title: Deeply Penetrating Banded Zonal Flows in the Solar Convection Zone.
abstract: Helioseismic observations have detected small temporal variations of the rotation rate below the solar surface that correspond to the so-called "torsional oscillations" known from Doppler measurements of the surface. These appear as bands of slower- and faster-than-average rotation moving equatorward. Here we establish, using complementary helioseismic observations over 4 yr from the GONG network and from the MDI instrument on board SOHO, that the banded flows are not merely a near-surface phenomenon: rather, they extend downward at least 60 Mm (some 8% of the total solar radius) and thus are evident over a significant fraction of the nearly 200 Mm depth of the solar convection zone.
authors.initials: R
authors.lastname: Howe
authors.initials: J
authors.lastname: Christensen-Dalsgaard
authors.initials: F
authors.lastname: Hill
authors.initials: RW
authors.lastname: Komm
authors.initials: RM
authors.lastname: Larsen
authors.initials: J
authors.lastname: Schou
authors.initials: MJ
authors.lastname: Thompson
authors.initials: J
authors.lastname: Toomre