345 citations · 556 across the 8 of their papers we have counts for
8 papers
Irradiance Variations of the Sun and Sun-Like Stars -- Overview of Topical Collection
Greg Kopp, Alexander Shapiro
This topical collection summarizes recent advances in observing and modeling irradiance variations of the Sun and Sun-like stars, emphasizing the links between surface magnetic fie…
From Solar to Stellar Brightness Variations: The Effect of Metallicity
V. Witzke, A. I. Shapiro, S. K. Solanki +2
Context. Comparison studies of Sun-like stars with the Sun suggest an anomalously low photometric variability of the Sun compared to Sun-like stars with similar magnetic activity.…
Are solar brightness variations faculae- or spot-dominated?
A. I. Shapiro, S. K. Solanki, N. A. Krivova +2
Regular spaceborne measurements have revealed that solar brightness varies on multiple timescales, variations on timescales greater than a day being attributed to surface magnetic…
Correlation of Spectral Solar Irradiance with solar activity as measured by VIRGO
C. Wehrli, W. Schmutz, A. I. Shapiro
Context. The variability of Solar Spectral Irradiance over the rotational period and its trend over the solar activity cycle are important for understanding the Sun-Earth connectio…
Recent variability of the solar spectral irradiance and its impact on climate modelling
I. Ermolli, K. Matthes, T. Dudok de Wit +12
The lack of long and reliable time series of solar spectral irradiance (SSI) measurements makes an accurate quantification of solar contributions to recent climate change difficult…
The place of the Sun among the Sun-like stars
A. I. Shapiro, W. Schmutz, G. Cessateur +1
Context. Monitoring of the photometric and chromospheric HK emission data series of stars similar to the Sun in age and average activity level showed that there is an empirical cor…
Detection of Solar Rotational Variability in the LYRA 190 - 222 nm Spectral Band
A. V. Shapiro, A. I. Shapiro, M. Dominique +4
We analyze the variability of the spectral solar irradiance during the period from 7 January, 2010 until 20 January, 2010 as measured by the Herzberg channel (190-222 nm) of the La…
Eclipses observed by LYRA - a sensitive tool to test the models for the solar irradiance
A. I. Shapiro, W. Schmutz, M. Dominique +1
We analyze the light curves of the recent solar eclipses measured by the Herzberg channel (200-220 nm) of the Large Yield RAdiometer (LYRA) onboard PROBA-2. The measurements allow…