Why Does TRACE See So Many Isothermal Loops?
Abstract
The Transition Region and Coronal Explorer (TRACE) has advanced our view of the dynamics of solar active regions. TRACE brings the highest spatial resolution and reasonable temporal coverage to bear on the evolution and structure of coronal plasma; temperature discrimination is achieved with three narrowband EUV filters and the filter ratio method. Many thin coronal loops have been observed to have near-constant filter ratios along their length, which has commonly been interpreted as evidence for isothermal structure. We discuss and quantify how the TRACE filter response ratios are biased to estimate relatively constant isothermal temperatures in the observed range when the plasma along the line-of-sight is multithermal.
- Publication:
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AGU Spring Meeting Abstracts
- Pub Date:
- May 2005
- Bibcode:
- 2005AGUSMSP13B..03W
- Keywords:
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- 7509 Corona;
- 7594 Instruments and techniques