Flux tubes as the origin of Net Circular Polarization in Sunspot Penumbrae

Abstract

We employ a 3-dimensional magnetohydrostatic model of a horizontal flux tube, embedded in a magnetic surrounding atmosphere, to successfully reproduce the azimuthal and center-to-limb variations of the Net Circular Polarization observed in sunspot penumbrae. This success is partly due to the realistic modeling of the interaction between the flux tube and the surrounding magnetic field.

Accepted for publication in ApJ Letters; 4 pages, 3 figures. Uses emulated ApJ

References in corpus (3)

• Magnetostatic penumbra models with field-free gaps
• The structure of sunspot penumbrae IV. MHS equilibrium for penumbral flux tubes and the origin of dark core penumbral filaments and penumbral grains
• The multi-component field topology of sunspot penumbrae - A diagnostic tool for spectropolarimetric measurements

Cited by in corpus (7)

• CRISP Spectropolarimetric Imaging of Penumbral Fine Structure
• Convection and the origin of Evershed flows in sunspot penumbrae
• Evidence of magnetic field wrapping around penumbral filaments
• Heat transfer in sunspot penumbrae. Origin of dark-cored penumbral filaments
• Sunspots: from small-scale inhomogeneities towards a global theory
• The Fine-Structure of the Net-Circular Polarization in a Sunspot Penumbra
• Models and Observations of Sunspot Penumbrae