Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.46g&link_type=abstract
"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,
Physics
Scientific paper
We present multi-wavelength high-resolution observations of active region NOAA 10971, performed by the Solar Optical Telescope aboard the Hinode satellite. Small-scale events of flux emergence occurring in this region have been singled out. In particular, we report observations of chromospheric Ca II H brightenings associated with a repeated 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. We compare these observations with simultaneous spectropolarimetric measurements, using the SIR code to retrieve the thermal, dynamical, and magnetic properties of the emerging region. We discuss our results in the context of the chromospheric heating problem. Magnetic reconnection between the emerging flux and the pre-existing chromospheric field would be able to explain the observed chromospheric brightness enhancements. The reconnection releases energy, and this could be an efficient source of local heating for the chromosphere, as suggested by recent 3D numerical simulations.
Bellot Rubio Luis Ramon
Guglielmino Salvatore L.
Romano Pado
Zuccarello Francesca
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