The spatial distribution of hot and cool coronal loops and asymmetiric Stokes profiles
Shin'ichi NAGATA
Asymmetric Stokes V profiles emerge from the dynamical interaction
between flux tubes and surrounding medium at the photosphere. Such
interaction can excite Alfven waves or can form current sheets in the
flux tubes; these are considered to be promising mechanisms for
coronal heating. In this study, we investigate the spatial
distribution of the Stokes V asymmetries and the coronal temperature
with the Advanced Stokes Polarimeter(ASP) and the Transition Region
and Coronal Explorer (TRACE). We find that the larger asymmetries and
zero crossing velocity occur at the footpoints of hot loops (T>2NK) as
compared with those of cool loop footpoints (T=1~2MK). We discuss the
coronal heating model based on the relation between the observed
asymmetries and the coronal temperature distribution.
Correspondence
Shin'ichi NAGATA (nagata@kwasan.kyoto-u.ac.jp), Hida Observatory, Kyoto Univeristy
presentation
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