Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-03-13
Astron.Astrophys.456:L13,2006
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures
Scientific paper
10.1051/0004-6361:20065805
Observations reveal an increase with height of the line width of several coronal spectral lines probably caused by outwardly propagating Alfv{\'e}n waves. However, the spectral line width sometimes shows a sudden decrease at a height 0.1-0.2 R, where the ratio of sound to Alfven speeds may approach unity. Qualitative analysis shows that the resonant energy conversion from Alfven to acoustic waves near the region of the corona where the plasma $\beta$ approaches unity may explain the observed spectral line width reduction.
Ballester Jose Luis
Oliver Ramon
Zaqarashvili Teimuraz V.
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