COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring. |

University of Cambridge > Talks.cam > DAMTP Astrophysics Seminar > Internally-driven inertial waves in geodynamo simulations

## Internally-driven inertial waves in geodynamo simulationsAdd to your list(s) Download to your calendar using vCal - Avishek Ranjan (Engineering)
- Tuesday 07 March 2017, 13:00-14:00
- MR14, Centre for Mathematical Sciences, Wilberforce Road, Cambridge.
If you have a question about this talk, please contact Robert Teed. Inertial waves are oscillations in a rotating fluid, such as the Earth’s outer core, which result from the restoring action of the Coriolis force and conservation of angular momentum. Particularly important are the low-frequency inertial waves that are known to create Taylor columns above a moving body in a rotating tank. They also create columnar flow structures above/below a localized layer of buoyancy. We report, for the first time, internally-driven inertial waves triggered by buoyant anomalies near the equator in a strongly-forced geodynamo simulation at Ra/Ra_c=42 and E=3×10^{-5}. Using the vertical acceleration as a diagnostic for wave-fronts, we find that a horizontal movement of buoyant anomalies near the equator is well-correlated with a corresponding movement far from the equator. Moreover, we find that the slopes observed in the time-series of vertical acceleration match closely with those expected from the group speed of low-frequency inertial waves. The azimuthally-averaged spectrum of vertical acceleration lies in the inertial wave frequency range. Our results suggest that the columnar flow in the rotation-dominated core, an important ingredient for the maintenance of a dipolar magnetic field, is maintained on a fast-time scale by internally-driven inertial waves, and not by boundary-driven Busse rolls as previously thought. The dynamical role of inertial waves, particularly with regards to their helicity segregation characteristic, is under investigation. This talk is part of the DAMTP Astrophysics Seminar series. ## This talk is included in these lists:- All CMS events
- CMS Events
- Cosmology, Astrophysics and General Relativity
- DAMTP Astrophysics Seminar
- DAMTP info aggregator
- MR14, Centre for Mathematical Sciences, Wilberforce Road, Cambridge
Note that ex-directory lists are not shown. |
## Other listsWolfson College Informal Lunch-time Seminars SCAMPS 09 - One day Symposium Plant Sciences Talks## Other talksBiodiversity offsetting and the construction of "Equivalent natures": A Marxist critique A domain-decomposition-based model reduction method for convection-diffusion equations with random coefficients Title: â€˜The Importance of Being Observantâ€™ Propagation of Very Low Frequency Emissions from Lightning Amphibian Evolution through Deep Time: Fossils, Genes and Regeneration Public Lecture: Development of social behaviour in children from infancy: neurobiological, relational and situational interactions |