Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-14
Astronomy and Astrophysics
Astrophysics
12 Pages, 6 Figures, Accepted for publication in ApJ Letters
Scientific paper
10.1086/595657
\ion{Ca}{2} 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 \ion{Ca}{2} 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 \ion{Ca}{2} 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 \ion{Ca}{2} 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 pre-existing magnetic field, in agreement with recent 3D numerical simulations.
Bellot Rubio Luis Ramon
Guglielmino Salvatore L.
Romano Pado
Zuccarello Francesca
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