Temperature and Emission-Measure Profiles along Long-lived Solar Coronal Loops Observed with the Transition Region and Coronal Explorer
Abstract
We report an initial study of temperature and emission-measure distributions along four steady loops observed with the Transition Region and Coronal Explorer at the limb of the Sun. The temperature diagnostic is the filter ratio of the extreme-ultraviolet 171 and 195 Å passbands. The emission-measure diagnostic is the count rate in the 171 Å passband. We find essentially no temperature variation along the loops. We compare the observed loop structure with theoretical isothermal and nonisothermal static loop structure.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 1999
- DOI:
- 10.1086/312045
- arXiv:
- arXiv:astro-ph/9903491
- Bibcode:
- 1999ApJ...517L.155L
- Keywords:
-
- SUN: CORONA;
- SUN: UV RADIATION;
- Sun: Corona;
- Sun: UV Radiation;
- Astrophysics
- E-Print:
- 10 pages, 3 postscript figures (LaTeX, uses aaspp4.sty). Accepted by ApJ Letters