Evidence That a Deep Meridional Flow Sets the Sunspot Cycle Period

By D. Hathaway, Dibyendu Nandy, R. Wilson, E. Reichmann. 2003

154 citations recorded by the source corpus.

Subfields: Artificial Intelligence, Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/0d7e15ced4bb47410136d2a3b75635629c4f9639

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ON THE WEAKENING OF THE POLAR MAGNETIC FIELDS DURING SOLAR CYCLE 23 (2009, background): “◦13(Δt)2 (4) (based on Figure 2 of Hathaway et al. 2003), where Δt is the time in years since the start of the given cycle.”
Dynamo Models of the Solar Cycle (2005, background): “…to the observable surface meridional flow speed via the mass conservation constraint; although uncertainties remain at that level, the analysis of Hathaway et al. (2003) supports the idea that the cycle period is indeed set by the meridional flow speed (but do see Schmitt and Schüssler, 2004,…”
Does the butterfly diagram indicate a solar flux-transport dynamo? (2004, background): “This casts doubt upon the suggestion of Hathaway et al. (2003) that these properties provide observational evidence for a flux-transport dynamo based upon an equatorward meridional flow in the deep convection zone and that this flow sets the cycle period.”
Solar activity forecast with a dynamo model (2007, background): “Although the period of a flux transport dynamo is determined mainly by the meridional flow speed (Dikpati & Charbonneau 1999; Hathaway et al. 2003) and this flow speed is known to vary, the detailed time variation is known only since 1996 (Gizon 2004).”
The Solar Cycle (2007, methodology): “While Hathaway et al. (2003) investigated the latitude positions as functions of time relative to the date of maximum for each cycle, the data show far less scatter when plotted relative to the time of minimum.”
What the Sunspot Record Tells Us About Space Climate (2004, background): “The drift rates of the centroid of sunspot area in each hemisphere (Hathaway et al., 2003, 2004) provide early estimates for both the timing and amplitude of future cycles (Section 4 and Figure 5).”
Exploring the Physical Basis of Solar Cycle Predictions: Flux Transport Dynamics and Persistence of Memory in Advection- versus Diffusion-dominated Solar Convection Zones (2007, background): “Through an analysis of observational data, Hathaway et al. (2003) have shown that the solar cycle amplitude and duration are correlated with the equatorward drift velocity of the sunspot belts during the cycle.”
Local Helioseismology: Three-Dimensional Imaging of the Solar Interior (2010, background): “Hathaway et al. (2003) argued that the equatorward drift of sunspots during the course of the solar cycle (the butterfly diagram) implies the existence of a 1.2 m s−1return flow at the bottom of the convection zone.”
Predicting the strength of solar cycle 24 using a flux‐transport dynamo‐based tool (2006, methodology): “For still earlier times, only the method described by Hathaway et al. [2003] is available, and we (M. Dikpati et al., manuscript in preparation, 2006) are exploring that, but it uses magnetic information from each cycle to estimate the meridional flow for that cycle, so it is not truly independent”
The Solar Cycle (2010, background): “They found that cycles with higher drift rates at maximum tended to have shorter periods and larger amplitudes but with a better correlation between drift rate and the amplitude of the N+2 cycle (Hathaway et al., 2004).”
Full-sphere simulations of a circulation-dominated solar dynamo: Exploring the parity issue (2004, background): “6.2 in Choudhuri 2003a; Hathaway et al. 2003).”
Modeling the Sun’s Magnetic Field and Irradiance since 1713 (2005, background): “2 of Hathaway et al. 2003), where t is the time in years since the start of the given cycle.”