52 citations · 104 across the 8 of their papers we have counts for
4 papers · 1 filter
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…
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…
Solar dynamo and geomagnetic activity
Katya Georgieva, Boian Kirov
The correlation between geomagnetic activity and the sunspot number in the 11-year solar cycle exhibits long-term variations due to the varying time lag between the sunspot-related…