scholarly journals DIFFUSIVE ACCELERATION OF PARTICLES AT OBLIQUE, RELATIVISTIC, MAGNETOHYDRODYNAMIC SHOCKS

2011 ◽  
Vol 745 (1) ◽  
pp. 63 ◽  
Author(s):  
Errol J. Summerlin ◽  
Matthew G. Baring
Keyword(s):  
Acceleration Of Particles ◽  
Diffusive Acceleration ◽  
Magnetohydrodynamic Shocks

scholarly journals Detection of Magnetohydrodynamic Shocks in the L1551 Outflow

1994 ◽  
Vol 140 ◽  
pp. 222-223
Author(s):  
M. Barsony ◽  
N. Z. Scoville ◽  
C. J. Chandler
Keyword(s):  
Near Infrared ◽  
Resolution Single ◽  
Shock Fronts ◽  
Magnetohydrodynamic Shocks

AbstractWe report the results of CO J=l—+0 mapping of portions of the blue outflow lobe of L1551 with ~ 7” (N-S) × 4” (E-W) resolution, obtained with the 3-element OVRO millimeter array. Comparison of our interferometer mosaic with lower resolution single-dish data shows that we resolve the strongest single-dish emission regions into filamentary structures, such as are characteristic of shock fronts mapped via their near-infrared H2 emission in other outflow sources.

Stability of Plane Magnetohydrodynamic Shocks

1964 ◽  
Vol 7 (5) ◽  
pp. 700 ◽  
Author(s):  
C. S. Gardner ◽  
M. D. Kruskal
Keyword(s):  
Magnetohydrodynamic Shocks

scholarly journals ACCELERATION OF PARTICLES BY THE FIELDS OF WAVE PACKETS

2019 ◽  
pp. 43-46
Author(s):  
V.А. Buts ◽  
V.V. Kuzmin ◽  
A.P. Tolstoluzhsky
Keyword(s):  
Wave Packet ◽  
Wave Packets ◽  
Dynamic Chaos ◽  
Acceleration Of Particles ◽  
Nonlinear Resonances ◽  
Dynamics Of Particles

The dynamics of particles in the field of a wave packet excited in a plasma is considered. The conditions are found under which such dynamics is regular, and when it becomes chaotic. It was found that the well-known (phenomenological) criterion for the emergence of dynamic chaos − the criterion for overlapping Chirikov nonlinear resonances − requires careful use.

scholarly journals Particle Orbits, Trapping, and Acceleration in a Filamentary Current Sheet Model

1994 ◽  
Vol 142 ◽  
pp. 719-728
Author(s):  
Bernhard Kliem
Keyword(s):  
Particle Acceleration ◽  
Electric Field ◽  
Test Particle ◽  
Solar Flares ◽  
Acceleration Of Particles ◽  
Acceleration Process ◽  
Two Dimensional ◽  
Magnetic Island ◽  
Particle Orbits ◽  
Island Dynamics

AbstractTest particle orbits in the two-dimensional Fadeev equilibrium with a perpendicular electric field added are analyzed to show that impulsive bursty reconnection, which has been proposed as a model for fragmentary energy release in solar flares, may account also for particle acceleration to (near) relativistic energies within a fraction of a second. The convective electric field connected with magnetic island dynamics can play an important role in the acceleration process.Subject headings: acceleration of particles — MHD — plasmas — Sun: corona — Sun: flares

scholarly journals Acceleration Processes for Gamma-Ray Bursts

1994 ◽  
Vol 142 ◽  
pp. 869-876 ◽  
Author(s):  
Igor G. Mitrofanov
Keyword(s):  
Particle Acceleration ◽  
Electric Field ◽  
Neutron Stars ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Initial Energy ◽  
Gamma Ray Bursts ◽  
Acceleration Of Particles ◽  
Radiation Mechanisms ◽  
Radiative Pressure

AbstractIs it shown that for those astronomical models of cosmic gamma-ray bursts (GRBs) which are associated with galactic neutron stars (NSs), the initial energy of the outburst could be converted to gamma-rays through processes of particle acceleration. The main emission mechanisms are considered for two basic alternatives, when particles are accelerated either by radiative pressure or by an electric field.Subject headings: acceleration of particles — gamma rays: bursts — radiation mechanisms: nonthermal

scholarly journals Another Clue About Particle Acceleration in Impulsive Hard X-Ray/Microwave Bursts

1994 ◽  
Vol 142 ◽  
pp. 697-700
Author(s):  
David Batchelor
Keyword(s):  
Thermal Conduction ◽  
Microwave Emission ◽  
Spectral Information ◽  
Acceleration Of Particles ◽  
X Rays ◽  
Radio Radiation ◽  
X Ray ◽  
Structure And Dynamics ◽  
Source Structure ◽  
Microwave Bursts

AbstractIn a sample of impulsive bursts with rise times less than 30 s, a correlation between burst rise times and the frequency of maximum microwave emission has been found. The implications for source structure and dynamics are discussed in this paper. Previously evidence was found that such bursts are caused by some propagating disturbance such as a shock wave or thermal conduction front. Combining that evidence with the microwave and hard X-ray spectral information suggests that the most rapid bursts are emitted from the most compact and intensely magnetized sources. The most rapid bursts also exhibited the hardest X-ray spectra, as published previously. These facts are important clues to understanding the physical process responsible for impulsive bursts. A model for the bursts is suggested, based on the observations and inferences described.Subject headings: acceleration of particles — Sun: radio radiation — X-rays: bursts

scholarly journals Evidence for Particle Acceleration During Magnetospheric Substorms

1994 ◽  
Vol 142 ◽  
pp. 531-539
Author(s):  
Ramon E. Lopez ◽  
Daniel N. Baker
Keyword(s):  
Solar Wind ◽  
Particle Acceleration ◽  
Energy Release ◽  
Acceleration Of Particles ◽  
Magnetospheric Substorms ◽  
Geomagnetic Tail ◽  
Dissipation Of Energy ◽  
In Situ Observations ◽  
Current Systems

AbstractMagnetospheric substorms represent the episodic dissipation of energy stored in the geomagnetic tail that was previously extracted from the solar wind. This energy release produces activity throughout the entire magnetosphere-ionosphere system, and it results in a wide variety of phenomena such as auroral intensifications and the generation of new current systems. All of these phenomena involve the acceleration of particles, sometimes up to several MeV. In this paper we present a brief overview of substorm phenomenology. We then review some of the evidence for particle acceleration in Earth’s magnetosphere during substorms. Such in situ observations in this most accessible of all cosmic plasma domains may hold important clues to understanding acceleration processes in more distant astrophysical systems.Subject headings: acceleration of particles — Earth — solar wind

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