirim-Markus ◽  
A. K. Savinskii ◽  
I. V. Filyushkin
Keyword(s):  
Energy Transfer ◽  
Energy Distribution ◽  
Cross Section ◽  
Linear Energy Transfer ◽  
Charged Particles ◽  
The Cross
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