3 papers
astro-ph.SR2020
Inflection point in the power spectrum of stellar brightness variations III: Faculae vs. Spot dominance on stars with known rotation periods
E. M. Amazo-Gomez, A. I. Shapiro, S. K. Solanki +4
Stellar rotation periods can be determined by observing brightness variations caused by active magnetic regions transiting visible stellar disk as the star rotates. The successful…
astro-ph.SR2020
Rotation periods from the inflection point in the power spectrum of stellar brightness variations: II. The Sun
E. M. Amazo-Gómez, A. I. Shapiro, S. K. Solanki +5
Young and active stars generally have regular, almost sinusoidal, patterns of variability attributed to their rotation, while the majority of older and less active stars, including…
astro-ph.SR2018
Response of solar irradiance to sunspot area variations
T. Dudok de Wit, G. Kopp, A. Shapiro +2
One of the important open questions in solar irradiance studies is whether long-term variability (i.e. on timescales of years and beyond) can be reconstructed by means of models th…