TY - JOUR
T1 - Multiple scattering of seismic waves from ensembles of upwardly lossy thin flux tubes
AU - Hanson, Christopher Smedley
AU - Cally, Paul Stuart
PY - 2015
Y1 - 2015
N2 - Our previous semi-analytic treatment of f f - and p p -mode multiple scattering from ensembles of thin flux tubes (Hanson and Cally, Astrophys. J.781, 125, 2014a; 791, 129, 2014b) is extended by allowing both sausage and kink waves to freely escape at the top of the model using a radiative boundary condition there. As expected, this additional avenue of escape, supplementing downward loss into the deep solar interior, results in substantially greater absorption of incident f f - and p p -modes. However, less intuitively, it also yields mildly to substantially smaller phase shifts in waves emerging from the ensemble. This may have implications for the interpretation of seismic data for solar plage regions, and in particular their small measured phase shifts.
AB - Our previous semi-analytic treatment of f f - and p p -mode multiple scattering from ensembles of thin flux tubes (Hanson and Cally, Astrophys. J.781, 125, 2014a; 791, 129, 2014b) is extended by allowing both sausage and kink waves to freely escape at the top of the model using a radiative boundary condition there. As expected, this additional avenue of escape, supplementing downward loss into the deep solar interior, results in substantially greater absorption of incident f f - and p p -modes. However, less intuitively, it also yields mildly to substantially smaller phase shifts in waves emerging from the ensemble. This may have implications for the interpretation of seismic data for solar plage regions, and in particular their small measured phase shifts.
KW - Helioseismology, theory
KW - Waves, magnetohydrodynamic
UR - http://link.springer.com/content/pdf/10.1007%2Fs11207-015-0732-x.pdf
U2 - 10.1007/s11207-015-0732-x
DO - 10.1007/s11207-015-0732-x
M3 - Article
SN - 0038-0938
VL - 290
SP - 1889
EP - 1896
JO - Solar Physics
JF - Solar Physics
IS - 7
ER -