Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...498..863w&link_type=abstract
Astronomy and Astrophysics, Volume 498, Issue 3, 2009, pp.863-868
Astronomy and Astrophysics
Astrophysics
1
Magnetohydrodynamics (Mhd), Sun: Corona, Sun: Oscillations
Scientific paper
Aims: We investigate impulsive excitation mechanisms of the first harmonic fast magnetoacoustic kink mode of vertical oscillations in a solar coronal loop, which is approximated by either a straight slab or a curved arcade slab. Methods: We solve numerically the full set of nonlinear ideal two-dimensional magnetohydrodynamic equations and analyze temporal and spatial wave signatures to infer characteristic features, such as waveperiods and node positions. Results: We show that an initial velocity pulse located off-center excites the first harmonic and fundamental modes, which result in a movement of the node around the loop apex. These results are verified by the analytical findings for an elastic string. Conclusions: Since the fundamental mode acquires more energy than its first harmonic, this explains why the latter is so rarely detected within a coronal loop.
Murawski Kris
Wasiljew A.
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