Un-interrupted Sun-as-a-star Helioseismic Observations over Multiple Solar Cycles
نویسندگان
چکیده
منابع مشابه
Mode visibilities in radial velocity and photometric Sun-as-a-star helioseismic observations⋆
We analyze more than 5000 days of high-quality Sun-as-a-star, radial velocity GOLF and photometric VIRGO/SPM helioseismic observations to extract precise estimates of the visibilities of the low-degree p modes and the m-height ratios of the l = 2 and 3 multiplets in the solar acoustic spectrum. The mode visibilities are shown to be larger during the GOLF red-wing configuration than during the b...
متن کاملDefinitive Sun-as-a-star p-mode frequencies: 23 years of BiSON observations
We present a list of “best possible” estimates of low-degree p-mode frequencies, from 8640 days of observations made by the Birmingham Solar-Oscillations Network (BiSON). This is the longest stretch of helioseismic data ever used for this purpose, giving exquisite precision in the estimated frequencies. Every effort has been made in the analysis to ensure that the frequency estimates are also a...
متن کاملNew aspects of Doppler imaging in Sun-as-a-star observations
Birmingham Solar Oscillations Network (BiSON) instruments use resonant scattering spectrometers to make unresolved Doppler velocity observations of the Sun. Unresolved measurements are not homogenous across the solar disc and so the observed data do not represent a uniform average over the entire surface. The influence on the inhomogeneity of the solar rotation and limb darkening has been consi...
متن کاملLocalized Helioseismic Constraints on Solar Structure
Localized differences between the real Sun and standard solar models are shown to be small. The sound speeds of the real and the standard model Suns typically differ by less than 0.3% for regions of radial width 30.1 RJ in the solar core. Subject headings: nuclear reactions, nucleosynthesis, abundances — Sun: interior — Sun: oscillations
متن کاملAstrometric Jitter of the Sun as a Star
The daily variation of the solar photocenter over some 11 years is derived from the Mount Wilson data reprocessed by Ulrich et al. 2010 to closely match the surface distribution of solar irradiance. The standard deviations of astrometric jitter are 0.52 μAU and 0.39 μAU in the equatorial and the axial dimensions, respectively. The overall dispersion is strongly correlated with the solar cycle, ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2018
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s174392131800162x