Zobrazeno 1 - 10
of 365
pro vyhledávání: '"Einaudi G"'
Parker (1972) first proposed that coronal heating was the necessary outcome of an energy flux caused by the tangling of coronal magnetic field lines by photospheric flows. In this paper we discuss how this model has been modified by subsequent numeri
Externí odkaz:
http://arxiv.org/abs/2103.13499
Publikováno v:
ApJ 883, 148 (2019)
We investigate the dynamics of a closed corona cartesian reduced magnetohydrodynamic (MHD) model where photospheric vortices twist the coronal magnetic field lines. We consider two corotating or counter-rotating vortices localized at the center of th
Externí odkaz:
http://arxiv.org/abs/1905.04420
Publikováno v:
MNRAS 478, 2257 (2018)
The heating of coronal loops is investigated to understand the observational consequences in terms of the thermodynamics and radiative losses from the Sun as well as the magnetized coronae of stars with an outer convective envelope. The dynamics of t
Externí odkaz:
http://arxiv.org/abs/1805.00480
Autor:
Dahlburg, R. B., Einaudi, G., Taylor, B. D., Ugarte-Urra, I., Warren, H. P., Rappazzo, A. F., Velli, M.
Publikováno v:
ApJ 817, 47 (2016)
The evolution of a coronal loop is studied by means of numerical simulations of the fully compressible three-dimensional magnetohydrodynamic equations using the HYPERION code. The footpoints of the loop magnetic field are advected by random motions.
Externí odkaz:
http://arxiv.org/abs/1512.03079
Publikováno v:
ApJ, 771, 76 (2013)
We present simulations modeling closed regions of the solar corona threaded by a strong magnetic field where localized photospheric vortical motions twist the coronal field lines. The linear and nonlinear dynamics are investigated in the reduced magn
Externí odkaz:
http://arxiv.org/abs/1301.7678
Context. Photospheric motions shuffle the footpoints of the strong axial magnetic field that threads coronal loops giving rise to turbulent nonlinear dynamics characterized by the continuous formation and dissipation of field-aligned current sheets w
Externí odkaz:
http://arxiv.org/abs/1208.2459
Publikováno v:
ApJ, 722, 65 (2010)
We present a series of numerical simulations aimed at understanding the nature and origin of turbulence in coronal loops in the framework of the Parker model for coronal heating. A coronal loop is studied via reduced magnetohydrodynamics simulations
Externí odkaz:
http://arxiv.org/abs/1003.3872
Publikováno v:
ApJ, 633:474-488, 2005 November 1
The plasma density enhancements recently observed by the Large-Angle Spectrometric Coronagraph (LASCO) instrument onboard the Solar and Heliospheric Observatory (SOHO) spacecraft have sparked considerable interest. In our previous theoretical study o
Externí odkaz:
http://arxiv.org/abs/1002.3325
Publikováno v:
Proceedings of the NSO Workshop #24 -- Subsurface and Atmospheric Influences on Solar Activity, Eds. R. Howe & R. Komm, ASP Conference Series, 383, 353 (2008)
The Parker or field line tangling model of coronal heating is investigated through long-time high-resolution simulations of the dynamics of a coronal loop in cartesian geometry within the framework of reduced magnetohydrodynamics (RMHD). Slow photosp
Externí odkaz:
http://arxiv.org/abs/1002.2631
Publikováno v:
TURBULENCE AND NONLINEAR PROCESSES IN ASTROPHYSICAL PLASMAS; 6th Annual International Astrophysics Conference. AIP Conference Proceedings, Volume 932, pp. 342-349 (2007)
To understand the nonlinear dynamics of the Parker scenario for coronal heating, long-time high-resolution simulations of the dynamics of a coronal loop in cartesian geometry are carried out. A loop is modeled as a box extended along the direction of
Externí odkaz:
http://arxiv.org/abs/1002.2635