Vertical oscillations of an arcade loop in a gravitationally stratified solar corona

Details Vertical oscillations of an arcade loop in a gravitationally stratified solar corona Vertical oscillations of an arcade loop in a gravitationally stratified solar corona

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...487..717g&link_type=abstract

Astronomy and Astrophysics, Volume 487, Issue 2, 2008, pp.717-721

Astronomy and Astrophysics

Astrophysics

4

Magnetohydrodynamics (Mhd), Sun: Corona, Sun: Oscillations

Scientific paper

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.

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