Development of magnetohydrodynamic turbulence in coronal loops
| Autor: | Constantino Ferro Fontan, Daniel O. Gómez |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Physics
Magnetic energy Turbulence Astronomy and Astrophysics Coronal loop Mechanics Dissipation Magnetohydrodynamic turbulence Kinetic energy Physics::Fluid Dynamics Classical mechanics Space and Planetary Science Energy cascade Physics::Space Physics Astrophysics::Solar and Stellar Astrophysics Magnetohydrodynamic drive |
| Zdroj: | The Astrophysical Journal. 394:662 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/171620 |
| Popis: | It is proposed that a stationary spectrum of magnetohydrodynamic turbulence is generated in solar coronal loops by the interweaving of magnetic field lines driven by the turbulent velocity field in the convective region. Starting from the set of incompressible magnetohydrodynamic equations, two ordinary differential equations describing the stationary turbulent energy spectrum and the frequency of direct energy cascade for a given kinetic energy spectrum of the subphotospheric convective motions are derived. An estimate of the typical dissipation length scale, at which magnetic energy efficiently heats the plasma by Joule dissipation is obtained. The impact of recent results of two-dimensional magnetohydrodynamic numerical simulations on the coronal heating problem is also discussed. |
| Databáze: | OpenAIRE |
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