69 citations · 210 across the 9 of their papers we have counts for
9 papers
Addition to the Gnevyshev-Ohl rule and prediction of solar cycle 25
Yu. A. Nagovitsyn, V. G. Ivanov
In addition to the Gnevyshev-Ohl rule (GOR), the relation of the odd cycle with the subsequent even one in the 22-year Hale solar cycle was found. It is shown that 3 years before t…
Average annual total sunspot area in the last 410 years: The most probable values and limits of their uncertainties
Yury A. Nagovitsyn, Aleksandra A. Osipova
The aim of this work is to create a long (410 years) series of average annual total sunspot areas AR - physically-based index of sunspot activity. We used telescopic observations o…
The effect of telescope aperture, scattered light, and human vision on early measurements of sunspot and group numbers
Nina V. Karachik, Alexei A. Pevtsov, Yury A. Nagovitsyn
Early telescopic observations of sunspots were conducted with instruments of relatively small aperture. These instruments also suffered from a higher level of scattered light, and…
The ratio between the number of sunspot and the number of sunspot groups
K. Georgieva, A. Kilcik, Yu. Nagovitsyn +1
Data from three solar observatories, Learmonth, Holloman, and San Vito, are used to study the variations in the average number of sunspots per sunspot group. It is found that the d…
About the recalibration of the sunspot record
Katya Georgieva, Ali Kilcik, Yury Nagovitsyn +1
In 2015 the calculation of the International (Zurich) sunspot number was cancelled, and it was replaced by a new "recalibrated" series. A new data series was proposed also for the…
Long-term variations in sunspot magnetic field - area relation
Yury A. Nagovitsyn, Alexei A. Pevtsov, Aleksandra A. Osipova
Using observations of sunspot magnetic field strengths (H) from the Crimean Astrophysical Observatory (CrAO) and area (S) of sunspots from the Kislovodsk Mountain Astronomical Stat…
Solar magnetic fields and terrestrial climate
Katya Georgieva, Yury Nagovitsyn, Boian Kirov
Solar irradiance is considered one of the main natural factors affecting terrestrial climate, and its variations are included in most numerical models estimating the effects of nat…
Small-Scale and Global Dynamos and the Area and Flux Distributions of Active Regions, Sunspot Groups, and Sunspots: A Multi-Database Study
Andrés Muñoz-Jaramillo, Ryan R. Senkpeil, John C. Windmueller +12
In this work we take advantage of eleven different sunspot group, sunspot, and active region databases to characterize the area and flux distributions of photospheric magnetic stru…
Cyclic and Long-term Variation of Sunspot Magnetic Fields
Alexei A. Pevtsov, Luca Bertello, Andrey G. Tlatov +3
Measurements from the Mount Wilson Observatory (MWO) are used to study the long-term variations of sunspot field strengths from 1920 to 1958. Following a modified approach similar…