scholarly journals Global Dynamics of the Interstellar Gas, Magnetic Field, and Cosmic Rays

1978 ◽  
Vol 77 ◽  
pp. 57-65
Author(s):  
E. H. Levy
Keyword(s):  
Magnetic Field ◽  
Cosmic Rays ◽  
Radio Emission ◽  
Composite System ◽  
Global Dynamics ◽  
Interstellar Gas ◽  
Dynamical Equilibrium ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission ◽  
Physical Principles

I have been asked to review the physical principles which underlie the dynamical equilibrium and stability of a composite system of gas, magnetic field, and cosmic rays. What is of particular concern here are those aspects which control the distribution of magnetic field and cosmic rays, and thus influence the morphology of galaxies as seen in nonthermal radio emission.

scholarly journals The Formation of Discontinuities in Gas Flows in the ISM and its Relation to the Galactic Synchrotron Radio Emission

1990 ◽  
Vol 140 ◽  
pp. 159-162
Author(s):  
V.G. Berman ◽  
L.S. Marochnik ◽  
Yu.N. Mishurov ◽  
A.A. Suchkov
Keyword(s):  
Magnetic Field ◽  
Cosmic Rays ◽  
Radio Emission ◽  
Large Scale ◽  
Field Energy ◽  
Gas Flows ◽  
Interstellar Gas ◽  
Gas Density ◽  
Magnetic Field Energy ◽  
Wide Range

We show that large–scale motions of the interstellar gas, such as those associated with galactic density waves, easily develop, over a wide range of scales, shocks and discontinuities which are expected to generate turbulence. The latter is supposed to evoke diffusion of magnetic fields and cosmic rays on scales down to a few parsecs. We suggest that these processes may be of major importance in discussions of interconnections between the observed radio emission of the disks of spiral galaxies and the gas density distribution within them. In particular, we predict that the density of cosmic rays and magnetic field energy must be much less contrasted (on scales of ~1 pc and up to the scales of galactic shocks) than the gas density, hence the synchrotron radio emission is not as contrasted as is predicted under the hypothesis of a fully frozen-in magnetic field.

scholarly journals Evidence of a Weak Galactic Center Magnetic Field from Diffuse Low-Frequency Nonthermal Radio Emission

2005 ◽  
Vol 626 (1) ◽  
pp. L23-L27 ◽  
Author(s):  
T. N. LaRosa ◽  
C. L. Brogan ◽  
S. N. Shore ◽  
T. J. Lazio ◽  
N. E. Kassim ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Radio Emission ◽  
Galactic Center ◽  
Low Frequency ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission

scholarly journals On the Relationship Between Recent Measurements of Cosmic Ray Electrons, Nonthermal Radio Emission from the Galaxy, and the Solar Modulation of Cosmic Rays

1968 ◽  
Vol 21 (6) ◽  
pp. 845 ◽  
Author(s):  
WR Webber
Keyword(s):  
Cosmic Rays ◽  
Radio Emission ◽  
Electron Spectrum ◽  
Cosmic Ray ◽  
Solar Modulation ◽  
Nonthermal Radio ◽  
The Galaxy ◽  
Nonthermal Radio Emission ◽  
Modulation Parameter ◽  
The Relationship

Utilizing recent measurements of the cosmic ray electron spectrum at the Earth and the effects of solar modulation on this spectrum, possible limits on the local interstellar electron spectrum have been determined. Synchrotron emission from these interstellar electrons is then compared with the local (disk) volume emissivity of nonthermal radio emission as deduced from a study of radio intensity profiles along the galactic equator. The detailed spectrum and magnitude of radio emissivity can be reproduced from the electron spectrum only for very stringent, conditions on the magnitude of the local interstellar magnetic field, and the amount of solar modulation of cosmic rays. Specifically it is found that B -L "'" 7 !-,G, and the residual modulation parameter KR "'" 0�75 GV. If solar modulation effects on the cosmic ray electron component are negligible then an implausibly high local field of "'" 20 !-,G is required.

Detection of Nonthermal Radio Emission from Coronal X-Ray Jets

1995 ◽  
Vol 447 (2) ◽  
Author(s):  
M. R. Kundu, ◽  
J. P. Raulin, ◽  
N. Nitta, ◽  
H. S. Hudson, ◽  
M. Shimojo, ◽  
...  
Keyword(s):  
Radio Emission ◽  
X Ray ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission

scholarly journals Magnetic annihilation in colliding-wind binary systems

1995 ◽  
Vol 163 ◽  
pp. 523-524
Author(s):  
M. Jardine ◽  
H.R. Allen ◽  
A.M.T. Pollock
Keyword(s):  
Particle Acceleration ◽  
Radio Emission ◽  
Magnetic Reconnection ◽  
Stagnation Point ◽  
Binary Systems ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission ◽  
Reconnection Model

We investigate the possibility that a stagnation-point magnetic reconnection model may account for the particle acceleration necessary for the generation of nonthermal radio emission in the Wolf-Rayet binary systems exemplified by WR140.

scholarly journals Voyager Detection of Nonthermal Radio Emission from Saturn

Science ◽  
1980 ◽  
Vol 209 (4462) ◽  
pp. 1238-1240 ◽  
Author(s):  
M. L. KAISER ◽  
M. D. DESCH ◽  
J. W. WARWICK ◽  
J. B. PEARCE
Keyword(s):  
Radio Emission ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission

scholarly journals Galactic Turbulence and the Origins of Cosmic Rays and the Galactic Magnetic Field

1957 ◽  
Vol 10 (4) ◽  
pp. 515 ◽  
Author(s):  
JH Piddington
Keyword(s):  
Magnetic Field ◽  
Cosmic Rays ◽  
Galactic Magnetic Field ◽  
Neutral Atoms ◽  
Interstellar Gas ◽  
Absorption Mechanism ◽  
Different Types

A new absorption mechanism is discussed in relation to the turbulence of the interstellar gas in the presence of a magnetic field. It is evaluated and compared with ordinary viscous absorption in different types of interstellar gas. Wherever there is a proportion, even though very small, of neutral atoms (helium being most likely) the new mechanism predominates for waves of length comparable with one parsec or more.

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