Large-scale horizontal flows in the solar photosphere I: Method and tests on synthetic data

Abstract

We propose a useful method for mapping large-scale velocity fields in the solar photosphere. It is based on the local correlation tracking algorithm when tracing supergranules in full-disc dopplergrams. The method was developed using synthetic data. The data processing the data are transformed during the data processing into a suitable coordinate system, the noise is removed, and finally the velocity field is calculated. Resulting velocities are compared with the model velocities and the calibration is done. From our results it becomes clear that this method could be applied to full-disc dopplergrams acquired by the Michelson Doppler Imager (MDI) onboard the Solar and Heliospheric Observatory (SoHO).

Accepted in Astronomy and Astrophycics

References in corpus (1)

• Representations of celestial coordinates in FITS

Cited by in corpus (18)

• The Sun's Supergranulation
• Systematic Center-to-Limb Variation in Measured Helioseismic Travel Times and Its Effect on Inferences of Solar Interior Meridional Flows
• Comparison of large-scale flows on the Sun measured by time-distance helioseismology and local correlation tracking technique
• Magnetic swirls and associated fast magnetoacoustic kink waves in a solar chromospheric flux tube
• Comparison of solar surface flows inferred from time--distance helioseismology and coherent structure tracking using HMI/SDO observations
• Physical Origin of Differences among various Measures of Solar Meridional Circulation
• Large-scale horizontal flows in the solar photosphere III: Effects on filament destabilization
• Large-scale photospheric motions determined from granule tracking and helioseismology from SDO/HMI data
• Observing dynamos in cool stars
• Large-scale horizontal flows in the solar photosphere II: Long-term behaviour and magnetic activity response
• Anti-solar differential rotation and surface flow pattern on UZ Librae
• Structure and evolution of solar supergranulation using SDO/HMI data
• Theory of Solar Meridional Circulation at High Latitudes
• Large-scale horizontal flows in the solar photosphere V: Possible evidence for the disconnection of bi-polar sunspot groups from their magnetic roots
• Large-scale horizontal flows in the solar photosphere. IV. On the vertical structure of large-scale horizontal flows
• Surface velocity network with anti-solar differential rotation on the active K-giant $\sigma$ Geminorum
• Meridional Circulation From Differential Rotation in an Adiabatically Stratified Solar/Stellar Convection Zone
• Testing volume integrals of travel-time sensitivity kernels for flows