Speaker
Description
Particular attention has recently been paid to the near solar subsurface layer, known as NSSL. On the one hand, because of the disruptive role of the magnetic field, whose properties are still far from fully understood in this region. Secondly, because of some unsuspected properties of solar rotation that have been also recently put in evidence, notably the reversal of the rotation gradient towards latitudes close to 60°. These two aspects, well identified by HMI's results on SDO, clearly highlight the role of subsurface magnetism. The NSSL could thus be divided into at least two layers (perhaps three) one of which, the leptocline (from Greek “letpos”, thin and “klino”, slope, by analogy with the tachocline “tachos”, speed), would be the seat of numerous solar phenomena. Also a link explaining some properties of the solar gravitational moment. Here, we highlights the role of this shallow and sharp rotational shear layer lying from the surface to around 8 Mm in depth. Indeed, this layer could be the seat of many solar physical processes leading to a new vision of the structure and dynamics of the Sun. In such a way, it is not impossible, that this zone will play a significant role in the shaping of the solar activity cycles.
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