TY - GEN
T1 - Probing the Variation with Depth of the Solar Meridional Circulation Using Legendre Function Decomposition
AU - Braun, D. C.
AU - Birch, A.
AU - Fan, Y.
N1 - Publisher Copyright:
© The Editor(s) (if applicable) and The Author(s).
PY - 2020
Y1 - 2020
N2 - We apply the helioseismic methodology of Legendre Function Decomposition to 7.5 years of Dopplergrams obtained by the Helioseismic and Magnetic Imager (HMI) as the basis of inferring the depth variation of the meridional flow between 20◦ and 60◦ latitude in both hemispheres. We assess and remove centerto-limb artifacts using measurements obtained by applying the procedure to pseudo poles at the east and west limbs. Forward modeling is carried out to evaluate the consistency of the corrected frequency shifts with models of the depth variation of the meridional circulation in the top half of the convection zone. The observations are consistent with a return flow in the northern hemisphere below about 40 Mm depth, but no obvious return flow in the south.
AB - We apply the helioseismic methodology of Legendre Function Decomposition to 7.5 years of Dopplergrams obtained by the Helioseismic and Magnetic Imager (HMI) as the basis of inferring the depth variation of the meridional flow between 20◦ and 60◦ latitude in both hemispheres. We assess and remove centerto-limb artifacts using measurements obtained by applying the procedure to pseudo poles at the east and west limbs. Forward modeling is carried out to evaluate the consistency of the corrected frequency shifts with models of the depth variation of the meridional circulation in the top half of the convection zone. The observations are consistent with a return flow in the northern hemisphere below about 40 Mm depth, but no obvious return flow in the south.
UR - https://www.scopus.com/pages/publications/85146669235
U2 - 10.1007/978-3-030-55336-4_15
DO - 10.1007/978-3-030-55336-4_15
M3 - Conference contribution
AN - SCOPUS:85146669235
SN - 9783030553357
T3 - Astrophysics and Space Science Proceedings
SP - 125
EP - 126
BT - Dynamics of the Sun and Stars - Honoring the Life and Work of Michael J. Thompson
A2 - Monteiro, Mário J. P. F. G.
A2 - García, Rafael A.
A2 - Christensen-Dalsgaard, Jørgen
A2 - McIntosh, Scott W.
PB - Springer Science and Business Media B.V.
T2 - Meeting celebrating Michael Thompson's seminal work on solar and stellar physics, 2019
Y2 - 24 September 2019 through 26 September 2019
ER -