IMAGING SPECTROPOLARIMETRY WITH IBIS: EVOLUTION OF BRIGHT POINTS IN THE QUIET SUN

被引:36
|
作者
Viticchie, B. [1 ]
Del Moro, D. [1 ]
Berrilli, F. [1 ]
Bellot Rubio, L. [2 ]
Tritschler, A. [3 ]
机构
[1] Univ Roma Tor Vergata, Dipartimento Fis, I-00133 Rome, Italy
[2] CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain
[3] Natl Solar Observ, Sunspot, NM 88349 USA
关键词
Sun: magnetic fields; Sun: photosphere; techniques: polarimetric; MAGNETIC-FIELDS; INTERNETWORK; PROFILES; FLUX;
D O I
10.1088/0004-637X/700/2/L145
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
引用
收藏
页码:L145 / L148
页数:4
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