Analysis of Two Coronal Loops with Combined TRACE and SOHO/CDS Data |
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| Authors: | J T Scott P C H Martens J W Cirtain |
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| Institution: | (1) Department of Physics, Montana State University, Bozeman, MT 59717, USA;(2) Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA;(3) Solar Physics Group, VP62 National Space Science and Technology Center NASA/Marshall Space Flight Center, 320 Sparkman Drive, Huntsville, AL 35805, USA |
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| Abstract: | We use an innovative research technique to analyze combined images from the Coronal Diagnostic Spectrometer (CDS) on the Solar and Heliospheric Observatory (SOHO) and the Transition Region and Coronal Explorer (TRACE). We produce a high spatial and temporal resolution simulated CDS raster or “composite” map from TRACE data and use
this composite map to jointly analyze data from both instruments. We show some of the advantages of using the “composite”
map method for coronal loop studies. We investigate two postflare loop structures. We find cool material (250 000 K) concentrated
at the tips or apex of the loops. This material is found to be above its scale height and therefore not in hydrostatic equilibrium.
The exposure times of the composite map and TRACE images are used to give an estimate of another loop’s cooling time. The
contribution to the emission in the TRACE images for the spectral lines present in its narrow passband is estimated by using
the CDS spectral data and CHIANTI to derive synthetic spectra. We obtain cospatial and cotemporal data collected by both instruments
in SOHO Joint Observations Program (JOP) 146 and show how the combination of these data can be utilized to obtain more accurate
measurements of coronal plasmas than if analyzed individually.
Electronic Supplementary Material The online version of this article () contains supplementary material, which is available to authorized users. |
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| Keywords: | Sun: corona Sun: EUV Sun: coronal loops Sun: spectra |
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