Another clue about particle acceleration in impulsive hard X-ray/microwave bursts

1994 ◽  
Vol 90 ◽  
pp. 697 ◽  
Author(s):  
David Batchelor
Keyword(s):  
Particle Acceleration ◽  
X Ray ◽  
Microwave Bursts

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 HIGH-ENERGY X-RAY IMAGING OF THE PULSAR WIND NEBULA MSH 15–52: CONSTRAINTS ON PARTICLE ACCELERATION AND TRANSPORT

2014 ◽  
Vol 793 (2) ◽  
pp. 90 ◽  
Author(s):  
Hongjun An ◽  
Kristin K. Madsen ◽  
Stephen P. Reynolds ◽  
Victoria M. Kaspi ◽  
Fiona A. Harrison ◽  
...  
Keyword(s):  
Particle Acceleration ◽  
High Energy ◽  
X Ray ◽  
X Ray Imaging ◽  
Pulsar Wind

scholarly journals Diagnostic Signatures of Radio and Hard X‐Ray Emission on Particle Acceleration Processes in the Coma Cluster

2003 ◽  
Vol 594 (2) ◽  
pp. 732-740 ◽  
Author(s):  
Ping‐Hung Kuo ◽  
Chorng‐Yuan Hwang ◽  
Wing‐Huen Ip
Keyword(s):  
Particle Acceleration ◽  
Coma Cluster ◽  
X Ray

Observations of Energetic Electrons in Solar Flares

1990 ◽  
Vol 142 ◽  
pp. 438-438
Author(s):  
B. Lokanadham
Keyword(s):  
Particle Acceleration ◽  
Energy Release ◽  
Observational Data ◽  
Solar Flares ◽  
Energetic Electrons ◽  
X Ray

A study of the simultaneous observations of solar flares in optical, radio and X-ray bands is important in understanding the process of energy release and particle acceleration in the explosive phenomena of solar flares. In order to determine the characteristics of such energetic electrons in solar flares, a total number of 50 two-ribbon flares have been carefully selected during the period 1979-89 having simultaneous observational data in the optical, X-ray and radio bands.

scholarly journals Solar Flare X-Ray Measurements and Their Relation to Microwave Bursts

1975 ◽  
Vol 68 ◽  
pp. 283-297 ◽  
Author(s):  
L. D. De Feiter
Keyword(s):  
Solar Flare ◽  
Source Region ◽  
X Ray ◽  
Observational Material ◽  
Microwave Bursts

This review discusses the available observational material of solar hard X-ray bursts, their interpretation in terms of a model of the source region and their relation with other flash-phase phenomena, in particular the impulsive microwave bursts.

Hard X-ray Emission and Efficient Particle Acceleration by Supernova Remnants

2009 ◽  
Author(s):  
Jacco Vink ◽  
Jéro^me Rodriguez ◽  
Phillippe Ferrando
Keyword(s):  
Particle Acceleration ◽  
Supernova Remnants ◽  
X Ray

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 X-Ray Measurements of the Particle Acceleration Properties at Inward Shocks in Cassiopeia A

2018 ◽  
Vol 853 (1) ◽  
pp. 46 ◽  
Author(s):  
Toshiki Sato ◽  
Satoru Katsuda ◽  
Mikio Morii ◽  
Aya Bamba ◽  
John P. Hughes ◽  
...  
Keyword(s):  
Particle Acceleration ◽  
X Ray ◽  
Cassiopeia A
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