Computing EUV and Soft X-rays Emissions from an Active Region in 3D
Abstract
EUV and soft X-rays can be a useful tool for plasma diagnostics when applied to an active region. Instead of trying to unfold the plasma properties from the observed emissions, we use a forward modeling method on AR 7986. Namely, we first compute the thermal structure of the active region. The resulting density and temperature profiles are then used to compute the expected emissions, and the synthetic images are compared with observations. Our model reproduces many features of an observed active region, including a dark neutral line, coronal loops, fan loops, etc. The time evolution of the emissions show plasma flows that resemble coronal rains. Quantitatively, the coronal part of the loops compare favorably with observations on all three coronal lines of EIT, although their footpoints are somewhat brighter than observed. The discrepancy may be attributed to the inaccurate abundances used to compared the emissions in the low corona and below.Work supported by the Heliophysics Theory Program of NASA.
- Publication:
-
American Astronomical Society Meeting Abstracts #224
- Pub Date:
- June 2014
- Bibcode:
- 2014AAS...22432340M