Magnetohydrodynamic turbulence dissipation and stochastic proton acceleration in solar flares
The Alfven and fast magnetosonic wave MHD modes can stochastically accelerate protons from super-Alfvenic to ultrarelativistic energies in solar flares. It is the Landau resonance, however, which generates most of the magnetosonic wave energy being dissipated on electron heating rather than on stoch...
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| Published in | The Astrophysical journal Vol. 376; no. 1; pp. 342 - 354 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Legacy CDMS
University of Chicago Press
20.07.1991
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0004-637X 1538-4357 |
| DOI | 10.1086/170284 |
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| Abstract | The Alfven and fast magnetosonic wave MHD modes can stochastically accelerate protons from super-Alfvenic to ultrarelativistic energies in solar flares. It is the Landau resonance, however, which generates most of the magnetosonic wave energy being dissipated on electron heating rather than on stochastic proton acceleration. Alfven waves are also subject to a nonlinear wave-particle interaction, and nonlinear Landau damping can selectively and efficiently heat the ambient protons to preaccelerate many to super-Alfvenic speeds. A spectrum of Alfven waves can therefore energize protons from low-temperature thermal to ultrarelativistic energies through a combination of linear and nonlinear particle-wave interactions. |
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| AbstractList | The Alfven and fast magnetosonic wave MHD modes can stochastically accelerate protons from super-Alfvenic to ultrarelativistic energies in solar flares. It is the Landau resonance, however, which generates most of the magnetosonic wave energy being dissipated on electron heating rather than on stochastic proton acceleration. Alfven waves are also subject to a nonlinear wave-particle interaction, and nonlinear Landau damping can selectively and efficiently heat the ambient protons to preaccelerate many to super-Alfvenic speeds. A spectrum of Alfven waves can therefore energize protons from low-temperature thermal to ultrarelativistic energies through a combination of linear and nonlinear particle-wave interactions. 60 refs. The Alfven and fast magnetosonic wave MHD modes can stochastically accelerate protons from super-Alfvenic to ultrarelativistic energies in solar flares. It is the Landau resonance, however, which generates most of the magnetosonic wave energy being dissipated on electron heating rather than on stochastic proton acceleration. Alfven waves are also subject to a nonlinear wave-particle interaction, and nonlinear Landau damping can selectively and efficiently heat the ambient protons to preaccelerate many to super-Alfvenic speeds. A spectrum of Alfven waves can therefore energize protons from low-temperature thermal to ultrarelativistic energies through a combination of linear and nonlinear particle-wave interactions. |
| Audience | PUBLIC |
| Author | Miller, James A. |
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| Keywords | Magnetohydrodynamics Fermi acceleration Cyclotron resonance Particle acceleration Wave damping Sun Solar flare MHD wave Ultrarelativistic particle Magnetoacoustic wave Landau damping Alfven wave Particle emission Proton Particle wave interaction |
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| Snippet | The Alfven and fast magnetosonic wave MHD modes can stochastically accelerate protons from super-Alfvenic to ultrarelativistic energies in solar flares. It is... |
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| SubjectTerms | 640104 - Astrophysics & Cosmology- Solar Phenomena ACCELERATION Astronomy BARYONS CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS DAMPING Earth, ocean, space ELEMENTARY PARTICLES Exact sciences and technology FERMIONS Flares, bursts, and related phenomena HADRONS HYDROMAGNETIC WAVES LANDAU DAMPING NUCLEONS PROTONS RADIATIONS SOLAR ACTIVITY SOLAR FLARES SOLAR PARTICLES Solar Physics SOLAR PROTONS SOLAR RADIATION Solar system STELLAR RADIATION STOCHASTIC PROCESSES TURBULENCE WAVE PROPAGATION |
| Title | Magnetohydrodynamic turbulence dissipation and stochastic proton acceleration in solar flares |
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