Torsional Oscillation, Meridional Flows, and Vorticity Inferred in the Upper Convection Zone of the Sun by Time-Distance Helioseismology

By Junwei Zhao, Alexander G. Kosovichev. 2004

305 citations recorded by the source corpus.

View Paper: https://www.semanticscholar.org/paper/f5d89235c32afccc5962cad655b7a9d9f2915218

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

Citations in the corpus

Solar Interior Rotation and its Variation (2009, unknown): “Zhao and Kosovichev (2004) measured the zonal (Figure 29 right) and meridional flows with the time-distance technique, and reported meridional flow converging on the activity belts above a depth of 12Mm, with diverging flows below 18Mm, forming circulation cells around the activity belts.”
Sunspot Group Tilt Angles and the Strength of the Solar Cycle (2010, background): “The time dependent meridional flow includes an inflow towards the active region belts (Zhao & Kosovichev, 2004) which had an amplitude of±5m/s for cycle 23.”
Structure and Evolution of Giant Cells in Global Models of Solar Convection (2007, background): “Determinations of the solar meridional circulation from surface measurements and helioseismic inversions are generally averaged over at least one rotation period (Komm et al. 1993; Hathaway 1996; Braun & Fan 1998; Haber et al. 2002, 2004; Zhao & Kosovichev 2004; González-Hernandez et al. 2006).”
DETECTION OF EQUATORWARD MERIDIONAL FLOW AND EVIDENCE OF DOUBLE-CELL MERIDIONAL CIRCULATION INSIDE THE SUN (2013, background): “…as measured by tracer tracking (e.g., Komm et al. 1993;Švanda et al. 2007; Hathaway & Rightmire 2010), direct Doppler-shift observations (e.g., Ulrich 2010), and localhelioseismology analyses (e.g., Giles et al. 1997; Haber et al. 2002; Zhao & Kosovichev 2004; González Hernández et al. 2008).”
Solar Differential Rotation Influenced by Latitudinal Entropy Variations in the Tachocline (2006, background): “The meridional circulation near the surface of the Sun is generally poleward at latitudes<60 with an amplitude of 15– 20m s 1, but it fluctuates substantially over the course of months and years (Hathaway 1996; Snodgrass & Dailey 1996; Haber et al. 2002; Basu & Antia 2003; Zhao & Kosovichev 2004).”
Local Helioseismology: Three-Dimensional Imaging of the Solar Interior (2010, methodology): “At depths in the range of about 10 Mm to 15 Mm, diverging flows from active regions have been inferred using the time-distance (Zhao & Kosovichev 2004) and ring-diagram (Haber et al. 2004) methods.”
Solar Differential Rotation and Meridional Flow: The Role of a Subadiabatic Tachocline for the Taylor-Proudman Balance (2005, background): “This flow was first observed through movements of active regions and magnetic filaments (Labonte & Howard 1982; Topka et al. 1982) and later confirmed through helioseismology (see, e.g., Braun & Fan 1998; Haber et al. 2002; Zhao & Kosovichev 2004).”
Dynamo Models of the Solar Cycle (2005, background): “85 (Schou and Bogart, 1998; Braun and Fan, 1998), without significant departure from the poleward direction except locally and very close to the surface, in the vicinity of active region belts (Haber et al., 2002; Basu and Antia, 2003; Zhao and Kosovichev, 2004).”
Flux-Transport Dynamos with Lorentz Force Feedback on Differential Rotation and Meridional Flow: Saturation Mechanism and Torsional Oscillations (2006, background): “The idea of thermal forcing of the low latitude branch is also consistent with a mean inflow into the active region belt of the order of 5 ms−1 that has been observed in magnetograms (Komm et al. 1993; Komm 1994) and inferred from helioseismology (Zhao & Kosovichev 2004).”
ON THE WEAKENING OF THE POLAR MAGNETIC FIELDS DURING SOLAR CYCLE 23 (2009, background): “…active regions, the diffusive transport also tends to mask out variations in the flow speed within each cycle; helioseismic measurements (see, e.g., Zhao & Kosovichev 2004) suggest that these variations have an amplitude of order 5 m s−1 and that the associated residual flows act in the direction…”