Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 700, Issue 2, Pages L145-L148Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/700/2/L145
Keywords
Sun: magnetic fields; Sun: photosphere; techniques: polarimetric
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Funding
- MAE Spettro-Polarimetria Solare Bidimensionale research project
- Agenzia Spaziale Italiana [ASI-ESS]
- Istituto Nazionale di Astrofisica [PRIN-INAF 2007]
- Spanish MICINN [ESP2006-13030-C06-02]
- Junta de Andalucia [P07-TEP-2687]
- IBIS
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We present the results from first spectropolarimetric observations of the solar photosphere acquired at the Dunn Solar Telescope with the Interferometric Bidimensional Spectrometer. Full Stokes profiles were measured in the Fe I 630.15 nm and Fe I 630.25 nm lines with high spatial and spectral resolutions for 53 minutes, with a Stokes V noise of 3 x 10(-3) the continuum intensity level. The data set allows us to study the evolution of several magnetic features associated with G-band bright points (BPs) in the quiet Sun. Here we focus on the analysis of three distinct processes, namely the coalescence, fragmentation, and cancellation of G-band BPs. Our analysis is based on an SIR inversion of the Stokes I and V profiles of both Fe I lines. The high spatial resolution of the G-band images combined with the inversion results helps to interpret the undergoing physical processes. The appearance (dissolution) of high-contrast G-band BPs is found to be related to the local increase (decrease) of the magnetic filling factor, without appreciable changes in the field strength. The cancellation of opposite-polarity BPs can be the signature of either magnetic reconnection or the emergence/submergence of magnetic loops.
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