174 citations · 737 across the 19 of their papers we have counts for
19 papers
Spectral variability of photospheric radiation due to faculae II: Facular contrasts for cool main-sequence stars
Charlotte M. Norris, Yvonne C. Unruh, Veronika Witzke +5
Magnetic features on the surface of stars, such as spots and faculae, cause stellar spectral variability on time-scales of days and longer. For stars other than the Sun, the spectr…
Solar Irradiance Variability is Caused by the Magnetic Activity on the Solar Surface
K. L. Yeo, S. K. Solanki, C. M. Norris +3
The variation in the radiative output of the Sun, described in terms of solar irradiance, is important to climatology. A common assumption is that solar irradiance variability is d…
Spectral variability of photospheric radiation due to faculae I: The Sun and Sun-like stars
Charlotte M. Norris, Benjamin Beeck, Yvonne C. Unruh +3
Context. Stellar spectral variability on timescales of a day and longer, arising from magnetic surface features such as dark spots and bright faculae, is an important noise source…
Estimates of Active Region Area Coverage through Simultaneous Measurements of He I 5876 and 10830 Lines
V. Andretta, M. S. Giampapa, E. Covino +2
Simultaneous, high-quality measurements of the neutral helium triplet features at 5876~Å and 10830~Å, respectively, in a sample of solar-type stars are presented. The observations…
Radial velocity observations of the 2015 Mar 20 eclipse - A benchmark Rossiter-McLaughlin curve with zero free parameters
Ansgar Reiners, Ulrike Lemke, Florian Bauer +2
On March 20, 2015, we obtained 159 spectra of the Sun as a star with the solar telescope and the FTS at the Institut für Astrophysik Göttingen, 76 spectra were taken during partial…
MESA meets MURaM: Surface effects in main-sequence solar-like oscillators computed using three-dimensional radiation hydrodynamics simulations
W. H. Ball, B. Beeck, R. H. Cameron +1
... [C]urrent stellar models predict oscillation frequencies that are systematically affected by simplified modelling of the near-surface layers. We use three-dimensional radiation…