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Record Details

Record 2 of 1567
Cosmic-ray acceleration during the impact of shocks on dense clouds
External Online Source: doi:10.1086/172158
Author and Affiliation:
Jones, T. W.(Minnesota Univ., Minneapolis, United States)
Kang, Hyesung(Minnesota Univ., Minneapolis)
Abstract: In order to elucidate the properties of diffusive shock acceleration in nonuniform environments, an extensive set of simulations of the dynamical interactions between plane nonradiative shocks and dense gas clouds was carried out initially in static equilibrium with their environments. These time-dependent calculations are based on the two-fluid model for diffusive cosmic ray transport, and include the dynamically active energetic proton component of the cosmic rays as well as passive electron and magnetic field components. Except when the incident shock is itself already dominated by cosmic ray pressure, it is found that the presence of the cloud adds little to the net acceleration efficiency of the original shock and can, in fact, reduce slightly the net amount of energy transferred to cosmic rays after a given time. It is found that, in 2D cloud simulations, the always-weak bow shock and the shock inside the cloud are less important to acceleration during the interaction than the tail shock.
Publication Date: Jan 10, 1993
Document ID:
19930037598
(Acquired Dec 28, 1995)
Accession Number: 93A21595
Subject Category: SPACE RADIATION
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 1 (ISSN 0004-637X); 402; 2; p. 560-573.
Publisher Information: United States
Contract/Grant/Task Num: NSF AST-87-20285; NSF AST-91-00486; NAGW-2548
Financial Sponsor: NASA; United States
Organization Source: NASA; Washington, DC, United States
Description: 17p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: COSMIC RAYS; DENSE PLASMAS; MOLECULAR CLOUDS; PARTICLE ACCELERATION; SHOCK WAVES; BOW WAVES; EMISSIVITY; ENERGETIC PARTICLES; HYDRODYNAMIC EQUATIONS; TWO DIMENSIONAL MODELS; TWO FLUID MODELS
Imprint And Other Notes: Astrophysical Journal, Part 1 vol. 402, no. 2 p. 560-573. Jan. 10, 1993
Miscellaneous Notes: Research supported by Univ. of Minnesota
Availability Source: Other Sources
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