Dissipation of Standing Slow Magnetoacoustic Waves in Hot Coronal Loops

Details Dissipation of Standing Slow Magnetoacoustic Waves in Hot Coronal Loops Dissipation of Standing Slow Magnetoacoustic Waves in Hot Coronal Loops

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007soph..246..187s&link_type=abstract

Solar Physics, Volume 246, Issue 1, pp.187-212

Physics

9

Sun: Activity, Sun: Corona, Sun: Oscillations, Hydrodynamics

Scientific paper

The damping of standing slow waves in hot ( T>6 MK) coronal loops of semicircular shape is revisited in both the linear and nonlinear regimes. Dissipation by thermal conduction, compressive viscosity, radiative cooling, and heating are examined for nonstratified and stratified loops. We find that for typical conditions of hot SUMER loops, thermal conduction increases the period of damped oscillations over the sound-crossing time, whereas the decay times are mostly shaped by compressive viscosity. Damping from optically thin radiation is negligible. We also find that thermal conduction alone results in slower damping of the density and velocity waves compared to the observations. Only when compressive viscosity is added do these waves damp out at the same rate as the observed rapidly decaying modes of hot SUMER loop oscillations, in contrast to most current work, which has pointed to thermal conduction as the dominant mechanism. We compare the linear predictions with numerical hydrodynamic calculations. Under the effects of gravity, nonlinear viscous dissipation leads to a reduction of the decay time compared to the homogeneous case. In contrast, the linear results predict that the damping rates are barely affected by gravity.

Affiliated with

Also associated with

No associations

Rating

Dissipation of Standing Slow Magnetoacoustic Waves in Hot Coronal Loops does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dissipation of Standing Slow Magnetoacoustic Waves in Hot Coronal Loops, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dissipation of Standing Slow Magnetoacoustic Waves in Hot Coronal Loops will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1546891