Test-particle acceleration in a hierarchical three-dimensional turbulence model
The acceleration of charged particles is relevant to the solar corona over a broad range of scales and energies. High-energy particles are usually detected in concomitance with large energy release events like solar eruptions and flares. Nevertheless, acceleration can occur at smaller scales, charac...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_0004637X_v783_n2_p_Dalena |
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todo:paper_0004637X_v783_n2_p_Dalena2023-10-03T14:02:34Z Test-particle acceleration in a hierarchical three-dimensional turbulence model Dalena, S. Rappazzo, A.F. Dmitruk, P. Greco, A. Matthaeus, W.H. acceleration of particles magnetic reconnection Sun: corona turbulence The acceleration of charged particles is relevant to the solar corona over a broad range of scales and energies. High-energy particles are usually detected in concomitance with large energy release events like solar eruptions and flares. Nevertheless, acceleration can occur at smaller scales, characterized by dynamical activity near current sheets. To gain insight into the complex scenario of coronal charged particle acceleration, we investigate the properties of acceleration with a test-particle approach using three-dimensional magnetohydrodynamic (MHD) models. These are obtained from direct solutions of the reduced MHD equations, well suited for a plasma embedded in a strong axial magnetic field, relevant to the inner heliosphere. A multi-box, multiscale technique is used to solve the equations of motion for protons. This method allows us to resolve an extended range of scales present in the system, namely, from the ion inertial scale of the order of a meter up to macroscopic scales of the order of 10 km (1/100th of the outer scale of the system). This new technique is useful to identify the mechanisms that, acting at different scales, are responsible for acceleration to high energies of a small fraction of the particles in the coronal plasma. We report results that describe acceleration at different stages over a broad range of time, length, and energy scales. © 2014. The American Astronomical Society. All rights reserved. Fil:Dmitruk, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004637X_v783_n2_p_Dalena |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
acceleration of particles magnetic reconnection Sun: corona turbulence |
| spellingShingle |
acceleration of particles magnetic reconnection Sun: corona turbulence Dalena, S. Rappazzo, A.F. Dmitruk, P. Greco, A. Matthaeus, W.H. Test-particle acceleration in a hierarchical three-dimensional turbulence model |
| topic_facet |
acceleration of particles magnetic reconnection Sun: corona turbulence |
| description |
The acceleration of charged particles is relevant to the solar corona over a broad range of scales and energies. High-energy particles are usually detected in concomitance with large energy release events like solar eruptions and flares. Nevertheless, acceleration can occur at smaller scales, characterized by dynamical activity near current sheets. To gain insight into the complex scenario of coronal charged particle acceleration, we investigate the properties of acceleration with a test-particle approach using three-dimensional magnetohydrodynamic (MHD) models. These are obtained from direct solutions of the reduced MHD equations, well suited for a plasma embedded in a strong axial magnetic field, relevant to the inner heliosphere. A multi-box, multiscale technique is used to solve the equations of motion for protons. This method allows us to resolve an extended range of scales present in the system, namely, from the ion inertial scale of the order of a meter up to macroscopic scales of the order of 10 km (1/100th of the outer scale of the system). This new technique is useful to identify the mechanisms that, acting at different scales, are responsible for acceleration to high energies of a small fraction of the particles in the coronal plasma. We report results that describe acceleration at different stages over a broad range of time, length, and energy scales. © 2014. The American Astronomical Society. All rights reserved. |
| format |
JOUR |
| author |
Dalena, S. Rappazzo, A.F. Dmitruk, P. Greco, A. Matthaeus, W.H. |
| author_facet |
Dalena, S. Rappazzo, A.F. Dmitruk, P. Greco, A. Matthaeus, W.H. |
| author_sort |
Dalena, S. |
| title |
Test-particle acceleration in a hierarchical three-dimensional turbulence model |
| title_short |
Test-particle acceleration in a hierarchical three-dimensional turbulence model |
| title_full |
Test-particle acceleration in a hierarchical three-dimensional turbulence model |
| title_fullStr |
Test-particle acceleration in a hierarchical three-dimensional turbulence model |
| title_full_unstemmed |
Test-particle acceleration in a hierarchical three-dimensional turbulence model |
| title_sort |
test-particle acceleration in a hierarchical three-dimensional turbulence model |
| url |
http://hdl.handle.net/20.500.12110/paper_0004637X_v783_n2_p_Dalena |
| work_keys_str_mv |
AT dalenas testparticleaccelerationinahierarchicalthreedimensionalturbulencemodel AT rappazzoaf testparticleaccelerationinahierarchicalthreedimensionalturbulencemodel AT dmitrukp testparticleaccelerationinahierarchicalthreedimensionalturbulencemodel AT grecoa testparticleaccelerationinahierarchicalthreedimensionalturbulencemodel AT matthaeuswh testparticleaccelerationinahierarchicalthreedimensionalturbulencemodel |
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1807320107578294272 |