Volume 488, Number 2, September III 2008
|Page(s)||757 - 761|
|Published online||24 June 2008|
Standing fast magnetoacoustic kink waves of solar coronal loops with field-aligned flow
Group of Astrophysics and Gravity Theory, Institute of Physics, UMCS, ul. Radziszewskiego 10, 20-031 Lublin, Poland e-mail: firstname.lastname@example.org
2 The Catholic University of America, NASA Goddard Space Flight Centre, Code 671, Greenbelt, MD 20771, USA
Accepted: 6 June 2008
Aims. We refer to the recent observational data of Hinode, which detected weakly-attenuated coronal loop oscillations in the presence of background flow (Ofman & Wang 2008, A&A, 482, L9). Vertical loop oscillations that lasted for three wave periods were reported with a wave period P = 113 ± 2 s, attenuation time τ = 560 ± 260 s, and wave amplitude = 0.67 ± 0.12 Mm. Ofman & Wang (2008) estimated the flow speed within the range of 74–123 km s-1. We consider impulsively generated standing fast magnetoacoustic kink waves of a straight solar coronal slab with field-aligned internal flow. We aim to determine the influence of such flow on the spatial and temporal signatures of these waves.
Methods. The time-dependent, ideal magnetohydrodynamic equations are solved numerically.
Results. The numerical results show that as a result of wave scattering on inhomogeneous flow kink waves experience stronger attenuation than for a still plasma, while P remains weakly altered by this flow. Numerically evaluated values of and P are close to the observational data. A value of is about two times smaller than observed.
Key words: magnetohydrodynamics (MHD) / Sun: corona / Sun: oscillations
© ESO, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.