Solar dynamics, asphericities and gravitational moments: present state of the art

Details Solar dynamics, asphericities and gravitational moments: present state of the art Solar dynamics, asphericities and gravitational moments: present state of the art

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..17e..10r&link_type=abstract

Highlights of Recent Progress in the Seismology of the Sun and Sun-Like Stars, 26th meeting of the IAU, Joint Discussion 17, 23

Physics

Scientific paper

Solar gravitational moments J[n] reflect the internal non-homogeneous mass distribution and non-uniform angular velocity (function of the radial distance to the center and of the latitude). The result is the complex outer shape of the Sun, described by shape coefficients c[n] , also referred to as asphericities. The study of solar gravitational moments is not only crucial for solar physics, but also for astrometry (when computing light deflection in the vicinity of the Sun), celestial mechanics: relativistic precession of planets, planetary orbit inclination and spin-orbit couplings) and for future tests of alternative theories of gravitation (correlation of J[2] with Post-Newtonian parameters). A variability of c[n] and J[n] might be due to the temporal variation of the internal structure and the angular velocity which is known at the surface down to the tachocline. Applying helioseismic inversions just below the surface, new results have been obtained showing temporal variations with solar activity inside the surface layers. Regarding the solar core dynamics, the subject is of high priority for new investigations. Space-dedicated missions, such as Golf-NG/Dynamics in a joint effort with SDO (Solar Dynamics Observatory), should provide a new insight on the question.

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