Centre-to-limb spectro-polarimetric diagnostics of simulated solar photospheric magneto-convection: signatures of photospheric Alfven waves

Abstract

Using numerical simulations of the magnetised solar photosphere carried out with the radiative magneto-hydrodynamic code, MURaM, and detailed spectro-polarimetric diagnostics of the simulated photospheric 6302A FeI line, spectro-polarimetric signatures of Alfven waves in magnetised intergranular lanes of the simulated solar photosphere were analysed at different positions at the solar disk. The torsional Alfven waves in the intergranular lanes are horizontal plasma motions, which do not have a thermal perturbation counterpart. We find signatures of Alfven waves as small-scale line profile Doppler shifts and Stokes-V area asymmetry enhancements in the simulated off-disk centre observations. These photospheric features disappear when the simulated observations are degraded with a telescope PSF similar to the one of Hinode. We analyse the possibilities for direct observations and confirmation of Alfven wave presence in the solar photosphere.

6 pages, 3 figures, accepted to PASJ

References in corpus (4)

• The Solar Optical Telescope for the Hinode Mission: An Overview
• Alfven Waves in the Lower Solar Atmosphere
• Convectively driven vortex flows in the Sun
• Stokes diagnostics of simulated solar magneto-convection

Cited by in corpus (6)

• The Dynamics of Rapid Redshifted and Blueshifted Excursions in the Solar Halpha line
• An Inside Look at Sunspot Oscillations with Higher Azimuthal Wavenumbers
• Stellar Surface Magneto-Convection as a Source of Astrophysical Noise III. Sun-as-a-star Simulations and Optimal Noise Diagnostics
• On the effects of ion-neutral interactions in solar plasmas
• Chromospheric Heating by MHD Waves and Instabilities
• Spectro-polarimetric simulations of the solar limb: absorption-emission FeI $6301.5\mathring{\mathrm{A}}$ and $6302.5\mathring{\mathrm{A}}$ line profiles and torsional flows in the intergranular magnetic flux concentrations