非表示:
キーワード:
-
MPIS_GROUPS:
Sun and Heliosphere
要旨:
IRIS high-resolution observations provide a unique opportunity to study the dynamics and evolution of the cool transition-region (TR) loops, which are poorly understood.
An active-region is observed by IRIS on 2017 March 25, which consists of low-lying cool loop
system. IRIS spectroscopic observations cover the broad range of temperature from the solar
photosphere to the lower solar corona. We conduct this study to understand the dynam-
ics/evolution of these loops in the various layers of the solar atmosphere. Footpoints of these loop threads are either dominated by very high blue-shifts or red-shifts. These loop threads also have the chromospheric counterparts as they are visible in middle of the solar chromosphere.
Radiances, Doppler-shifts and line widths are also investigated from photosphere to the lower solar coronal temperatures in this loop system. Si IV line profile is very complex and broad at the footpoints of these loops, which suggest the occurrence of transient events. We observe the variation of Doppler flows with height in the area of loop footpoints, which may be the result of siphon flows or transient events.
