Plasma properties and Stokes profiles during the lifetime of a photospheric magnetic bright point

R. L. Hewitt, S. Shelyag, M. Mathioudakis, F. P. Keenan

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Aims: In this paper we aim to investigate the evolution of plasmaproperties and Stokes parameters in photospheric magnetic bright pointsusing 3D magneto-hydrodynamical simulations and radiative diagnostics ofsolar granulation.

Methods: Simulated time-dependent radiationparameters and plasma properties were investigated throughout theevolution of a bright point. Synthetic Stokes profiles for the FeI630.25 nm line were calculated, which also allowed the evolution of theStokes-I line strength and Stokes-V area and amplitude asymmetries to beinvestigated.

Results: Our results are consistent withtheoretical predictions and published observations describing convectivecollapse, and confirm this as the bright point formation process.Through degradation of the simulated data to match the spatialresolution of SOT, we show that high spatial resolution is crucial forthe detection of changing spectro-polarimetric signatures throughout amagnetic bright point's lifetime. We also show that the signaturedownflow associated with the convective collapse process tends towardszero as the radiation intensity in the bright point peaks, because ofthe magnetic forces present restricting the flow of material in the fluxtube.
Original languageEnglish
Article numberA84
Pages (from-to)1-13
JournalAstronomy & Astrophysics
Volume565
DOIs
Publication statusPublished - May 2014

Keywords

  • Sun: photosphere
  • Sun: magnetic fields

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