Why Does TRACE See So Many Isothermal Loops?

Details Why Does TRACE See So Many Isothermal Loops? Why Does TRACE See So Many Isothermal Loops?

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp13b..03w&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP13B-03

Other

7509 Corona, 7594 Instruments And Techniques

Scientific paper

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.

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