GELLY , B.

Context. Radial differential rotation is an important physical ingredient in stellar dynamo theory. In the case of the Sun, heliosismology techniques have revealed the existence of a near-surface shear layer covering 15–20% of the upper convection zone. It was recently shown that the rotation velocity gradient is not uniform in this layer and...

Exploding granules constitute the strongest horizontal flows on the quiet Sun and contribute to the structure of the surface horizontal velocity fields which build the large-scale organization of the discrete magnetic field. In this work we explore exploding granule expansion through the observations of the ground-based THEMIS telescope, IRIS,...

Astronomische Nachrichten, 329, pp. 508-516, http://dx.doi.org./10.1002/asna.200710986

Astron. & Astrophys., 413, pp. 1135-1142 (2004)

Astronomy and Astrophysics, 506, pp. 1415-1428 (2009)

Astronomy and Astrophysics, 474, pp. 1073-1080, http://dx.doi.org./10.1051/0004-6361:20067019

International audience

The solar magnetism is no more considered as a purely superficial phenomenon. The SoHO community has shown that the length of the solar cycle depends on the transition region between radiation and convection. Nevertheless, the internal solar (stellar) magnetism stays poorly known. Starting in 2008, the American instrument HMI/SDO and the...

International audience