Coronal heating by the resonant absorption of Alfven waves: Wavenumber scaling laws.

Details Coronal heating by the resonant absorption of Alfven waves: Wavenumber scaling laws. Coronal heating by the resonant absorption of Alfven waves: Wavenumber scaling laws.

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...444..471o&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 444, no. 1, p. 471-477

Physics

60

Coronal Loops, Heating, Magnetohydrodynamic Waves, Magnetohydrodynamics, Modes, Scaling Laws, Solar Physics, Cavity Resonators, Perturbation, Plasmas (Physics), Simulation, Solar Magnetic Field, Sun

Scientific paper

The importance of global modes in coronal loop heating is well established. In the present work the scaling of the global-mode resonant heating rate with the perturbation wavenumbers is studied with the numerical solution of the linearized time-dependent MHD equations for a full compressible, low-beta, resistive plasma using an implicit integration scheme. The numerical simulations demonstrate that the dissipation on inhomogeneities in the background Alfven speed occurs in narrow resonant layer with the highest heating rate at the global-mode frequency. The global-mode heating rate H r was found to scale as H (Sub r) approximately k y 1.03 when k z = 0.1, and as H r approximately k y -1.93 when k z = 0.75, where k y and k z are the wavenumbers in the perpendicular and parallel to the magnetic field directions, respectively, while the dependence of H r on k z is more complex. The quality factor Q of the MHD resonance cavity scales as Q approximately k y -1.8 for k z = 0.75 and as Q approximately k y -1.46 for k z = 0.1. The numerically determined heating rate scaling, the global-mode fequency, and the quality factor are in good agreement with the analytical linear theory. The magnitude of the perturbed velocities was found to decrease with k y. Assuming typical coronal loop parameters (B 0 = 100-200 G, upsilon A = 2000-4000 km/s), the Alfven waves can supply the required heating to a low-Q loops.

Affiliated with

Also associated with

No associations

Rating

Coronal heating by the resonant absorption of Alfven waves: Wavenumber scaling laws. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Coronal heating by the resonant absorption of Alfven waves: Wavenumber scaling laws., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coronal heating by the resonant absorption of Alfven waves: Wavenumber scaling laws. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1058522