Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.25j&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
The dependence of penumbral microjets inclination on the position within penumbra is investigated using the Ca II images taken with Hinode SOT. The penumbral microjet inclination is increasing towards the outer edge of the penumbra; from 35 deg at the umbra-penumbra boundary up to 70 deg at the penumbra/quiet sun boundary. The comparison with the inclination of photospheric magnetic field suggest that the penumbral microjet follows the opening magnetic field lines of a vertical flux tube that creates the sunspot. Another data set of Ca II images with simultaneous SP measurements is used to study the possible relation between the penumbral microjets and the downflows observed in middle of the centre-side penumbra. Some of these downflow patches can be associated with the Ca II brightenings and might correspond to the reconnection outflow. As is retrieved from the Stokes inversion, the downflow preferentially take place in the lower photosphere and this may provide a constraint on a reconnection site.
Jurcak Jan
Katsukawa Yukio
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