The QBO-type signals in the subsurface flow fields during solar cycles 23 and 24

Abstract

We studied the presence and spatiotemporal evolution of the quasi-biennial oscillations (QBOs) in the rotation rate residuals at target depths of 0.90$R_{\odot }$, 0.95$R_{\odot }$, and 0.99$R_{\odot }$ and at low (0 -- 30${}^{\circ }$), mid (30 -- 50${}^{\circ }$), and high (50 -- 70${}^{\circ }$) latitudinal bands. To achieve these objectives we used data from the Michelson Doppler Imager (MDI) on {\it the Solar and Heliospheric Observatory} ({\it SOHO}) and the Helioseismic and Magnetic Imager (HMI) on the {\it Solar Dynamics Observatory} ({\it SDO}), covering solar cycles 23 and 24, respectively. The results show that there are QBO-like signals in each latitudinal band and depth however they are affected by higher amplitude and longer-time scale variations. The QBO-like signals found in each target depth and latitudinal bands show different spatiotemporal evolution. The amplitudes of variations of the rotation rate residuals in the QBO timescale increase with increasing depth.

References in corpus (3)

• Nonlinear dynamo models using quasi-biennial oscillations constrained by sunspot area data
• Phase and amplitude asymmetry in the quasi-biennial oscillation of solar Halpha flare activity
• The spatial distribution of quasi-biennial oscillations in the high-latitude solar activity

Cited by in corpus (4)

• Cycle dependency of a quasi-biennial variability in the solar interior
• Temporal evolutions and quasi-periodic variations present in the sunspot number and group sunspot area data measured at Kodaikanal Observatory for solar cycles 14 to 24
• Seismic differences between solar magnetic cycles 23 and 24 for low-degree modes
• Causal Interaction between the subsurface rotation rate residuals and radial magnetic field in different timescales