[GTP] Seminar at NCAR, Steven Balbus ENS-Canceled

[Silvia Gentile]

Due to Dr. Balbus' health problems this seminar has been canceled.

Silvia Genitle

Silvia Gentile wrote:
> 

> SEMINAR
> 
> 
> Differential Rotation and Convection in the Sun
> Steven Balbus
> Radio Astrononmy Laboratory
> École Normale Supérieure, Paris
> 
> 
> 
> The differential rotation profile of the solar convection zone (SCZ), 
> apart from inner and outer boundary layers, can be accurately reproduced 
> if the isorotation contours correspond to the characteristics of the 
> vorticity equation in its thermal wind form.  The analytic structure of 
> these characteristics is transparent, and surprisingly simple.
> The very existence of the characteristics, however, requires that there 
> be a formal functional relationship involving the entropy and the 
> angular velocity. In this talk, I will specify this relationship, and 
> explain how it may arise naturally from the dynamics of convection and 
> differential rotation.  Direct support for the entropy/angular velocity 
> relationship can be adduced from published numerical simulations of the 
> SCZ.  More generally, this "thermal wind characteristic theory" can also 
> be used diagnostically for the internal entropy structure of the SCZ, 
> and may be extended to fully convective stars of low convective Rossby 
> number.
> 
> 
> 
> November 12, 2009
> Foothills Laboratory 2 (3450 Mitchell Lane)
> Main Auditorium (Room 1022)
> Lecture 1:30pm
> 
>