| Autor: |
Jain, R., Gascoyne, A., Hindman, B. W. |
| Předmět: |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society; Aug2011, Vol. 415 Issue 2, p1276-1279, 4p, 1 Chart, 2 Graphs |
| Abstrakt: |
BSTRACT We investigate the net effect of a multitude of thin magnetic tubes on the energy of ambient acoustic p modes. A p mode, when incident on a thin magnetic flux tube, excites magnetohydrodynamic (MHD) tube waves. These tube waves propagate vertically along the flux tube carrying away energy from the p-mode cavity resulting in the absorption of incident p-mode energy. We calculate the absorption arising from the excitation of sausage MHD waves within a collection of many non-interacting magnetic flux tubes with differing plasma properties. We find that the shape and magnitude of the absorption, when compared with the observationally measured absorption, favours a model with a maximum-flux boundary condition applied at the photosphere and a narrow distribution of plasma β in an ensemble with mean β value between 0.5 and 1. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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