58 citations · 82 across the 3 of their papers we have counts for
4 papers
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…
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…