An Estimate of P-Mode Damping by Wave Leakage
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.
- Publication:
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Solar Physics
- Pub Date:
- November 2007
- DOI:
- 10.1007/s11207-007-0392-6
- Bibcode:
- 2007SoPh..246...53D
- Keywords:
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- MHD: oscillations;
- Corona;
- Activity