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Paper: Polarimetric Observations of the Formation of a G-Band Bright Point
Volume: 358, Solar Polarization 4
Page: 72
Authors: Beck, C.; Schmidt, W.; Bellot Rubio, L.R.; Schlichenmaier, R.; Suetterlin, P.; Lites, B.W.
Abstract: We investigate the kinematic and magnetic properties of G-band bright points in the moat of a regular sunspot. The analysis is based on vector polarimetric measurements made at the German Vacuum Tower Telescope in visible (630 nm) and infrared (1565 nm) spectral lines, complemented by high-resolution filtergrams in the G-band at 430.6nm and the core of the Ca II H line at 396.7nm from the Dutch Open Telescope. The spectro-polarimetric data has been inverted to derive the magnetic field properties of the observed region. We witness the formation of a G-band bright point from a patch of diffuse flux with an initial field strength of 0.4 kG. The magnetic field strength increases to 0.9 kG in the course of several minutes, accompanied by a downflow of magnetized plasma. A few minutes after the field intensification, a G-band bright point is seen at the location of the flux concentration. The formation of the bright point shows the signatures of convective collapse.
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