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Title:
An Estimate of P-Mode Damping by Wave Leakage
Authors:
De Moortel, I.; Rosner, R.
Affiliation:
AA(School of Mathematics and Statistics, University of St Andrews), AB(Enrico Fermi Institute, The University of Chicago)
Publication:
Solar Physics, Volume 246, Issue 1, pp.53-63 (SoPh Homepage)
Publication Date:
11/2007
Origin:
SPRINGER
Keywords:
MHD: oscillations, Corona, Activity
DOI:
10.1007/s11207-007-0392-6
Bibliographic Code:
2007SoPh..246...53D

Abstract

High-cadence TRACE observations show that outward-propagating intensity disturbances are a common feature in large, quiescent coronal loops. Analysis of the frequency distribution of these modes shows peaks at both three- and five-minute periods, indicating that they may be driven by the solar surface oscillations ( p modes). The energy flux contained within the coronal intensity disturbances is of the order of (1.1±0.4)×103 ergs cm‑2 s‑1. A simple order-of-magnitude estimate of the damping rate of the relevant p modes allows us to put an observational constraint on the damping of p modes and shows that leakage into the overlying coronal atmosphere might be able to account for a significant fraction of p-mode damping.
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Database: Astronomy
Physics
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