Multi-line Spectroscopic Analyses of the Dynamical Cool Loops Using Interface 
Region Imaging Spectrometer (IRIS) Observations

Rao, Yamini K.; Kayshap, P.; Srivastava, A. K.; Wilhelm, Klaus; Dwivedi, B. N.

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Multi-line Spectroscopic Analyses of the Dynamical Cool Loops Using Interface Region Imaging Spectrometer (IRIS) Observations

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Wilhelm, Klaus
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

Rao, Y. K., Kayshap, P., Srivastava, A. K., Wilhelm, K., & Dwivedi, B. N. (2018). Multi-line Spectroscopic Analyses of the Dynamical Cool Loops Using Interface Region Imaging Spectrometer (IRIS) Observations. Poster presented at IAU Symposia 340: Long-term datasets for the understanding of solar and stellar magnetic cycles, Jaipur, India.

Cite as: https://hdl.handle.net/21.11116/0000-0000-8E22-A

Abstract

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.