The solar oblateness and its relationship with the structure of the tachocline and of the Sun's subsurface

Details The solar oblateness and its relationship with the structure of the tachocline and of the Sun's subsurface The solar oblateness and its relationship with the structure of the tachocline and of the Sun's subsurface

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...355..365g&link_type=abstract

Astronomy and Astrophysics, v.355, p.365-374 (2000)

Astronomy and Astrophysics

Astrophysics

26

Sun: Fundamental Parameters, Sun: Interior, Sun: Rotation, Sun: Transition Region

Scientific paper

The solar oblateness varepsilon was computed with a dynamical up-to-date solar model of mass and density, combined with a recent rotational model established from the helioseismic data, and including the effects of differential rotation with depth. To determine the theoretical value of the oblateness varepsilon of the Sun, we integrated the extended differential equation governing the fluids in hydrostatic equilibrium and the Poisson equation for the gravitational potential. From this analysis, we deduced the profiles of varepsilon , as a function of the radius and of the latitude, from the core to the surface, for a Sun splitted into a series of concentric shells. As each shell is affected by a potential distortion, mainly due to the rotation, and as the rotation rate depends on the radius and on the latitude, each shell of the Sun is affected by a different oblateness. As a result of the integration of this function, we found varepsilon =8.77.10-6, that we compared to the oblateness of a rigidly rotating sphere. To interprete the difference in oblateness varepsilon of the studied layers within the Sun, we linked the profiles to the solar interior structures, specially to the tachocline and to the subsurface, that help us to understand why and how these regions are mainly governed by shear. In particular, we propose for these two layers a double structure, one where the magnetic field would be stored and one of shear. Finally, we compared our results of radial integrated oblateness with the latitudinal variation of the semidiameter from solar astrolabe observations.

Affiliated with

Also associated with

No associations

Rating

The solar oblateness and its relationship with the structure of the tachocline and of the Sun's subsurface does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The solar oblateness and its relationship with the structure of the tachocline and of the Sun's subsurface, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The solar oblateness and its relationship with the structure of the tachocline and of the Sun's subsurface will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1428398