Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21631706k&link_type=abstract
American Astronomical Society, AAS Meeting #216, #317.06; Bulletin of the American Astronomical Society, Vol. 41, p.899
Astronomy and Astrophysics
Astronomy
Scientific paper
Recent high-resolution spectro-polarimetric observations of a sunspot detected formation of bipolar magnetic patches in the mid penumbra and propagation of these patches toward the outer penumbral boundary. The observations have been interpreted as an evidence of sea-serpent field lines near the solar surface. Using a radiative 3D MHD code, we model the behavior of solar magnetoconvection in strongly inclined magnetic field of penumbra. The numerical simulation results reproduce the moving bipolar magnetic elements observed in high-resolution SOHO/MDI and Hinode/SOT data and also their physical properties, supporting the sea-serpent model. The simulations explain the sea-serpent structure and dynamics of the penumbral field as a consequence of turbulent magnetoconvection in a highly inclined, strong magnetic field, which forms filamentary structures and has properties of traveling convective wave. The model also shows that the appearance of the sea-serpent magnetic field lines is closely related to high-speed patches ("Evershed clouds") of the penumbra radial outflow.
Bellot Rubio Luis Ramon
Kitiashvili Irina
Kosovichev Aleksandr G.
Mansour Nagi N.
Sainz Dalda Alberto
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