82 citations · 273 across the 7 of their papers we have counts for
7 papers
How faculae and network relate to sunspots, and the implications for solar and stellar brightness variations
K. L. Yeo, S. K. Solanki, N. A. Krivova
How global faculae and network coverage relates to that of sunspots is relevant to the brightness variations of the Sun and Sun-like stars. We extend earlier studies that found the…
Analysis of full disc Ca II K spectroheliograms III. Plage area composite series covering 1892-2019
Theodosios Chatzistergos, Ilaria Ermolli, Natalie A. Krivova +16
We derive the plage area evolution over the last 12 solar cycles employing data from all Ca II K archives available publicly in digital form known to us, including several as yet u…
Effect of metallicity on the detectability of rotational periods in solar-like stars
V. Witzke, T. Reinhold, A. I. Shapiro +2
Accurate determination of stellar rotation periods is important for estimating stellar ages as well as for understanding stellar activity and evolution. While for about thirty thou…
Inflection point in the power spectrum of stellar brightness variations. I. The model
A. I. Shapiro, E. M. Amazo-Gómez, N. A. Krivova +1
Context. Considerable effort has been put into using light curves observed by space telescopes such as CoRoT, Kepler and TESS for determining stellar rotation periods. While rotati…
Analysis of full disc Ca II K spectroheliograms. II. Towards an accurate assessment of long-term variations in plage areas
Theodosios Chatzistergos, Ilaria Ermolli, Natalie A. Krivova +1
Reconstructions of past irradiance variations require suitable data on solar activity. The longest direct proxy is the sunspot number, and it has been most widely employed for this…
The nature of solar brightness variations
A. I. Shapiro, S. K. Solanki, N. A. Krivova +3
The solar brightness varies on timescales from minutes to decades. Determining the sources of such variations, often referred to as solar noise, is of importance for multiple reaso…