Solar gravitational moments and solar core dynamics

Details Solar gravitational moments and solar core dynamics Solar gravitational moments and solar core dynamics

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..121p&link_type=abstract

SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli

Physics

1

Scientific paper

Solar gravitational moments (Jn) 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 (cn, 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 J2 with Post-Newtonian parameters). A variability of cn and Jn might be due to the temporal variation of the angular velocity which is known at the surface down to the tachocline. Regarding core dynamics, the subject is still under investigation. Space-dedicated missions, such as Golf-NG in a joint effort with SDO, should provide a new insight on the question.

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