6 papers
Quantifying the effect of passband on observations in the Ca II K line
Ajay Kumar Yadav, Theodosios Chatzistergos, Natalie Krivova +33
Full-disk observations of the Sun in the Ca II K line have been carried out since the late 19th century at various observatories worldwide. These long-term records of solar activit…
Reconstruction of annual solar irradiance over the last three millennia
D. Temaj, N. A. Krivova, S. K. Solanki +2
Solar irradiance measurements are limited to the last few decades, requiring reconstructions to assess solar variability on longer timescales and its impact on Earth's climate. We…
Empirical flare energy limits for the largest historical sunspots
N. A. Krivova, T. Chatzistergos, M. Kazachenko +1
Extreme solar particle events reveal that the Sun can occasionally produce eruptions significantly more energetic than those observed in the modern era. These events are thought to…
Solar Irradiance Reconstruction over the Telescopic Era Using a Revised Photospheric Magnetic Field Model
D. Temaj, N. A. Krivova, T. Chatzistergos +2
The Sun is the primary source of energy for Earth and one of the main external drivers of its climate. Solar irradiance -- the radiative power emitted by the Sun and received at 1-…
Quantifying sunspot group nesting with density-based unsupervised clustering
Nurdan Karapinar, Emre Isik, Natalie A. Krivova +1
Sunspot groups often emerge in spatial-temporal clusters, known as nests or complexes of activity. Quantifying how frequently such nesting occurs is important for understanding the…
Linking Solar Magnetism, Extreme Solar Particle Events and Stellar Superflares
Valeriy Vasilyev, Natalie Krivova, Ilya Usoskin
The magnetic field of the Sun drives a wide range of eruptive phenomena, from small-scale nanoflares to large flares and coronal mass ejections (CMEs). While direct observations of…