Coronal Seismology and the Propagation of Acoustic Waves Along Coronal Loops

Details Coronal Seismology and the Propagation of Acoustic Waves Along Coronal Loops Coronal Seismology and the Propagation of Acoustic Waves Along Coronal Loops

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh24a..06k&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH24A-06

Physics

7509 Corona, 7549 Ultraviolet Emissions, 7594 Instruments And Techniques, 7859 Transport Processes, 7871 Waves And Instabilities

Scientific paper

We use a combination of analytical theory, numerical simulation, and data analysis to study the propagation of acoustic waves along coronal loops. We show that the intensity perturbation of a wave depends on a number of factors, including dissipation of the wave energy, pressure and temperature gradients in the loop atmosphere, work action between the wave and a flow, and the sensitivity properties of the observing instrument. In particular, the scale length of the intensity perturbation varies directly with the dissipation scale length (i.e., damping length) and the scale lengths of pressure, temperature, and velocity. We simulate wave propagation in three different equilibrium loop models and find that dissipation and pressure and temperature stratification are the most important effects in the low corona where the waves are most easily detected. Velocity effects are small, and cross-sectional area variations play no direct role for lines-of-sight that are normal to the loop axis. The intensity perturbation scale lengths in our simulations agree very well with the scale lengths we measure in a sample of loops observed by TRACE. The median observed value is 4.35×109 cm. In some cases the intensity perturbation increases with height, which is likely an indication of a temperature inversion in the loop (i.e., temperature that decreases with height). Our most important conclusion is that thermal conduction, the primary damping mechanism, is accurately described by classical transport theory. There is no need to invoke anomalous processes to explain the observations.

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