| Issue |
A&A
Volume 487, Number 2, August IV 2008
|
|
|---|---|---|
| Page(s) | 717 - 721 | |
| Section | The Sun | |
| DOI | https://doi.org/10.1051/0004-6361:20079266 | |
| Published online | 09 June 2008 | |
Vertical oscillations of an arcade loop in a gravitationally stratified solar corona
Group of Astrophysics and Gravity Theory, Institute of Physics, UMCS, ul. Radziszewskiego 10, 20-031 Lublin, Poland e-mail: marcingruszecki@wp.pl
Received:
17
December
2007
Accepted:
9
May
2008
Aims. We consider impulsively-generated vertical oscillations of an arcade loop that is embedded in the gravitationally-stratified solar corona.
Methods. Two-dimensional magnetohydrodynamic equations are solved numerically in the limit of an ideal plasma.
Results. The numerical results indicate that the effect of gravity produces a decrease in the wave period and an increase in the attenuation time. This decrease is a consequence of a higher Alfvén speed within the gravitationally-stratified arcade loop, while the weaker attenuation reflects a smaller amount of wave tunneling than in the gravity-free case. These results are reminiscent of those for TRACE data.
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.