HINODE OBSERVATIONS OF CHROMOSPHERIC BRIGHTENINGS IN THE CA II H LINE DURING SMALL-SCALE FLUX EMERGENCE EVENTS

被引：30
|
作者：
Guglielmino, S. L. [1 ]
Zuccarello, F. [1 ]
Romano, P. [2 ]
Rubio, L. R. Bellot [3 ]
机构：
[1] Univ Catania, Dipartimento Fis & Astron, I-95123 Catania, Italy
[2] INAF Osservatorio Astrofis Catania, I-95123 Catania, Italy
[3] CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2008年 / 688卷 / 02期
基金：
英国科学技术设施理事会;
关键词：
Sun: activity; Sun: chromosphere; Sun: magnetic fields; Sun: photosphere;
D O I：
10.1086/595657
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Ca II H emission is a well-known indicator of magnetic activity in the Sun and other stars. It is also viewed as an important signature of chromospheric heating. However, the Ca II H line has not been used as a diagnostic of magnetic flux emergence from the solar interior. Here we report on Hinode observations of chromospheric Ca II H brightenings associated with a repeated, small-scale flux emergence event. We describe this process and investigate the evolution of the magnetic flux, G-band brightness, and Ca II H intensity in the emerging region. Our results suggest that energy is released in the chromosphere as a consequence of interactions between the emerging flux and the preexisting magnetic field, in agreement with recent 3D numerical simulations.
引用
收藏
页码：L111 / L114
页数：4
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