Rossby waves in the solar convection zone measured by deep-focus time-distance helioseismology
Abstract
Recent work by Loeptien et al. has shown spectral signatures of equatorial Rossby waves in the solar photosphere (via correlation tracking of granulation) and in the outer 20 Mm of the convection zone (via helioseismic ring diagrams). This result is potentially extremely important for understanding convection zone dynamics and as such should be studied by all available techniques. To this end we have searched for these Rossby waves using deep-focus time-distance helioseismology in 8 years of HMI medium resolution (medium l) Dopplergrams. We also see the signatures of equatorial Rossby waves for focus depths of 0 Mm (photosphere) down to 70 Mm below the surface. At 105 Mm (mid convection zone) and 210 Mm (bottom of convection zone) no such signatures are seen, although whether this is a s/n issue is not determined. We will hopefully be able to determine the radial eigenfunctions of the Rossby waves from this type of measurement.
- Publication:
-
Catalyzing Solar Connections
- Pub Date:
- November 2018
- Bibcode:
- 2018csc..confE..57D