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

Abstract

Aims: to investigate the evolution of plasma properties and Stokes parameters in photospheric magnetic bright points using 3D magneto-hydrodynamical simulations and radiative diagnostics of solar granulation. Methods: simulated time-dependent radiation parameters and plasma properties were investigated throughout the evolution of a bright point. Synthetic Stokes profiles for the FeI 630.25 nm line were calculated, which allowed the evolution of the Stokes-I line strength and Stokes-V area and amplitude asymmetries to also be investigated. Results: our results are consistent with theoretical predictions and published observations describing convective collapse, and confirm this as the bright point formation process. Through degradation of the simulated data to match the spatial resolution of SOT, we show that high spatial resolution is crucial for the detection of changing spectro-polarimetric signatures throughout a magnetic bright point's lifetime. We also show that the signature downflow associated with the convective collapse process is reduced towards zero as the radiation intensity in the bright point peaks, due to the magnetic forces present restricting the flow of material in the flux tube.

arXiv comment14 pages, 12 figures, accepted to A&A

References in corpus (23)

• The Solar Optical Telescope for the Hinode Mission: An Overview
• CRISP Spectropolarimetric Imaging of Penumbral Fine Structure
• Convectively driven vortex flows in the Sun
• Observational manifestations of solar magneto-convection -- center-to-limb variation
• Vorticity in the solar photosphere
• ROSA: a high cadence, synchronized multi-camera solar imaging system
• Alfvén waves in simulations of solar photospheric vortices
• Point spread functions for the Solar Optical Telescope onboard Hinode
• Propagating Wave Phenomena Detected in Observations and Simulations of the Lower Solar Atmosphere
• Statistical Distribution of Size and Lifetime of Bright Points Observed with the New Solar Telescope
• The Velocity Distribution of Solar Photospheric Magnetic Bright Points
• The Area Distribution of Solar Magnetic Bright Points
• Stokes diagnostics of simulated solar magneto-convection
• Mechanisms for MHD Poynting flux generation in simulations of solar photospheric magneto-convection
• Frequent Occurrence of High-speed Local Mass Downflows on the Solar Surface
• Statistics of convective collapse events in the photosphere and chromosphere observed with the Hinode SOT
• Magnetic field strength distribution of magnetic bright points inferred from filtergrams and spectro-polarimetric data
• Imaging Spectropolarimetry with IBIS: Evolution of Bright Points in the Quiet Sun
• Tracking Magnetic Bright Point Motions Through the Solar Atmosphere
• Shocks in the Quiet Solar Photosphere: A Rather Common Occurrence
• Transient downflows associated with the intensification of small-scale magnetic features and bright point formation
• A photospheric bright point model
• Evolution of solar magnetic tubes and its manifestation in Stokes parameters

Cited by in corpus (10)

• Critical Science Plan for the Daniel K. Inouye Solar Telescope (DKIST)
• Solar magnetoconvection and small-scale dynamo: Recent developments in observation and simulation
• The formation and disintegration of magnetic bright points observed by Sunrise/IMaX
• Ellerman Bombs with Jets: Cause and Effect
• Influence of NLTE effects in Fe I lines on inverted atmosphere II. 6301 A and 6302 A lines formed in 3DNLTE
• Ultra-high-resolution Observations of MHD Waves in Photospheric Magnetic Structures
• Long-term trends of magnetic bright points: I. Number of MBPs at disc centre
• Model of a fluxtube with a twisted magnetic field in the stratified solar atmosphere
• Open and closed magnetic configurations of twisted flux tubes
• High-resolution spectropolarimetric observations of the temporal evolution of magnetic fields in photospheric bright points