Transport of magnetic flux from the canopy to the internetwork

Abstract

Recent observations have revealed that 8% of linear polarization patches in the internetwork quiet Sun are fully embedded in downflows. These are not easily explained with the typical scenarios for the source of internetwork fields which rely on flux emergence from below. We explore using radiative MHD simulations a scenario where magnetic flux is transported from the magnetic canopy overlying the internetwork into the photosphere by means of downward plumes associated with convective overshoot. We find that if a canopy-like magnetic field is present in the simulation, the transport of flux from the canopy is an important process for seeding the photospheric layers of the internetwork with magnetic field. We propose that this mechanism is relevant for the Sun as well, and it could naturally explain the observed internetwork linear polarization patches entirely embedded in downflows.

Accepted to ApJ

References in corpus (16)

• The Solar Optical Telescope for the Hinode Mission: An Overview
• A Substantial Amount of Hidden Magnetic Energy in the Quiet Sun
• Sunrise: instrument, mission, data and first results
• A solar surface dynamo
• The Imaging Magnetograph eXperiment (IMaX) for the Sunrise balloon-borne solar observatory
• The Sunrise Mission
• Emergence of Small-Scale Magnetic Loops in the Quiet Sun Internetwork
• Emergence of small-scale magnetic loops through the quiet solar atmosphere
• Strong horizontal photospheric magnetic field in a surface dynamo simulation
• The Filter Imager SuFI and the Image Stabilization and Light Distribution System ISLiD of the Sunrise Balloon-Borne Observatory: Instrument Description
• Coupling from the photosphere to the chromosphere and the corona
• Transverse component of the magnetic field in the solar photosphere observed by Sunrise
• The Wave-Front Correction System for the Sunrise Balloon-Borne Solar Observatory
• Turbulent small-scale dynamo action in solar surface simulations
• Low-lying magnetic loops in the solar internetwork
• Expansion of magnetic flux concentrations: a comparison of Hinode SOT d ata and models

Cited by in corpus (9)

• The Magnetic Field in the Solar Atmosphere
• Quiet Sun magnetic fields observed by Hinode: Support for a local dynamo
• The European Solar Telescope
• Solar magnetoconvection and small-scale dynamo: Recent developments in observation and simulation
• Dead calm areas in the very quiet Sun
• The solar internetwork. III. Unipolar versus bipolar flux appearance
• Global impact of emerging internetwork fields on the low solar atmosphere
• Magnetic properties of orphan penumbrae
• Three-dimensional non-LTE radiative transfer effects in Fe I lines IV. Line formation at high spatial resolution