Dynamical Properties Of An Active Region Loop System Observed On The Solar Disc With SUMER/SOHO

Details Dynamical Properties Of An Active Region Loop System Observed On The Solar Disc With SUMER/SOHO Dynamical Properties Of An Active Region Loop System Observed On The Solar Disc With SUMER/SOHO

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..429l&link_type=abstract

8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

In this paper we present and discuss spectra obtained by SUMER from an active region loop system observed on the solar disc, close to the central meridian. This region has been observed with a spatial resolution of about 2'' by 2'' in emission lines formed in the transition region and inner corona. Our aim is to investigate the physical structure and dynamical behaviour of the plasma in the transition region portion of the magnetic loops. To this purpose, we have reduced and analysed the spectral observations in order to determine the values of intensity, Doppler shift and line profile width for the selected emission lines in all the spatially resolved elements of the examined area of the solar disc. These data have been used to locate the coronal structures within the observed active region and to identify their morphology. They have also been used to include a study of the spatial relationship between loops as seen in spectral lines formed at different temperatures. As far as the data relating to the line profiles are concerned, they have been analysed with the purpose of examining indications of the presence of resolved mass motions inside the active region and also for investigating the non-thermal broadening of the lines, which is usually attributed to microturbulence and probably related to the heating mechanisms working in these layers of the solar atmosphere. We have also explored the possibility of correlations amongst the line intensities, Doppler shifts and microturbulence velocities, which might help us to gain insight into the physical processes occurring in active regions, particularly in the transition region portion of magnetic loops.

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