Influence of Low-Degree High-Order p-Mode Splittings on the Solar Rotation Profile

Abstract

The solar rotation profile is well constrained down to about 0.25 R thanks to the study of acoustic modes. Since the radius of the inner turning point of a resonant acoustic mode is inversely proportional to the ratio of its frequency to its degree, only the low-degree p modes reach the core. The higher the order of these modes, the deeper they penetrate into the Sun and thus they carry more diagnostic information on the inner regions. Unfortunately, the estimates of frequency splittings at high frequency from Sun-as-a-star measurements have higher observational errors due to mode blending, resulting in weaker constraints on the rotation profile in the inner core. Therefore inversions for the solar internal rotation use only modes below 2.4 mHz for l < 4. In the work presented here, we used an 11.5 year-long time series to compute the rotational frequency splittings for modes l < 4 using velocities measured with the GOLF instrument. We carried out a theoretical study of the influence of the low-degree modes in the region 2 to 3.5 mHz on the inferred rotation profile as a function of their error bars.

Accepted for publication in Solar Physics. 17 Pages, 9 figures

References in corpus (3)

• Sensitivity of helioseismic gravity modes to the dynamics of the solar core
• solarFLAG hare and hounds: on the extraction of rotational p-mode splittings from seismic, Sun-as-a-star data
• Sensitivity analysis of the solar rotation to helioseismic data from GONG, GOLF and MDI observations

Cited by in corpus (9)

• Asteroseismology of solar-type stars
• Sensitivity of helioseismic gravity modes to the dynamics of the solar core
• The Solar-Stellar Connection
• Magnetic signatures on mixed-mode frequencies. I. An axisymmetric fossil field inside the core of red giants
• Combined analysis of solar neutrino and solar irradiance data: further evidence for variability of the solar neutrino flux and its implications concerning the solar core
• Evidence for R-Mode Oscillations in Super-Kamiokande Solar Neutrino Data
• Solar neutrino variability and its implications for solar physics and neutrino physics
• On the solar origin of the signal at 220.7microHz: A possible component of a g mode?
• Using Lithium and Beryllium to Study Structure and Evolution of Rotating Stars