Analysis of the cross-sectional form of coronal loops: properties and temporal behavior.
Abstract
Observations of EUV lines provide evidence of the radial temperature dependence of coronal loops, with the highest temperature at the outer part of a loop. Here the authors investigate the cross-sectional properties of the temperature for both hot and cool loops. It is found that the radial dependence of the temperature for both types of loops has the same general characteristics, and this enables to draw some general conclusions about the thermodynamic quantities that characterize these loops. From this general picture for an idealized loop, the authors investigate its evolution for different levels of energy input, which is considered to be derived from photospheric motions of the feet of the loop. Based on this, a common scenario for coronal loop temporal behavior is described. It provides an interpretation of the difference in lifetimes of hot and cool loops and of the gradual fading of post flare coronal loops in time.
- Publication:
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JOSO Annu. Rep., 1997
- Pub Date:
- 1998
- Bibcode:
- 1998joso.proc..110K
- Keywords:
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- Solar Coronal Loops: Cross Sections;
- Solar Coronal Loops: Thermodynamics