1201.6501 (B. Viticchie)
B. Viticchie
The abundance of Stokes V profiles dominated by one lobe at the locations of
emergence of Omega-shaped magnetic loops is evaluated. The emergence events
were found in Hinode SOT/SP time-sequences of quiet-Sun regions. Such a study
has the aim of confirming a prediction based on the basic geometrical and
physical properties of emerging magnetic loops: Stokes V profiles dominated by
one lobe are possibly the main polarimetric signature of these structures. In
agreement with this prediction, 47 % of the Stokes V profiles analyzed has an
unsigned amplitude asymmetry larger than 0.3, while in the quiet-Sun the
abundance is of about 30 %. This excess with respect to the quiet-Sun is found
consistently for whatever value of the threshold on the amplitude asymmetry.
Such a result proves the goodness of the physical scenarios so far proposed for
the interpretation of loop emergence events and may prompt the use of Stokes V
profiles dominated by one lobe as a new proxy for their identification in
observations with a good spectral sampling.
View original:
http://arxiv.org/abs/1201.6501
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