Sensitivity of helioseismic gravity modes to the dynamics of the solar core

Details Sensitivity of helioseismic gravity modes to the dynamics of the solar core Sensitivity of helioseismic gravity modes to the dynamics of the solar core

2008-03-27

arxiv.org/abs/0803.3966v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A, 8 pages, 11 figures

Scientific paper

10.1051/0004-6361:20078839

The dynamics of the solar core cannot be properly constrained through the analysis of acoustic oscillation modes. Gravity modes are necessary to understand the structure and dynamics of the deepest layers of the Sun. Through recent progresses on the observation of these modes -- both individually and collectively -- new information could be available to contribute to inferring the rotation profile down inside the nuclear burning core. To see the sensitivity of gravity modes to the rotation of the solar core. We analyze the influence of adding the splitting of one and several g modes to the data sets used in helioseismic numerical inversions. We look for constraints on the uncertainties required in the observations in order to improve the derived core rotation profile. We compute forward problems obtaining three artificial sets of splittings derived for three rotation profiles: a rigid profile taken as a reference, a step-like and a smoother profiles with higher rates in the core. We compute inversions based on Regularized Least-Squares methodology (RLS) for both artificial data with real error bars and real data. Several sets of data are used: first we invert only p modes, then we add one and several g modes to which different values of observational uncertainties (75 and 7.5 nHz) are attributed. For the real data, we include g-mode candidate, l=2, n=-3 with several splittings and associated uncertainties. We show that the introduction of one g mode in artificial data improves the rate in the solar core and give an idea on the tendency of the rotation profile. The addition of more g modes gives more accuracy to the inversions and stabilize them. The inversion of real data with the g-mode candidate gives a rotation profile that remains unchanged down to 0.2 R, whatever value of splitting we attribute to the g mode.

Affiliated with

Also associated with

No associations

Rating

Sensitivity of helioseismic gravity modes to the dynamics of the solar core 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 Sensitivity of helioseismic gravity modes to the dynamics of the solar core, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sensitivity of helioseismic gravity modes to the dynamics of the solar core will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-354330