DAMIANI , C.

International audience

International audience

Shrinking or expansion of the solar shape and irradiance variations are ultimately related to solar activity. We give here a review on existing ground-based or space solar radius measurements, extending the concept to shape changes. We show how helioseismology results allow us to look at the variations below the surface, where changes are not...

Rotation, and more precisely differential rotation, have a major impact on the internal dynamics of stars (and the Sun) and induce many instabilities driving the transport of angular momentum. In the present paper we shall consider the effects on the shape of shellular layers, and to first order, these concerning the apparent oblateness. The...

We hereby present a review on solar oblateness measurements. By emphasizing historical data, we illustrate how the discordance between experimental results can lead to substantial improvements in the building of new technical apparatus as well as to the emergence of new ideas to develop new theories. We stress out the need to get accurate data...